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Littérature scientifique sur le sujet « Jurassic-Cretaceous »

Auteur : Grafiati

Publié le 8 novembre 2023

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Articles de revues sur le sujet "Jurassic-Cretaceous"

Remane, Jürgen. « Jurassic-Cretaceous boundary ». Geobios 27 (décembre 1994) : 773. http://dx.doi.org/10.1016/s0016-6995(94)80246-7.

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Erdenetsogt, Bat-Orshikh. « Preliminary results of petroleum source rock evaluation of Mongolian Mesozoic oil shales ». Геологийн асуудлууд 15 (23 février 2023) : 46–57. http://dx.doi.org/10.22353/.v15i01.2272.

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Jurassic and Cretaceous oil shale samples, collected from northern and central Mongolian basins, have been analyzed to determine their petroleum source rock potential. The contents of total organic carbon (TOC) and total sulfur, and source rock screening data were obtained by Rock-Eval pyrolysis. Cretaceous oil shales contain up to 17.4 wt.% TOC and Hydrogen Index (HI) values range from 638-957 mg HC/g TOC. Jurassic oil shale samples have similar TOC contents, ranging from 10.7 to 17.3 wt.%. HI values of Jurassic Tsagaan-Ovoo oil shale vary between 270-313 mg HC/g TOC. Average Tmax values of Cretaceous and Jurassic samples are 4370C and 4230C, respectively. This observed data indicates that both Jurassic and Cretaceous oil shales are excellent source rock. Cretaceous oil shales contain type I kerogen (highly oil prone), while Jurassic Tsagaan-Ovoo oil shale has mixed type II/III kerogen (mixed oil and gas prone). Based on Tmax and Production Index values, both Jurassic and Cretaceous oil shales are immature. Overall, the result of this study contributes organic geochemistry database of Mongolian oil shale and encourages source rock potential of both Jurassic and Cretaceous oil shale.

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Yin, Wei. « Hydrocarbon Geology Characteristics and Oil & ; Gas Resource Potential in the Afghan-Tajik Basin ». Advanced Materials Research 734-737 (août 2013) : 366–72. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.366.

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The Afghan-Tajik Basin is an intermontane depression between the mountain ranges of Gissar and Pamirs, and Jurassic system and Tertiary system are rich in large oil & gas resources. In order to assure sustainable supply of oil & gas from Central Asia, we deeply researched hydrocarbon geology characteristics and resource potentials. The basin belongs to paralic sedimentary environment, and develops 3 sedimentary strata: Jurassic, Cretaceous, and Tertiary. Afghan-Tajik Basin develops 3 main source rocks including clastic rocks of Jurassic, carbonate rocks of Cretaceous and mudstone rocks of Eocene. The basin develops 2 plays: Jurassic-Cretaceous play is gas containing one, and Tertiary play is oil containing one. Plaster stone and salt rock of upper Jurassic are regional cap rocks of Jurassic-Cretaceous gas pool, and creaming mudstone and muddy limestone of Cretaceous and Tertiary are regional or partial cap rocks. Migration and accumulation of hydrocarbon occur in the late Cretaceous and early Pliocene epoch. Afghan-Tajik Basin has larger exploration potentials, and residual resources are 2.4¡Á108t. The potential zones are as follows, south part of basin, oil-gas structures of post-salt, reef limestone of pre-salt, and litho-stratigraphic traps.

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Sun, Shou-Liang, Shu-Wang Chen, Zhong-Jie Yang, Tao Zhang, Yong-Fei Li, Ji-Chang Zhu, Huai-Chun Wu, Tian-Tian Wang, Yue-Juan Zheng et Qiu-Hong Ding. « Age of the Tuchengzi Formation in Western Liaoning Province and the Jurassic–Cretaceous Boundary from the Continuous Core Records of Well YD1, Jinyang Basin ». Minerals 12, n^o 8 (28 juillet 2022) : 953. http://dx.doi.org/10.3390/min12080953.

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The Tuchengzi Formation is widely distributed in western Liaoning Province with a clear top and bottom. It is the focal area for the delineation of the terrestrial Jurassic–Cretaceous boundary in China. Based on continuous core samples taken from well YD1, detailed lithostratigraphic sequences and zircon uranium–lead (U-Pb) dating were used to investigate the Tuchengzi Formation. The zircon U-Pb ages of the tuff samples taken from the First and Third Members of the Tuchengzi Formation ranged from 153.8 to 137.16 Ma, indicating that they were formed in the late Middle Jurassic–Early Cretaceous. Dating results from the bottom of the Second Member of the Tuchengzi Formation indicate that the sedimentary time of the stratum is no later than 145.7 ± 2.1 Ma. We concluded that the Jurassic–Cretaceous boundary of the Jinyang Basin in western Liaoning province may be located at the interface at a depth of 464 m in well YD1. This conclusion is consistent with the Jurassic–Cretaceous boundary that has been presumed by other researchers based on paleontological assemblage features found in recent years, and can provide useful geological marker beds for the future study of the terrestrial Jurassic–Cretaceous boundary. In addition, the authors also systematically sorted the potential development areas and layers of the terrestrial Jurassic–Cretaceous boundary line, which may also provide useful geological marker beds for the future study of the terrestrial Jurassic–Cretaceous boundary.

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Mannion, Philip D. « A turiasaurian sauropod dinosaur from the Early Cretaceous Wealden Supergroup of the United Kingdom ». PeerJ 7 (24 janvier 2019) : e6348. http://dx.doi.org/10.7717/peerj.6348.

