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Relevant bibliographies by topics / Middle Jurassic

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Academic literature on the topic 'Middle Jurassic'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 June 2025

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Journal articles on the topic "Middle Jurassic"

1

LUKASHEVICH, ELENA D. "Limoniidae (Diptera) in the Upper Jurassic of Shar Teg, Mongolia." Zoosymposia 3, no. 1 (2009): 131–54. http://dx.doi.org/10.11646/zoosymposia.3.1.12.

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A diverse Late Jurassic crane fly assemblage is described from Shar Teg locality (SW Mongolia), viz. Architipula krzeminskii n.sp., A. ampla n.sp., Mesotipula sigmoidea n.sp., ?M. brevicella n.sp., M. (Metatipula n.subgen.) continens n.sp., Tipunia undata n.sp., T. jorgi n.sp., Cretolimonia jurassica n.sp., C. pygmaea n. sp., Eotipulina sharategica n.sp., E. paula n.sp., E. evidens n.sp. and Eotipuloptera sp. The genus Praearchitipula Kalugina, 1985 is transferred to Pediciidae; it is the first Mesozoic record of this family (Middle Jurassic of Siberia). One species originally included in Praearchitipula is transferred to Mesotipula: M. parvula (Kalugina, 1985) n.comb. from the Middle Jurassic of Siberia.

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Shi, Lu, Nan Ju, Yuhui Feng, Changqing Zheng, Yue Wu, and Xin Liu. "Petrogenesis and Tectonic Setting of the Early and Middle Jurassic Granitoids in the Chaihe Area, Central Great Xing’an Range, NE China." Minerals 13, no. 7 (2023): 917. http://dx.doi.org/10.3390/min13070917.

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To ascertain the Early-to-Middle Jurassic tectonic setting in the central Great Xing’an Range, this study investigated the Early and Middle Jurassic granitoids exposed in the Chaihe area in the central Great Xing’an Range based on isotopic chronology and petrogeochemistry. The results of this study show that the Early and Middle Jurassic granitoids have emplacement ages of 179–172 Ma. Moreover, the Early and Middle Jurassic granitoids are high-K calc-alkaline unfractionated I-type granitoids and high-K calc-alkaline fractionated I-type granitoids, respectively. The magma sources of the Early and Middle Jurassic granitoids both originated from the partial melting of newly accreted lower crustal basaltic rocks. Meanwhile, the Middle Jurassic magma sources were mixed with mantle-derived materials or ocean-floor sediments formed by the dehydration and metasomatism of subducted slabs. The Early and Middle Jurassic granitoids in the study area were formed in the subduction environment of the oceanic crust, in which the Mongol-Okhotsk oceanic plate was subducted southward beneath the Eerguna and Xing’an blocks. Moreover, the Siberian plate began to collide and converge with northeast China during the Middle Jurassic.

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Riccardi, Alberto C., Susana E. Damborenea, Miguel O. Manceñido, and Sara C. Ballent. "Middle Jurassic Biostratigraphyof Argentina." Geobios 27 (December 1994): 423–30. http://dx.doi.org/10.1016/s0016-6995(94)80163-0.

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XI-JIN, ZHAO, ROGER B. J. BENSON, STEPHEN L. BRUSATTE, and PHILIP J. CURRIE. "The postcranial skeleton ofMonolophosaurus jiangi(Dinosauria: Theropoda) from the Middle Jurassic of Xinjiang, China, and a review of Middle Jurassic Chinese theropods." Geological Magazine 147, no. 1 (2009): 13–27. http://dx.doi.org/10.1017/s0016756809990240.

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AbstractThe Middle Jurassic was a critical time in the evolution of theropod dinosaurs, highlighted by the origination and radiation of the large-bodied and morphologically diverse Tetanurae. Middle Jurassic tetanurans are rare but have been described from Europe, South America and China. In particular, China has yielded a number of potential basal tetanurans, but these have received little detailed treatment in the literature. Here we redescribe the postcranial skeleton of one of the most complete Chinese Middle Jurassic theropods,Monolophosaurus. Several features confirm the tetanuran affinities ofMonolophosaurus, but the possession of ‘primitive’ traits such as a double-faceted pubic peduncle of the ilium and a hood-like supracetabular crest suggest a basal position within Tetanurae. This conflicts with most published cladistic analyses that placeMonolophosaurusin a more derived position within Allosauroidea. We review the Middle Jurassic record of Chinese theropods and compareMonolophosaurusto other Middle Jurassic theropods globally. These comparisons suggest thatMonolophosaurusandChuandongocoelurusformed an endemic theropod clade limited to the Middle Jurassic of Asia. Other Middle Jurassic Chinese theropods deserve further study.

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DRUCKENMILLER, PATRICK S., and ERIN E. MAXWELL. "A Middle Jurassic (Bajocian) ophthalmosaurid (Reptilia, Ichthyosauria) from the Tuxedni Formation, Alaska and the early diversification of the clade." Geological Magazine 151, no. 1 (2013): 41–48. http://dx.doi.org/10.1017/s0016756813000125.

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AbstractOphthalmosauridae is a clade of derived thunniform ichthyosaurs that are best known from Callovian (late Middle Jurassic) to Cenomanian-aged (Late Cretaceous) deposits in both the Northern and Southern Hemispheres. Ophthalmosaurids arose prior to the Early–Middle Jurassic boundary, however, very little is known about their diversity and distribution in the earliest phase of their evolutionary history during the Aalenian–Bathonian (Middle Jurassic) interval. Here we describe new diagnostic ophthalmosaurid material from the Early Bajocian (Middle Jurassic) of Alaska. The specimen, UAMES 3411, is a partial disarticulated skull that was discovered in the Middle Jurassic Tuxedni Formation, which was deposited in shallow marine settings outboard of the then-accreting Wrangellia composite terrane. The new material is significant in that it is the first Jurassic ichthyosaur described from Alaska, one of the oldest ophthalmosaurids known and the only Middle Jurassic ophthalmosaurid described from the Northern Hemisphere. The new material adds to a rapidly growing data set on ophthalmosaurid diversity and suggests that the clade was geographically widespread by the Early Bajocian, very early in its evolutionary history.

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ZHANG, KUIYAN, JINHUA LI, DING YANG, and DONG REN. "A new species of Archirhagio Rohdendorf, 1938 from the Middle Jurassic of Inner Mongolia of China (Diptera: Archisargidae)." Zootaxa 1984, no. 1 (2009): 61–65. http://dx.doi.org/10.11646/zootaxa.1984.1.4.

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The small genus Archirhagio Rohdendorf is an extinct Jurassic group of brachyceran flies. So far, only two known species have been found in the Middle/Upper Jurassic of Karatau (Kazakhstan) and the Middle Jurassic of Daohugou (Inner Mongolia, China) respectively. In this paper, a new species from the Middle Jurassic of Daohugou is described. A key to the species of the genus Archirhagio is given.

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Sajjadi Hezaveh, Freshteh, Firoozeh Hashemi Yazdi, Ali Khazaei, Navid Navidi-Izad, and Mohammad Taghi Badihagh. "Palynology of the Middle Jurassic strata from the Alborz Ranges, northwestern Iran." Boletín de la Sociedad Geológica Mexicana 77, no. 1 (2025): A141124. https://doi.org/10.18268/bsgm2025v77n1a141124.

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Palynomorphs are used for palynostratigraphy, and to derive paleoecological and paleobiogeographical inferences from the Middle Jurassic Shemshak Formation, Alborz Ranges, northwestern Iran. The rock unit contains diverse, reasonably preserved palynofloras dominated by miospores and dinoflagellate cysts. Vertical distribution of miospores allows for the introduction of Klukisporites variegatus -Striatella spp.- Contignisporites burgeri assemblage zone in the host strata. The presence of such key miospore species as Striatella jurassica, S. patenii, S. seebergensis, and Contignisporites burgeri indicates a Middle Jurassic (late Bajocian–Bathonian) age. Based on the stratigraphic distribution of dinoflagellate cysts, encountered Cribroperidinium crispum Total Range Biozone (late Bajocian); Dichadogonyaulax sellwoodii Interval Biozone (Bathonian–early Callovian), and Subzone “a” of the D. sellwoodii Zone (early–middle Bathonian) are identified. Miospores dominating the examined assemblages are assigned, in ascending order of abundance, to Pterophyta, Coniferophyta, Pteridospermophyta, Lycophyta, Ginkgophyta, Cycadophyta, and Sphenophyta. Such parental vegetation apparently flourished under a wet, warm-to-warm-temperate climate. The co-occurrence of such index warm-moderate water dinoflagellate cysts as Pareodinia halosa, Ctenidodinium continuum, and Pareodinia ceratophora supports this overview. The assemblages though contain both Eurasian and Gondwanan elements but bear closer similarity to those from the former, thus suggesting paleoproximity to the northeastern margin of the Neotethys Ocean during the Middle Jurassic.