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The Jurassic/Cretaceous (J/K) boundary, 145 million years ago, has long been recognised as an extinction event or faunal turnover for sauropod dinosaurs, with many ‘basal’ lineages disappearing. However, recently, a number of ‘extinct’ groups have been recognised in the Early Cretaceous, including diplodocids in Gondwana, and non-titanosauriform macronarians in Laurasia. Turiasauria, a clade of non-neosauropod eusauropods, was originally thought to have been restricted to the Late Jurassic of western Europe. However, its distribution has recently been extended to the Late Jurassic of Tanzania (Tendaguria tanzaniensis), as well as to the Early Cretaceous of the USA (Mierasaurus bobyoungi and Moabosaurus utahensis), demonstrating the survival of another ‘basal’ clade across the J/K boundary. Teeth from the Middle Jurassic–Early Cretaceous of western Europe and North Africa have also tentatively been attributed to turiasaurs, whilst recent phylogenetic analyses recovered Late Jurassic taxa from Argentina and China as further members of Turiasauria. Here, an anterior dorsal centrum and neural arch (both NHMUK 1871) from the Early Cretaceous Wealden Supergroup of the UK are described for the first time. NHMUK 1871 shares several synapomorphies with Turiasauria, especially the turiasaurs Moabosaurus and Tendaguria, including: (1) a strongly dorsoventrally compressed centrum; (2) the retention of prominent epipophyses; and (3) an extremely low, non-bifid neural spine. NHMUK 1871 therefore represents the first postcranial evidence for Turiasauria from European deposits of Early Cretaceous age. Although turiasaurs show clear heterodont dentition, only broad, characteristically ‘heart’-shaped teeth can currently be attributed to Turiasauria with confidence. As such, several putative turiasaur occurrences based on isolated teeth from Europe, as well as the Middle Jurassic and Early Cretaceous of Africa, cannot be confidently referred to Turiasauria. Unequivocal evidence for turiasaurs is therefore restricted to the late Middle Jurassic–Early Cretaceous of western Europe, the Late Jurassic of Tanzania, and the late Early Cretaceous of the USA, although remains from elsewhere might ultimately demonstrate that the group had a near-global distribution.

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Bata, Timothy. « Evidences of Widespread Cretaceous Deep Weathering and Its Consequences : A Review ». Earth Science Research 5, n^o 2 (2 mai 2016) : 69. http://dx.doi.org/10.5539/esr.v5n2p69.

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This study highlights the effect of the Cretaceous greenhouse climate on weathering processes. Atmospheric CO2 level was relatively higher in the Cretaceous than it was in both the Jurassic and the Cenozoic. Consequently, temperature and humidity were higher in the Cretaceous than in the Jurassic and the Cenozoic. The interaction among the high levels of atmospheric CO2, extreme global warmth, and humidity in the Cretaceous resulted in widespread deep weathering. Cretaceous palaeo-weathering profiles are observed to occur at higher palaeolatitudes relative to the Jurassic and Cenozoic palaeo-weathering profiles. This implies the upward warming of the Cretaceous palaeolatitude, consistent with palaeotemperature estimates for the Cretaceous. The present thickness of weathering profiles in some selected tropical zones is approximately 200 m. During the greenhouse climatic condition in the Cretaceous, the thickness of weathering profiles at those areas could have been up to 4–5 times the present value. This suggests that many sediments were produced from the Cretaceous weathering events.

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Jacobson, Carl E., César Jacques-Ayala, Andrew P. Barth, Juan Carlos García y Barragán, Jane N. Pedrick et Joseph L. Wooden. « Protolith age of the Altar and Carnero complexes and latest Cretaceous–Miocene deformation in the Caborca–Altar region of northwestern Sonora, Mexico ». Revista Mexicana de Ciencias Geológicas 36, n^o 1 (27 mars 2019) : 95–109. http://dx.doi.org/10.22201/cgeo.20072902e.2019.1.784.

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In the Caborca–Altar area of northwest Sonora, variably deformed and metamorphosed sedimentary and volcanic rocks crop out in a northwest-southeast–trending belt (El Batamote belt) at least 70 km long. We obtained detrital zircon U-Pb ages from two distinctive components of the belt near Altar, here termed the Altar complex and Carnero complex. Zircon ages for metasandstone and metaconglomerate matrix from the Altar complex indicate a Late Cretaceous maximum age of sedimentation, with at least part of the complex no older than 77.5 ± 2.5 (2σ). Pre-Cretaceous detrital zircons in the complex were derived largely from local sources, including Proterozoic basement, the Neoproterozoic–Cambrian miogeocline and the Jurassic arc. The detrital zircon ages and lithologic character of the Altar complex suggest correlation with the Escalante Formation, the uppermost unit of the Upper Cretaceous El Chanate Group. In contrast, one sample from the Carnero complex yielded a Middle Jurassic maximum depositional age and a detrital zircon age distribution like that of the Jurassic eolianites of the North American Cordillera. The Carnero complex may correlate with the Middle Jurassic Rancho San Martín Formation but could also be a metamorphosed equivalent of the Upper Jurassic Cucurpe Formation, Upper Jurassic to Lower Cretaceous Bisbee Group, or El Chanate Group derived by recycling of Jurassic erg sandstones. The Late Cretaceous age for the Altar complex protolith contradicts models that relate deposition of the entire El Batamote protolith to a basin formed by oblique slip along the Late Jurassic Mojave-Sonora megashear. Instead, the belt is best explained as an assemblage of Middle Jurassic to Upper Cretaceous formations deformed and locally metamorphosed beneath a northeast-directed Laramide thrust complex. Potassium-argon and 40Ar/39Ar ages confirm previous inferences that deformation of El Batamote belt occurred between the Late Cretaceous and late Eocene. A second phase of deformation, involving low-angle normal faults, occurred during and/or after intrusion of the ~22-21 Ma Rancho Herradura granodiorite.

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Egebjerg Mogensen, Tommy, et John A. Korstgård. « Triassic and Jurassic transtension along part of the Sorgenfrei–Tornquist Zone in the Danish Kattegat ». Geological Survey of Denmark and Greenland (GEUS) Bulletin 1 (28 octobre 2003) : 437–58. http://dx.doi.org/10.34194/geusb.v1.4680.