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Wang, Ping Li, Da Wei Lv, Hai Yan Liu, Xue Zheng, and Yu Lin Lv. "Migration Law of Mesozoic Qaidam Basin Depocenters." Advanced Materials Research 524-527 (May 2012): 63–66. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.63.

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According to stratigraphy and distribution features of the Qaidam Basin, and further the formation and migration of it’s depocenters, it is considered that the Middle-Upper Triassic were mainly sags scattered among the Qilian Mountains, the Alabasitao Mountains and the Kunlun Mountains; the Early Jurassic depocenters were located mainly in Lenghu depression and Yiliping sag at the northwest of the basin; several Middle Jurassic depocenters distributed from the northwest to the southeast of the basin along Sertengshan-Yuqia near front of the Qilian mountains; the Late Jurassic-Cretaceous depocenters moved east and south. The basin had been larger since the Middle Jurassic, and the sedimentary facies changed from semideep-deep lacustrine of the Early-Middle Jurassic to near-source variegated fluvial-lacustrine of the Late Jurassic and brownish red lakeshore of the Early Cretaceous.

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Xu, Zhongjie, Jintao Kong, Rihui Cheng, and Liaoliang Wang. "U–Pb dating of detrital zircons in the eastern Guangdong Basin, South China, and constraints on the tectonic transformation from the Early to Middle Jurassic." Canadian Journal of Earth Sciences 57, no. 4 (2020): 477–93. http://dx.doi.org/10.1139/cjes-2019-0050.

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Controversies exist regarding the mechanism of formation of basins located on the continental margin of South China as well as when they formed. It was ascertained based on clastic petrology, geochemical analysis, and zircon U–Pb dating that the sedimentary provenances in the eastern Guangdong Basin are mainly felsic igneous rocks from the late Early Jurassic to the Middle Jurassic. The late Early Jurassic Qiaoyuan Formation mainly shows major age peaks at approximately 238 Ma, 259 Ma, and 1858 Ma, and the Middle Jurassic Tangxia Formation shows major age peaks at approximately 169 Ma and 172 Ma. From the late Early Jurassic to the Middle Jurassic in the eastern Guangdong Basin, the source region changes from southwestern South China and southern South China to the eastern Nanling Range. It was determined by comparing the detrital zircon ages of the Qiaoyuan Formation and the Tangxia Formation with those of the late Paleozoic to early Mesozoic basins, and analyzing both the geochemical data and sedimentation, that the eastern Guangdong Basin changed from the basin-arc foreland basin of the late Early Jurassic to the back-arc extension basin of the Middle Jurassic. The changes in early Mesozoic detrital zircon age peaks indicate that the tectonic regime of the eastern Guangdong Basin ended the transformation from the Tethyan tectonic domain to the paleo-Pacific tectonic domain in the early Middle Jurassic (approximately 172 Ma).

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Ahmad, Fayez. "Middle Jurassic brachiopod faunas from Northwestern Jordan." Neues Jahrbuch für Geologie und Paläontologie - Monatshefte 2000, no. 5 (2000): 301–13. http://dx.doi.org/10.1127/njgpm/2000/2000/301.

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Dissertations / Theses on the topic "Middle Jurassic"

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Strogen, Dominic Paul. "Diagenesis of Middle to Upper Jurassic sandstones, East Greenland." Thesis, University of Reading, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323408.

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Carter, Elizabeth Sibbald. "Early and middle Jurassic Radiolarian biostratigraphy, Queen Charlotte Islands, B.C." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24586.