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In the Kattegat area, Denmark, the Sorgenfrei–Tornquist Zone, an old crustal weakness zone, was repeatedly reactivated during Triassic, Jurassic and Early Cretaceous times with dextral transtensional movements along the major boundary faults. These tectonic events were minor compared to the tectonic events of the Late Carboniferous – Early Permian and the Late Cretaceous – Early Tertiary, although a dynamic structural and stratigraphic analysis indicates that the Sorgenfrei–Tornquist Zone was active compared to the surrounding areas. At the end of the Palaeozoic, the area was a peneplain. Regional Triassic subsidence caused onlap towards the north-east, where the youngest Triassic sediments overlie Precambrian crystalline basement. During the Early Triassic, several of the major Early Permian faults were reactivated, probably with dextral strike-slip along the Børglum Fault. Jurassic – Early Cretaceous subsidence was restricted primarily to the area between the two main faults in the Sorgenfrei–Tornquist Zone, the Grenå–Helsingborg Fault and the Børglum Fault. This restriction of basin development indicates a change in the regional stress field at the Triassic–Jurassic transition. Middle Jurassic and Late Jurassic – Early Cretaceous subsidence followed the Early Jurassic pattern with local subsidence in the Sorgenfrei–Tornquist Zone, but now even more restricted to within the zone. The subsidence showed a decrease in the Middle Jurassic, and increased again during Late Jurassic – Early Cretaceous times. Small faults were generated internally in the Sorgenfrei–Tornquist Zone during the Mesozoic with a pattern that indicates a broad transfer of strike-slip/oblique-slip motion from the Grenå–Helsingborg Fault to the Børglum Fault.

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Ellis, G. K., A. Pitchford et R. H. Bruce. « BARROW ISLAND OIL FIELD ». APPEA Journal 39, n^o 1 (1999) : 158. http://dx.doi.org/10.1071/aj98011.

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The Barrow Island Field in the Barrow Sub-basin of the Carnarvon Basin was discovered in 1964 by West Australian Petroleum Pty Limited. It is the largest oil field in Western Australia. Appraisal drilling has defined in-place oil of 200 GL (1,250 MMBBL) and in-place gas of 16.5 Gm3 (580 BCF) primarily in the Lower Cretaceous Windalia Sand Member of the Muderong Shale and in- place gas of 14.5 Gm3 (515 BCF) in Middle Jurassic Biggada Formation. Additional hydrocarbon reservoirs have been discovered, including oil and gas in the Upper Jurassic Dupuy Formation, the Lower Cretaceous Malouet Formation, Flacourt Formation and Tunney Member, Mardie Greensand Member and M zones of the Muderong Shale and in the Upper Cretaceous Gearle Siltstone. Approximately 850 wells have been drilled to appraise and develop these accumulations, and to provide water source and water injection wells to enhance recovery. Production commenced in December 1966, with the first shipment of oil in April 1967. Although numerous hydrocarbon reservoirs have been developed, 95% of the 44 GL (278 MMBBL) of produced oil has been from the Windalia Sand.Structural development of the Barrow Island anticline occurred initially during the Middle Jurassic and continued intermittently during the Cretaceous and Tertiary. Initial charging of the Dupuy and Malouet formations with oil from the Upper Jurassic Dingo Claystone occurred in the Early Cretaceous prior to the development of the shallower closures. Periodic wrench- related movement on the Barrow Fault during the Early to Late Cretaceous produced closures at the Lower Cretaceous reservoirs and provided a catalyst for oil migration and charging of these closures. Significant amounts of an extremely biodegraded component, and several less biodegraded phases are present in the oil in the Windalia Sand, indicating several phases of oil charging of the Barrow structure from Middle and Upper Jurassic sediments. In the Tertiary, gas sourced from Triassic and Jurassic sediments migrated into the Barrow structure via a dilated Barrow Fault, charged the Middle Jurassic Biggada Formation and displaced some of the oil in the Lower Cretaceous reservoirs.

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Zhimulev, F. I., E. V. Vetrov, I. S. Novikov, G. Van Ranst, S. Nachtergaele, S. A. Dokashenko et J. De Grave. « Mesozoic Intracontinental Orogeny in the Tectonic History of the Kolyvan’– Tomsk Folded Zone (Southern Siberia) : a Synthesis of Geological Data and results of Apatite Fission Track Analysis ». Russian Geology and Geophysics 62, n^o 9 (1 septembre 2021) : 1006–20. http://dx.doi.org/10.2113/rgg20204172.

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Abstract —The Kolyvan’–Tomsk folded zone (KTFZ) is a late Permian collisional orogen in the northwestern section of the Central Asian Orogenic Belt. The Mesozoic history of the KTFZ area includes Late Triassic–Early Jurassic and Late Jurassic–Early Cretaceous orogenic events. The earlier event produced narrow deep half-ramp basins filled with Early–Middle Jurassic molasse south of the KTFZ, and the later activity rejuvenated the Tomsk thrust fault, whereby the KTFZ Paleozoic rocks were thrust over the Early–Middle Jurassic basin sediments. The Mesozoic orogenic events induced erosion and the ensuing exposure of granitoids (Barlak complex) that were emplaced in a within-plate context after the Permian collisional orogeny. Both events were most likely associated with ocean closure, i.e., the Paleothetys Ocean in the Late Triassic–Early Jurassic and the Mongol–Okhotsk Ocean in the Late Jurassic–Early Cretaceous. The apatite fission track (AFT) ages of granitoids from the Ob’ complex in the KTFZ range between ~120 and 100 Ma (the Aptian and the Albian). The rocks with Early Cretaceous AFT ages were exhumed as a result of denudation and peneplanation of the Early Cretaceous orogeny, which produced a vast Late Cretaceous–Paleogene planation surface. The tectonic pattern of the two orogenic events, although being different in details, generally inherited the late Paleozoic primary collisional structure of the Kolyvan’–Tomsk zone.

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Thèses sur le sujet "Jurassic-Cretaceous"

Woodfine, Richard Gareth. « Chemostratigraphy of Jurassic-cretaceous Italian carbonate platforms ». Thesis, University of Oxford, 2002. http://ora.ox.ac.uk/objects/uuid:03c84d34-a27d-46fd-89b0-d69a1501d888.