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Radiolarian biostratigraphy is used to construct an informal zonation for sediments of upper Pliensbachian to lower Bajocian age from the Maude and Yakoun Formations, Queen Charlotte Islands, B.C. Paleoenvironmental studies assess depositional environment and the effects of changing facies relationships on the fauna. Seven distinctive assemblages are recognized comprising 167 species of spumellarian and nassellarian Radiolaria. The first well established middle Toarcian radiolarian assemblages are documented and both these and upper Toarcian assemblages are highly diverse and contain many new and unusual forms. Five genera and 89 new species are described many of which have restricted biostratigraphic ranges. A chlorophyte algal cyst appearing in all lowest Bajocian samples may, with further study, prove to be a significant marker for the lower Bajocian in the Queen Charlotte Islands. Although Toarcian Radiolaria have been little studied, the assemblages compare with others from North America, the Mediterranean and Japan, and are distinctly Tethyan in aspect. This is consistent with the position of Wrangellia, which paleomagnetic and ammonite biogeographic evidence indicates was in the northern hemisphere within 30° of the equator during the Early to Middle Jurassic. Studies of the abundance of spumellarians vs. nassellarians indicate thatnassellarians predominate, are abundant and diverse in deeper-water deposits (middle Toarcian and lower Bajocian shales) whereas spume Marians, particularly those with multi-layered or spongy tests, dominate in shallow-water deposits (upper middle Toarcian to Aalenian sandstones). Shallow-water nassellarians are much less diverse but a few species (all multicyrtids with thickened tests) are very abundant. Depth appears to be the major factor controlling radiolarian distribution patterns in this relatively shallow-water setting. Studies of eustatic sea-level changes throughout the Jurassic have indicated that major phases of sea-level rise occurred in the early to mid Toarcian and in the early Bajocian with a major phase of sea-level lowering in the late Toarcian to Aalenian; detailed study of the radiolarian faunal succession in the Queen Charlotte Islands appears to confirm this major worldwide trend.<br>Science, Faculty of<br>Earth, Ocean and Atmospheric Sciences, Department of<br>Graduate

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Vincent, Alastair James. "Palynofacies analysis of middle Jurassic sediments from the Inner Hebrides." Thesis, University of Newcastle Upon Tyne, 1995. http://hdl.handle.net/10443/979.

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A quantitative palynofacies study of thermally immature Middle Jurassic sediments of Skye, Raasay, and Eigg has been undertaken in order to examine kerogen and palynomorph distributions in relation to various potential controlling factors (lithology, lithofacies, depositional environment, sequence stratigraphy). This has involved performing rigorous kerogen and palynomorph counts on 440 samples from 12 localities (average sampling density 5 per metre in sampled sections), supported by 250 TOC and 57'Rock-Eval' pyrolysis analyses. The facies of the Middle Jurassic sediments of the Inner Hebrides range from subtidal marine to freshwater alluvial mudflats. The succession is divided into three major units: the Bearreraig Sandstone Formation (Aalenian-Bajocian) which is 400m thick, and represents the deposition of tidalsubtidal sand sheets, the ? Bathonian Great Estuarine Group (250m thick) which represents a range of mostly lagoonal-deltaic freshwater to hypersaline facies, and finally the Staffin Bay Formation (lowermiddle Callovian; thickness 18m) which represents a transgressive lagoon-barrier bar complex. ... The detailed subdivision of the phytoclast group has permitted the calculation of a phytoclast preservation index (PPI) which summarises the overall degradation state of the phytoclast assemblage for each sample. The highest PPI values (= most refractory phytoclast assemblagesa) re found in the mudflat-alluvial facies of the Skudiburgh Formation, lowest PPI values, reflecting 'fresh' phytoclast input, are found in the transgressive Staffin Bay Formation. The TOC values are generally <2.5%, but reach up to 3-4% in parts of the Dun Caan Shales Member (Bearreraig Sandstone Formation) and the Lonfearn Member (Lealt Shales Formation), and 6-8% in the Upper Ostrea Member (Staffin Bay Formation). Hydrogen Index (HI) values mostly fall below 300 (organic facies C or CD), but are increased in parts of the Lonfearn and Upper Ostrea members (400- 500, organic facies B), and particularly in the Kilmaluag Formation where values of over 800 are found (= organic facies AB). The correlation between the optical and geochemical data varies from very poor to very good. In some cases TOC is correlated with %AOM, and also %Botryococcus. Multiple regression on the HI suggests that in most cases %AOM is the variable best correlated with the HI; this procedure has allowed the calculation of a predicted HI value for all 440 samples.

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TANAKA, Shiro, Yusei KUROYANAGI, Kazuhiro SUZUKI, and Mamoru ADACHI. "Permo-Triassic and Early-Middle Jurassic granitoid clasts from the Jurassic conglomerates in the Mino terrane, central Japan." Dept. of Earth and Planetary Sciences, Nagoya University, 2002. http://hdl.handle.net/2237/2854.

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Brint, John Forsyth. "Isotope diagenesis and palaeofluid movement : Middle Jurassic Brent sandstones, North Sea." Thesis, University of Strathclyde, 1989. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=23310.

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The Middle North Sea, have simplified to a Jurassic deltaic Brent Group sandstones, northern complicated diagenetic sequence which may be kaolinite Fe,Ca carbonates - High porosities and Ness and Tarbert quartz overgrowths - Fe,Mg carbonates - illite. existed in the Etive, throughout diagenesis. By permeabilities have Formation sandstones contrast, the highly micaceous and r,elatively finer grained Rannach Formation sandstones have good porosities but very poor permeabilities due to burial compaction and carbonate cementation. Oxygen and hydrogen isotope studies indicate that early diagenesis occurred in a dominantly meteoric pore water (6180 = -7%0). The early diagenetic cements of siderite, vermicular kaolinite and calcite started to precipitate at 14, 26 and 32DC respectively. With the onset of burial, below 1.2 km, the Brent sequence eventually became sealed off from the meteoric 'head' by Lower Cretaceous sediments. Blocky kaolinite precipitated and by the end Cretaceous quartz overgrowth formation commenced. Fluid inclusions in the overgrowths indicate formation from a warm, dominantly low salinity water (1 - 5 wt.% eq. NaCl). Homogenisation temperatures range from 73to 131 DC. Illite precipitation is cogenetic with the latest stages of quartz overgrowth precipitation (K/Ar illite date, 58Ma.) and has reduced porosity and permeability markedly in different locations prior to oil migration. The depth of burial at which this last cementation event occurred is 2.3 km. Fluid inclusion microthermometry indicates that quartz overgrowth and latest ankerite precipitation occurred in a geothermal gradient of 70DC/km. After this heat excursion the reservoirs have cooled back to present day temperatures of 85 - 11SDC. Water values computed from the mineral cements indicate precipitation from a porefluid which has gradually evolved isotopically to its present day composition (5180 = -7 to +2%.SMOW) in an isotopic system that has become closed during burial. However the quartz and ankerite suggest one unusual episode of open system hot fluid input.

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Norris, Michelle Samantha. "A facies analysis of Middle-Upper Jurassic boundary beds in Europe." Thesis, University of Birmingham, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.539902.

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A facies analysis of Middle-Upper Jurassic boundary beds, i.e. Callovian-Oxfordian Stage boundary beds, has been carried out on numerous sections across Europe, with the aim of constructing relative sea-level curves for each geographic area. Accurate correlation of the various epeiric-sea, sedimentary successions has been achieved using ammonite zonations. The comparison of twelve relative sea-level curves has led to the recognition of regional sea-level events in Europe during the Callovian-Early Oxfordian interval. A regional sea-level rise occurred during the Middle and Late Callovian, reaching its greatest extent in the latest Callovian (lambert; Zone), and highstand conditions and incipient sea-level fall characterized the Early Oxfordian. A literature review of Callovian-Oxfordian boundary beds in six further regions from four other continents has shown that a Middle Callovian sea-level rise and Late Callovian-Early Oxfordian phase of high sea-level can be recognized on a global scale. The European regional sea-level changes are, therefore, considered to be eustatic in origin, and are a response to a third, or possibly second-order, eustatic cycle of 6-1 0 Ma. A "Norris eustatic curve" has been constructed and compared with two published eustatic curves. It differs markedly from that of Hallam (1988), also based on the facies analysis technique, but is very similar to that of Haq el al. (1987), based on sequence stratigraphic concepts. However, the systems tracts and coastal onlap curve of the Haq ct al. (1987) chart are at odds with the facies interpretations made in this study, reflecting the inadequacy of the sequence stratigraphy model in addressing the Jurassic epicontinental sea successions.

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Greenwood, Peter Jeremy. "Diagenesis of Middle Jurassic sandstones and mud rocks, Brae area, North Sea." Thesis, Imperial College London, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294999.

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Ploynoi, Manwika Parcell William C. "Development of middle Jurassic microbial buildups in the Bighorn Basin of northern Wyoming." Diss., A link to full text of this thesis in SOAR, 2007. http://soar.wichita.edu/dspace/handle/10057/1150.

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Thesis (M.S.)--Wichita State University, College of Liberal Arts and Sciences, Dept. of Geology.<br>"May 2007." Title from PDF title page (viewed on Dec. 27, 2007). Thesis adviser: William C. Parcell. Includes bibliographic references (leaves 73-77).