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Samples of shallow-water carbonates were collected from Jurassic and Cretaceous Italian carbonate platforms and subjected to petrographic, diagenetic and chemostratigraphic analyses (⁸⁷Sr/⁸⁶Sr, δ¹³C_carb, δ¹³C_org, δ¹⁸O). In general, the new chemostratigraphic data generated reflect trends established by previous work, some of which has been carried out on biostratigraphically calibrated reference sections. Consequently, chemostratigraphic correlations (⁸⁷Sr/⁸⁶Sr, δ¹³C_carb) of isotope profiles taken from platform carbonates with well-dated reference sections have allowed the application of high-resolution dating frameworks to the biostratigraphically poorly constrained carbonate platforms. The increased resolution in dating of the Italian carbonate platforms has, furthermore allowed a detailed investigation into the facies response of these carbonate platforms to major geological events. In particular, platform responses to oceanic anoxic events and other periods of major perturbation in the global carbon cycle are analysed (early Toarcian, Aalenian-Bajocian, Oxfordian-Tithonian, Valanginian-Hauterivian, Aptian-Albian, Cenomanian-Turonian, Coniacian-Santonian). Lower Jurassic levels of the Trento Platform record platform devastation in the early Toarcian synchronous with a major negative δ¹³C_carb excursion, followed by platform recovery synchronous with a pronounced δ¹³C_carb positive excursion and return to background values. The Campania-Lucania Platform shows negligible response to the oceanographic events of the early Toarcian even though the characteristic carbon-isotope profile is readily identifiable. The Trento Platform drowned at approximately the Aalenian-Bajocian Stage boundary, synchronously with a reproducible negative followed by positive δ¹³C_carb excursion, whereas the Campania-Lucania Platform underwent a facies transition from oolite to cyclically bedded micrite. The Friuli Platform showed negligible depositional response to the carbon-cycle perturbations of the Kimmeridgian-Tithonian, Valanginian-Hauterivian, Aptian-Albian and Cenomanian- Santonian (as registered in the δ¹³C_carb record). The Campania-Lucania Platform registered flooding and increased levels of organic-matter preservation coincident with pronounced positive δ¹³C_carb excursions at Cenomanian-Turonian and Coniacian-Santonian levels. Observations on the responses of carbonate platforms to oceanographic conditions during periods of global carbon burial lead to the conclusion that temperature excess is a hitherto neglected control on global carbonate accumulation rates.

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Jones, Charles Edward. « Strontium isotopes in Jurassic and Early Cretaceous seawater ». Thesis, University of Oxford, 1992. http://ora.ox.ac.uk/objects/uuid:fe3733bd-8e31-4bba-a78b-6d8275a0075f.

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The collection and analysis of a large number of belemnites and oysters with excellent biostratigraphic and diagenetic control has resulted in a highly detailed determination of the seawater Sr-isotope curve through the Jurassic and Early Cretaceous. The new data confirm the broad trends established by previous work, but the much sharper resolution of the new data allows the application of Sr-isotope stratigraphy with an optimal stratigraphic resolution of ± 1 to 4 ammonite subzones (± 0.5 to 2 Ma). The data show a general decline from the Hettangian (Early Jurassic) to a minimum in the Callovian and Oxfordian (Middle/Late Jurassic). This is followed by an increase through the Kimmeridgian (Late Jurassic) to a plateau reached in the Barremian (Early Cretaceous). In addition, there are major negative excursions in the Pliensbachian/Toarcian (Early Jurassic) and Aptian/Albian (Early Cretaceous). Stable isotope data collected from belemnites and oysters have resulted in the most extensive Jurassic δ¹³C and δ¹⁸O database to date. While both the carbon and oxygen data appear to give reasonable marine signals, the scatter in the data suggests that future research must document possible biological fractionation effects and develop better indicators for the diagenetic alteration of 613C and 6i 8O. The final chapter documents an unexpected correlation between sudden shifts in the Sr-isotope curve, the occurrence of positive 513C excursions, and the eruption of flood basalts. In the Jurassic and Cretaceous there is a correlation in time between sudden downward shifts in the Sr-isotope curve (Pliensbachian, Aptian, Cenomanian/Turonian), the occurance of positive 613C excursions, and the eruption of flood basalts. Each of these major downward shifts in the Sr-isotope curve is followed by a sudden upward shift, which although associated with a positive 613C excursion is not associated with an episode of flood basalt volcanism. In the Cenozoic the Sr-isotope curve no longer displays downward shifts, but the correlation continues between the occurrence of flood basalts and positive 513C excursions. Several lines of evidence suggest that the eruption of flood basalts is associated with pulses of hydrothermal activity, and that this hydrothermal activity brings about the conditions necessary for the genesis of carbon-burial events.

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Tennant, Jonathan. « The Jurassic/Cretaceous boundary : a hidden mass extinction in tetrapods ? » Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/44179.

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Reconstructing deep time trends in biodiversity remains a central goal for palaeobiologists, but our understanding of the magnitude and tempo of extinctions and radiations is confounded by uneven sampling of the fossil record. In particular, the Jurassic/Cretaceous (J/K) boundary, 145 million years ago, remains poorly understood. By applying a range of techniques for assessing changes in diversity, I demonstrate that both marine and non-marine tetrapod faunas show evidence for a protracted period of regional and global ecological and taxonomic reorganisation across the J/K boundary. Although much of the signal is exclusively European, almost every higher tetrapod group was affected by a substantial decline across the boundary, culminating in the extinction of several important clades and the ecological release and radiation of numerous modern tetrapod groups, including amphibians, birds and sharks. Groups such as pterosaurs and sauropods began their decline before the J/K boundary, whereas others (including mammaliaforms and ornithischians) did not appear to be affected at the J/K boundary, but declined subsequently in the earliest Cretaceous. However, the majority of clades document their greatest magnitude of decline through the Jurassic-Cretaceous boundary, indicating that the overall extinction tempo was staggered and occurred in a 'wave' through the J/K transition. These major shifts in tetrapod diversity are shown to be independent of both global and regional sampling proxies, except for the North American record for which evidence of the common cause hypothesis is strong. Variation in eustatic sea level was the primary driver of these patterns, controlling biodiversity through availability of shallow marine environments and via allopatric speciation on land. I further investigated the systematics of Atoposauridae, poorly known group of highly-specialised crocodyliforms that appear to have crossed through the J/K boundary. A detailed revision of their taxonomy and systematics indicates that they went extinct at the J/K boundary.

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Currie, Brian Scott 1966. « Jurassic-Cretaceous evolution of the central Cordilleran foreland-basin system ». Diss., The University of Arizona, 1998. http://hdl.handle.net/10150/282582.