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Corbett, Patrick W. M. "Reservoir characterisation of a laminated sediment : the Rannoch Formation, Middle Jurassic, North Sea." Thesis, Heriot-Watt University, 1993. http://hdl.handle.net/10399/1435.

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The probe permeameter is a recently developed device providing a small scale measurement of permeability. About 15,000 probe permeameter measurements were acquired for analysis during this study. These data were acquired by Statoil from cores in two North Sea wells. These cores are from the Middle Iurassic Rannoch Formation of the Brent Group. This reservoir unit was selected for this study because of its laminated nature and challenge to conventional description and simulation practice. All aspects of probe permearnetry are investigated in this study; the volume of investigation, the compatibility with measurements at larger scales, the measurement statistics. the optimum sample spacing. the relationship of the measurements to the geological description and the scale-up of data for two-phase numerical reservoir simulation. Careful analysis of probe and traditional plug data shows that the measurements are compatible. Systematic differences could be accounted for by different treatment effects of the material. The probe measurements show that the permeability distribution in the Rannoch Formation is closely related to the primary depositional structure of the sediment at a hierarchy of scales. This observation is used in combination with conventional simulation techniques to build a more geologically-realistic numerical model of the Rannoch Formation. The scale-up of the small scale measurements is achieved by generation of effective properties for geologically representative elements at various scales and is called the "geopseudo" method. The scale of the natural building blocks within the sediment were determined with the aid of an appropriate outcrop analogue. The model results compare favourably with field production data. This work demonstrates. for the first time. a systematic method for the scale-up of small scale petrophysical properties associated with lamination in sedimentary rocks. as measured by the probe permeameter. Laminated reservoirs are widely encountered and this work. therefore. makes a significant contribution to reservoir engineering practice.

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Noe`, Leslie Francis. "A taxonomic and functional study of the Callovian (Middle Jurassic) Pliosauroidea (Reptilia, Sauropterygia)." Thesis, University of Derby, 2001. http://hdl.handle.net/10545/211770.

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The short-snouted Callovian pliosaurs, Liopleurodon ferox SAUVAGE 1873, Simolestes vorax ANDREWS 1909 and Pachycostasaurus dawni CRUICKSHANK, MARTILL and NOE 1996, of the Peterborough Member, Oxford Clay Formation are of considerable palaeontological importance. The restricted geographical and temporal range, exceptional preservation, relative abundance, and easy removal of matrix, make the Callovian pliosaurs excellent subjects for detailed study. Skull material is known from all Callovianpliosaurs, but has been little studied, and much excellent material remains undescribed. The taxonomy of the short-snouted Callovian pliosaurs is thus in need of critical revision. Cranial functional morphology goes largely undiscussed, and the palaeoecological position of the short-snouted genera is poorly understood. The taxonomy of the short-snouted Callovian pliosaurs is critically revised, and the genera Liopleurodon, Simolestes and Pachycostasaurus shown to be monospecific and taxonomically valid. The holotype material for Liopleurodon ferox is poor (a single tooth) but exhibits sufficient characteristics for taxonomic definition. The holotype material of Simolestes vorax and Pachycostasaurus dawni, an incomplete skull and postcranial skeleton in each case, is taxonomically robust. Never before attempted cranial reconstructions, in multiple views, are presented for each genus. Detailed cranial, mandibular and dental descriptions of Liopleurodon and Simolestes are presented, with description of many new, newly recognised and previously unfigured specimens. The presence of nasals is definitively demonstrated for the first time in any pliosaur genus. The likely presence of a lacrimal in Liopleurodon indicates the relatively plesiomorphic position of the pliosaurs within the Plesiosauria. The skull ofPachycostasaurus is described for the first time, although in less detail than the other two genera due to relatively poor preservation. The teeth of all three genera are described in detail, and a number of new parameters, such as crown stoutness and crown curvature, presented. A comprehensive structural and functional analysis indicates the skull is highly akinetic, and firmly internally braced. The superficial sutural pattern is adapted to resist deformation imposed by muscular action, particularly when feeding. The inference of strongly procumbent teeth in the short-snouted Callovian pliosaurs is shown to be based on the incorrect interpretation of badly crushed specimens. The skull musculature is reconstructed for the first time in a Callovian pliosaur, and an analysis of the lever systems exhibited by the jaws and muscles is presented. The adductor musculature is interpreted as a `geared' system providing mechanical advantage no matter where the teeth strike the prey, rather than the `snap and hold system' previously interpreted in non-Callovian pliosaurs. An analysis of tooth form, preserved stomach contents, and comparison with an existing model allows interpretation of prey preference and ecological position. Liopleurodon, and possibly Pachycostasaurus, are interpreted as shake and bolt feeding, high order predators of large boned, vertebrate prey. Simolestes is reinterpreted as an invertebrate feeder, possibly twist feeding, with a short, wide, high skull and a powerful bite. Comparison is made to the long-snouted genus Peloneustes which is considered ichthyophagous. The potential problems associated with a predominantly invertebrate diet are explored. Simolestes is interpreted as gaining a considerable electrolyte load through a diet of invertebrates. To avoid physiological problems Simolestesp robably possessedla rge, orbitally positioned, cephalic salt secreting glands. All Callovian pliosaur genera probably also possessed salt secreting glands, but of smaller size