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During Jurassic and Cretaceous time deposition in the western interior basin was controlled by a combination of subduction-related dynamic subsidence and thrust-generated flexural subsidence. Changes in the angle of oceanic plate subduction along the western margin of North America and thrust deformation in the Cordillera governed the spatial and temporal influences of these mechanisms throughout basin history. Dynamic subsidence was the primary control on basin deposition during Early-Middle Jurassic and Late Cretaceous time. During these periods, shallow-angle oceanic plate subduction beneath the western margin of North America produced convective mantle circulation and long wavelength subsidence in the western interior. A cessation of dynamic subsidence during Early Cretaceous time, brought on by an increase in the angle of subduction, is partially responsible for the ∼20 m.y. unconformity that separates the Jurassic and Cretaceous sequences in the western interior. During Late Jurassic time, thrusting in the Cordillera resulted in flexural partitioning of the back-arc region. Statal geometries in the Upper Jurassic Morrison Formation in Utah and Colorado indicate deposition in the back-bulge and forebulge depozones of the Late Jurassic foreland basin system and suggest the coeval existence of a flexurally subsiding foredeep to the west. During Early Cretaceous time, >200 km of shortening in the thrust belt resulted in uplift and erosion of the Late Jurassic foredeep and the eastward migration of foreland-basin system flexural components. Areas occupied by the Late Jurassic forebulge were incorporated into the Early Cretaceous foredeep while the Late Jurassic back-bulge depozone became the location of the Early Cretaceous forebulge. In eastern Utah and western Colorado, migration of the forebulge enhanced the regional Early Cretaceous unconformity associated with the cessation of dynamic subsidence. During late Early Cretaceous time sediment accumulation across the entire foreland-basin system may have been facilitated by the reinitiation of dynamic subsidence in the western interior. During the Late Cretaceous, thrusting in the Cordillera resulted in continued flexural subsidence of the foredeep in east-central Utah. However, increased dynamic subsidence throughout Late Cretaceous time allowed thick accumulations of strata to be deposited in the forebulge and back-bulge depozones of the foreland-basin system.

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Ceglar, Nathan. « Late Jurassic to Early Cretaceous sequence stratigraphy, Northern Bonaparte Basin, Timor Sea / ». Title page, contents and abstract only, 1999. http://web4.library.adelaide.edu.au/theses/09SB/09sbc389.pdf.

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Groecke, Darren Richard. « Isotope stratigraphy and ocean-atmosphere interactions in the Jurassic and Early Cretaceous ». Thesis, University of Oxford, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393117.

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Smith, Giles A. « Palynology of the Jurassic/Cretaceous boundary interval in the Volga Basin, Russia ». Thesis, University of Bristol, 1999. http://hdl.handle.net/1983/a981fc30-fa69-4cf5-aae5-7290d2a489df.

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Lott, Graham Keith. « Late Triassic, Jurassic and Early Cretaceous geology of the Southern North Sea Basin ». Thesis, University of Leicester, 1985. http://hdl.handle.net/2381/8430.

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The primary aim of this thesis is to provide a comprehensive assessment of the geology of the Southern North Sea Basin during the Jurassic and Early Cretaceous. In order to achieve this the integration of a wide variety of data has been undertaken, including the interpretation of shallow seismic profiles, downhole geophysical log correlation and petrographic descriptions of all available core and seabed sample information from the offshore area. A number of onshore cored borehole sequences were examined in some detail to establish some control points with which to compare the largely uncored offshore successions. [Taken from the thesis Introduction]

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Moreno, Karen. « Jurassic - Cretaceous dinosaur footprints from South America and pedal biomechanics in ornithopod dinosaurs ». Thesis, University of Bristol, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.424417.

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Reis, Jonathan Hunter. « Jurassic and Cretaceous tectonic evolution of the southeast Castle Dome Mountains, southwest Arizona ». [Ames, Iowa : Iowa State University], 2009.

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Livres sur le sujet "Jurassic-Cretaceous"

H, Bate R., Wilkinson I. P, Thames Polytechnic. School of Earth Sciences. et British Micropalaeontological Society, dir. The Jurassic and Cretaceous of Eastern England. [London] : Thames Polytechnic, 1988.

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J, Hoedemaeker Ph. Correlation possibilities around the Jurassic/Cretaceous boundary. Leiden : Rijksmuseum van Geologie en Mineralogie, 1987.

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Steuber, Thomas. Jurassic-Cretaceous Rudists (Mollusca, Hippuritacea) : Bibliography 1758-1994. Dresden : CPress, 1996.

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Rees, Jan. Jurassic and Early Cretaceous selachians--focus on southern Scandinavia. Lund, Sweden : Lund University, 2001.

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Jurassic and Cretaceous floras and climates of the earth. Cambridge : Cambridge University Press, 1991.

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Howlett, P. J. Late Jurassic-early Cretaceous cephalopods of eastern Alexander Island, Antarctica. London : Palaeontological Association, 1989.

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Howlett, P. J. Late Jurassic-early Cretaceous cephalopods of eastern Alexander Island, Antarctica. London : Palaeontological Association, 1989.

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Challinor, A. B. Jurassic and Cretaceous Belemnitida of Misool archipelago, Irian Jaya, Indonesia. Bandung, Indonesia : Republic of Indonesia, Ministry of Mines and Energy, Directorate General of Geology and Mineral Resources, Geological Research and Development Centre, 1989.

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Feldthusen, Jensen Thorkild, dir. Jurassic-Lower Cretaceous lithostratigraphic nomenclature for the Danish Central Trough. København : I kommission hos C.A. Reitzels forlag, 1986.

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Howlett, P. J. Late Jurassic-early Cretaceous cephalopods of Eastern Alexander Island, Antarctica. London : Palaeontological Association, 1989.

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Plus de sources

Chapitres de livres sur le sujet "Jurassic-Cretaceous"

Martín-Chivelet, Javier, José López-Gómez, Roque Aguado, Consuelo Arias, José Arribas, María Eugenia Arribas, Marcos Aurell et al. « The Late Jurassic–Early Cretaceous Rifting ». Dans The Geology of Iberia : A Geodynamic Approach, 169–249. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-11295-0_5.

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Yacobucci, Margaret M. « Macroevolution and Paleobiogeography of Jurassic-Cretaceous Ammonoids ». Dans Topics in Geobiology, 189–228. Dordrecht : Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-9633-0_8.

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Frazier, William J., et David R. Schwimmer. « The Zuni Sequence : Middle Jurassic—Upper Cretaceous ». Dans Regional Stratigraphy of North America, 393–522. Boston, MA : Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1795-1_8.

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Naqi, Mohammad, Ohood Alsalem, Suad Qabazard et Fowzia Abdullah. « Petroleum Geology of Kuwait ». Dans The Geology of Kuwait, 117–44. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-16727-0_6.

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AbstractKuwait has proven conventional oil reserves of about 100 billion barrels which makes it one of the major oil-producing countries worldwide. Most of this reserve is found in Cretaceous and Jurassic with minor quantities in the Paleogene sedimentary successions. Most hydrocarbon production comes from the siliciclastic Burgan Formation which is the most important reservoir in Kuwait. The Jurassic and Lower Cretaceous exhibit good quality source rocks that charged most of the hydrocarbon reservoirs in Kuwait and entered the oil window in Late Cretaceous to Eocene. Most of the hydrocarbon is trapped in very gentle four-way closure structures that are related to the deep-seated fault system of the Arabian Peninsula such as Khurais-Burgan Anticline. Hydrocarbon reservoirs in Kuwait are sealed and capped mainly by shale rocks and to a less extent by evaporites. In the last 15 years, Kuwait Oil Company (KOC) displayed interest in commercially exploiting unconventional hydrocarbon reserves and started laying significant emphasis on the exploration and development of unconventional resources. The aim of this work is to summarize the different petroleum systems of Kuwait including the Paleozoic, Mesozoic, and Cenozoic systems.

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Ren, Dong. « Jurassic-Cretaceous Non-Marine Stratigraphy and Entomofaunas in Northern China ». Dans Rhythms of Insect Evolution, 1–16. Chichester, UK : John Wiley & Sons, Ltd, 2019. http://dx.doi.org/10.1002/9781119427957.ch1.

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Iglesia Llanos, María Paula, et Diego A. Kietzmann. « Magnetostratigraphy of the Jurassic Through Lower Cretaceous in the Neuquén Basin ». Dans Opening and Closure of the Neuquén Basin in the Southern Andes, 175–210. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-29680-3_8.

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Shipley, Thomas H., Lewis J. Abrams, Yves Lancelot et Roger L. Larson. « Late Jurassic-Early Cretaceous oceanic crust and early cretaceous volcanic sequences of the Nauru basin, western Pacific ». Dans The Mesozoic Pacific : Geology, Tectonics, and Volcanism : A Volume in Memory of Sy Schlanger, 103–19. Washington, D. C. : American Geophysical Union, 1993. http://dx.doi.org/10.1029/gm077p0103.

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Salminen, Johanna, Jorge Dinis et Octávio Mateus. « Preliminary Magnetostratigraphy for the Jurassic–Cretaceous Transition in Porto da Calada, Portugal ». Dans Springer Geology, 873–77. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04364-7_165.

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Nagy, Jenö, Magne Löfaldli, Sven A. Bäckström et Halvor Johansen. « Agglutinated Foraminiferal Stratigraphy of Middle Jurassic to Basal Cretaceous Shales, Central Spitsbergen ». Dans Paleoecology, Biostratigraphy, Paleoceanography and Taxonomy of Agglutinated Foraminifera, 969–1015. Dordrecht : Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-011-3350-0_38.

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Li, Jianguo. « Upper Jurassic and Lower Cretaceous Palynological Successions in the Qinghai-Xizang Plateau, China ». Dans Springer Geology, 1197–202. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04364-7_229.

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Actes de conférences sur le sujet "Jurassic-Cretaceous"

Pilskog, B., C. K. Siversen et H. Emami. « Earliest Cretaceous-Late Jurassic of southern Rovuma Basin ». Dans Third EAGE Eastern Africa Petroleum Geoscience Forum. Netherlands : EAGE Publications BV, 2017. http://dx.doi.org/10.3997/2214-4609.201702408.

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Trümpy, Daniel, Jan Witte, Immanuel Weber et João P. Da Ponte Souza. « Source Rocks of Somalia – A Regional Assessment ». Dans SPE/AAPG Africa Energy and Technology Conference. SPE, 2016. http://dx.doi.org/10.2118/afrc-2582343-ms.

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ABSTRACT In total, some 60 wells have been drilled onshore and less than 10 offshore Somalia*, none of which in deep water. Several prospective basins remain undrilled, such as the offshore Jubba and Mid Somali High basins and the onshore Odewayne basin. In view of the gas discoveries offshore Mozambique and Tanzania, and also of encouraging results offshore Kenya (sub-commercial oil discovery Sunbird-1) and in Madagascar, the Somalian offshore and onshore basins were re-evaluated. As to the Somali onshore basins, the extension of the Yemeni Jurassic and Cretaceous rifts into Somalia highlights their prospectivity. Seeps abound (Odewayne and Nogal basins) and some wells encountered good shows. Late Jurassic and Upper Cretaceous marine shales are source rock candidates. Gas in the area of Mogadishu may be associated with the Early Triassic Bokh Fm. source rock. Seeps in western Somalia are rare, and may result either from long-distance migration out of the Calub Graben or from locally mature Lower Cretaceous or Upper Jurassic. We establish an inventory of proven and possible source rock occurences in Somalia by integrating publicly available data on slicks and seeps, geological and gravity maps, literature data, well data and geological information from adjoining basins. Our data indicate that in the Somali part of the Gulf of Aden, high heat-flow may critically affect the Late Jurassic source rock. However, Late Cretaceous or even Eocene sources may be locally oil-mature. The presence of source rocks on the Somali Indian Ocean margin remains presently speculative. Abundance of slicks in the area south of Mogadishu may not relate to hydrocarbons. Of more interest are reported isolated slicks further to the north, in deeper waters of the Mogadishu and Mid-Somalia High Basins. These slicks may be related to Lower/Mid-Jurassic, Late Jurassic, Late Cretaceous or Eocene sources. Analysis of onshore seeps in northern Somalia (Nogal, Daroor, Odewayne basins), integrated with seismic data, will allow to determine the origin of these oils and an assessment of the size of prospective kitchen areas. In the offshore, 3D-Basin-modelling will be required to determine which areas are prospective for gas or, especially, for oil.

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Qin, Guosheng, et Youjing Wang. « Jurassic Hydrocarbon System Appraisal and Implications for Prospectively in Central and Southern Iraq, Middle East ». Dans ADIPEC. SPE, 2023. http://dx.doi.org/10.2118/216182-ms.

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The Jurassic hydrocarbon system in Middle East is one of the world's most important systems with several giant oilfields are discovered in Abu Dhabi, Saudi Arabia, etc[1–3]. The oil and gas discoveries of Jurassic formation are located in the northern part (Fig. 1). Such as the Najmah, Atrush, and Miran West oilfield in north Iraq. Meanwhile, it also considered the main producing reservoirs big reserve in adjacent countries. However, central and southern Iraq is an underexplored area due to large burial depth and limited data. Several wells have confirmed its huge potential. The appraisal of stratigraphy sequence, sedimentation and hydrocarbon assemblages is of great significance to understand prospectively in this region. It also shed light on the exploration of Jurassic formation and deeper formations. The Jurassic contact with the lower Triassic (Kurra Chine) and upper Cretaceous (Sulaiy) in unconformity in southeastern Iraq. The contact surface often characterized by sharp lithological change[3]. For example, the Gotnia formation in top of Jurassic characterized by evaporate lithology (anhydrite and salt). However the Sulaiy formation in the bottom of Cretaceous characterized by mudstone. The Jurassic in Iraq can be further divided into lower Jurassic, middle Jurassic and upper Jurassic (Fig. 1). The lower Jurassic belongs to evaporate and carbonate ramp environment, the lithology dominated by anhydrite and dolomite. The middle Jurassic belongs to intra-shelf environment and the lithology dominated by mudstone and shale. The upper Jurassic belong to shelf and evaporate environment and the lithology dominated by mudstone and anhydrite[4–6].

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« Mesozoic Tectonic Setting of SE Sundaland After Magmatism and Suture Evidences in JS-1 Ridge Area ». Dans Indonesian Petroleum Association 44th Annual Convention and Exhibition. Indonesian Petroleum Association, 2021. http://dx.doi.org/10.29118/ipa21-g-14.

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Mesozoic plate convergence in SE Sundaland has been a source of debate for decades. A determination of plate convergence boundaries and timing have been explained in many publications, but not all boundaries were associated with magmatism. Through integration of both plate configurations and magmatic deposits, the basement can be accurately characterized over time and areal extents. This paper will discuss Cretaceous subductions and magmatic arc trends in SE Sundaland area with additional evidence found in JS-1 Ridge. At least three subduction trends are captured during the Mesozoic in the study area: 1) Early Jurassic – Early Cretaceous trend of Meratus, 2) Early Cretaceous trend of Bantimala and 3) Late Cretaceous trend in the southernmost study area. The Early Jurassic – Early Cretaceous subduction occurred along the South and East boundary of Sundaland (SW Borneo terrane) and passes through the Meratus area. The Early Cretaceous subduction occurred along South and East boundary of Sundaland (SW Borneo and Paternoster terranes) and pass through the Bantimala area. The Late Cretaceous subduction occurred along South and East boundary of Sundaland (SW Borneo, Paternoster and SE Java – South Sulawesi terranes), but is slightly shifted to the South approaching the Oligocene – Recent subduction zone. Magmatic arc trends can also be generally grouped into three periods, with each period corresponds to the subduction processes at the time. The first magmatic arc (Early Jurassic – Early Cretaceous) is present in core of SW Borneo terrane and partly produces the Schwaner Magmatism. The second Cretaceous magmatic arc (Early Cretaceous) trend is present in the SW Borneo terrane but is slightly shifted southeastward It is responsible for magmatism in North Java offshore, northern JS-1 Ridge and Meratus areas. The third magmatic arc trend is formed by Late Cretaceous volcanic rocks in Luk Ulo, the southern JS-1 Ridge and the eastern Makassar Strait areas. These all occur during the same time within the Cretaceous magmatic arc. Though a mélange rock sample has not been found in JS-1 Ridge area, there is evidence of an accretionary prism in the area as evidenced by the geometry observed on a new 3D seismic dataset. Based on the structural trend of Meratus (NNE-SSW) coupled with the regional plate boundary understanding, this suggests that both Meratus & JS-1 Ridge are part of the same suture zone between SW Borneo and Paternoster terranes. The gradual age transition observed in the JS-1 Ridge area suggests a southward shift of the magmatic arc during Early Cretaceous to Late Cretaceous times.

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Vallejo, Cristian, Christian Romero, Brian K. Horton et Janeth Gaibor. « JURASSIC TO EARLY CRETACEOUS TECTONOSTRATIGRAPHIC EVOLUTION OF EASTERN ECUADOR ». Dans GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-341140.

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Galieva, M. F. « MODELS OF THE PALEOZOIC AND THE MESOZOIC FOCI OF HYDROCARBON GENERATION : ROLE IN FORMATION OF THE PRE-JURASSIC DEPOSITS WITHIN THE GERASIMOV FIELD (TOMSK REGION) ». Dans All-Russian Youth Scientific Conference with the Participation of Foreign Scientists Trofimuk Readings - 2021. Novosibirsk State University, 2021. http://dx.doi.org/10.25205/978-5-4437-1251-2-193-195.

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This paper shows results of coupled paleotemperature modelling of sedimentary basins: «present» Jurassic-Cretaceous basin and Paleozoic «paleobasins» by an example of a section of well 12 belongs to the Gerasimov field within Tomsk Region. It is stated that Jurassic (Bazhenov) oil source and Paleozoic (Kehoreg) gas source are co-generating (by time of gen-eration, accumulation and conservation) for the reservoir of Inner Paleozoic.

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Sun, Ziming. « Structural Inversion, Reactivation and Extensional Detachment and Their Influence on the Formation and Preservation of Hydrocarbon Accumulations in Northern Western Desert of Egypt ». Dans SPE/AAPG Africa Energy and Technology Conference. SPE, 2016. http://dx.doi.org/10.2118/afrc-2567052-ms.

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ABSTRACT The northern Western Desert Basins of Egypt experienced a complex evolutionary history and several transformation of tectonic stress field properties. An integrated analysis of geological and geophysical data reveals that structural inversion, reactivation and extensional detachment develop in the area, and have a significant effect on formation and preservation of hydrocarbon accumulations. Such an analysis is paramount for prospect evaluation, risk mitigation, and therefore improving the exploration success rate. The rifting in Jurassic and early Cretaceous formed several faulted-depression basins with boundary normal faults in the area. A few boundary normal faults were reactivated in late Cretaceous to Eocene period as reverse faults with dextral compressive features, giving birth to a series of inverted anticlines over them. Compressive wrenching movement on the boundary faults greatly weakened their lateral sealing capacity and accordingly enhanced the vertical conduit capacity of hydrocarbon migration from the Jurassic source kitchen to Cretaceous inverted anticlines along the boundary faults. This is why Cretaceous inverted anticlines show a high concentration of hydrocarbon accumulations whereas there are few oil discoveries in the lower Alam El Bueib (AEB) formation and Jurassic along the boundary faults. Reactivation of basin boundary normal faults in late Tertiary to present abounds in the area. Most of them are surface penetrating, which are vital to the existing hydrocarbon accumulations because the reactivation could not only make poor the preservation of the existing hydrocarbon accumulations and cause the redistribution of hydrocarbons, but also it would destroy the existing hydrocarbon accumulations. Some unsuccessful wells can be attributed to the reactivation of basin boundary normal faults in late Tertiary to present. Some prospects associated with the reactivation of basin boundary normal faults have the same or similar hydrocarbon preservation risks as the unsuccessful wells. By integrating seismic interpretation and lithologic assemblage and thickness variation of the AEB formation, an extensional detachment fault was recognized in Alamein Basin. The detachment, located in the mudstone-dominated AEB 5-6 intervals, makes hydrocarbon migration difficult from Jurassic source kitchen to Cretaceous traps because the vertical migration pathways have been cut off by it, and are unfavorable for the formation of hydrocarbon accumulation above it.

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Gradstein, Felix M., David K. Watkins, David K. Watkins, David K. Watkins, Henrik Friis, Henrik Friis et Henrik Friis. « PLANKTONIC MICROFOSSIL EVOLUTION AND BIOSTRATIGRAPHY ACROSS THE JURASSIC-CRETACEOUS BOUNDARY ». Dans GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-315472.

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van Laer, P., P. Nederlof, S. A. Ahsan et F. Al Katheeri. « Northern Rub' Al-Khali Upper Jurassic – Lower Cretaceous Petroleum System ». Dans Fourth Arabian Plate Geology Workshop. Netherlands : EAGE Publications BV, 2012. http://dx.doi.org/10.3997/2214-4609.20142779.

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Grabowski, G. J., D. E. Sherrett, T. W. Jones, W. B. Maze et J. Kendall. « Middle Jurassic to Early Cretaceous Petroleum Systems of the Arabian Plate ». Dans Fourth Arabian Plate Geology Workshop. Netherlands : EAGE Publications BV, 2012. http://dx.doi.org/10.3997/2214-4609.20142778.

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Rapports d'organisations sur le sujet "Jurassic-Cretaceous"

Thomas, F. C., et R. A. Hasen. Fifteen hundred references for Jurassic and Lower Cretaceous forminifera. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1990. http://dx.doi.org/10.4095/130861.

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Thomas, F. C. The literature of Jurassic and early Cretaceous foraminifera - a compendium. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1997. http://dx.doi.org/10.4095/208915.

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Embry, A. F. New stratigraphic units, middle jurassic to lowermost cretaceous succession, Arctic Islands. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120253.

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Haggart, J. W. Progress in Jurassic and Cretaceous stratigraphy, Queen Charlotte Islands, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1992. http://dx.doi.org/10.4095/132826.

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Embry, A. F. Uppermost triassic, jurassic, and lowermost cretaceous stratigraphy, Melville Island area, Arctic Canada. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1994. http://dx.doi.org/10.4095/194020.

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Anderson, R. G. Jurassic and Cretaceous-Tertiary plutonic rocks on the Queen Charlotte Islands, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1988. http://dx.doi.org/10.4095/122705.

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Williamson, M. A., et F. P. Agterberg. A quantitative foraminiferal correlation of the late Jurassic and early Cretaceous offshore Newfoundland. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1990. http://dx.doi.org/10.4095/128094.

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Grinenko, V. S., A. V. Kostin, A. I. Kirichkova et M. S. ZHelonkina. NEW DATA ON THE UPPER JURASSIC – LOWER CRETACEOUS ROCKS IN THE EASTERN SIBERIAN PLATFORM. ВЕСТНИК ВГУ, 2018. http://dx.doi.org/10.18411/vgu-sg-2018-2-48-55.

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Pe-Piper, G., B. Tsikouras, D. J. W. Piper et S. Triantaphyllidis. Chemical fingerprinting of detrital minerals in the Upper Jurassic - Lower Cretaceous sandstones, Scotian Basin. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2009. http://dx.doi.org/10.4095/248226.

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Kellett, D. A., et A. Zagorevski. Overlap assemblages : Laberge Group of the Whitehorse Trough, northern Canadian Cordillera. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/326064.

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The Laberge Group was deposited during the Early to Middle Jurassic in a marginal marine environment, in the northern Canadian Cordillera. It occurs as a narrow, elongated siliciclastic unit along more than 600 km of strike length, overlapping the Intermontane terranes of southern Yukon and northwestern British Columbia. The Laberge Group was deposited on the Late Triassic Stuhini and Lewes River groups, a volcano-plutonic complex of the Stikine terrane (Stikinia), and, locally, the Kutcho Arc. It is overlain by Middle Jurassic to Cretaceous clastic units. The variations in clast composition and detrital zircon populations among these units indicate major changes in depositional environment, basin extent, and sources during the latest Triassic to Middle Jurassic. Detrital zircon populations are dominated by near contemporary Stuhini-Lewes River arc grains, consistent with dissection of an active arc. Detrital rutile and muscovite data show rapid cooling and exhumation of metamorphic rocks during the Early Jurassic. Thermochronological data indicate that basin thermal evolution was domainal, with at least five regional temperature-time histories.

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