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Books on the topic "Middle Jurassic"

1

Cox, B. M. English Callovian (Middle Jurassic) perisphinctid ammonites. Palaeontographical Society, 1988.

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Cox, B. M. English Callovian (Middle Jurassic) perisphinctid ammonites. Palaeontographical Society, 1988.

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Imlay, Ralph Willard. Early and middle Bajocian (middle Jurassic) ammonites from southern Alaska. U.S. G.P.O., 1985.

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Moon, Benjamin C. Ichthyosaurs of the British Middle and Upper Jurassic. The Palaeontographical Society, 2016.

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Wakefield, M. I. Middle Jurassic (Bathonian) ostracoda from the Inner Hebrides, Scotland. Palaeontographical Society, 1994.

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Sumbler, M. G. The Lincolnshire limestone formation (Middle Jurassic) near Grantham, Lincolnshire. British Sedimentological Research Group, 1991.

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Guthrie, Gregory M. Pre-Middle Jurassic rocks beneath the Alabama Gulf Coastal Plain. Geological Survey of Alabama, Stratigraphy and Paleontology Division, 1992.

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Dybkjær, Karen. Palynological zonation and palynofacies investigation of the Fjerritslev Formation (Lower Jurassic-basal Middle Jurassic) in the Danish Subbasin. Danmarks geologiske undersøgelse, 1991.

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Norris, Michelle Samantha. A facies analysis of Middle-Upper Jurassic boundary beds in Europe. University of Birmingham, 1993.

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International Association of Radiolarian Paleontologists and INTERRAD Jurassic-Cretaceous Working Group, eds. Middle Jurassic to Lower Cretaceous radiolaria of Tethys: Occurences, systematics, biochronology. Section des Sciences de la Terre, Université de Lausanne, 1995.

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Book chapters on the topic "Middle Jurassic"

1

Wang, Huiji, and Shengqiu Yang. "Middle Jurassic Gastropods from Xizang (Tibet), China." In Palaeontologia Cathayana. Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-662-12662-2_7.

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Ballent, Sara C. "Lower and Middle Jurassic Ostracoda from Argentina." In Ostracoda and Global Events. Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-1838-2_15.

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Frazier, William J., and David R. Schwimmer. "The Zuni Sequence: Middle Jurassic—Upper Cretaceous." In Regional Stratigraphy of North America. Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1795-1_8.

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Gómez, Juan José, Roque Aguado, Ana Cristina Azerêdo, et al. "The Late Triassic–Middle Jurassic Passive Margin Stage." In The Geology of Iberia: A Geodynamic Approach. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-11295-0_4.

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Khain, V. E., A. N. Balukhovsky, and K. B. Seslavinsky. "Middle Triassic to Middle Jurassic: Eve of Break-up of Pangaea II." In Historical Geotectonics. Routledge, 2021. http://dx.doi.org/10.1201/9780203751855-1.

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RAVNÅS, RODMAR, KARI BERGE, HEATHER CAMPBELL, CRAIG HARVEY, and MIKE J. NORTON. "Halten Terrace Lower and Middle Jurassic inter-rift megasequence analysis." In From Depositional Systems to Sedimentary Successions on the Norwegian Continental Margin. John Wiley & Sons, Ltd, 2014. http://dx.doi.org/10.1002/9781118920435.ch10.

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Ravenne, C., A. Galli, H. Beucher, R. Eschard, D. Guerillot, and Heresim Group. "Outcrop Studies and Geostatistical Modelling of a Middle Jurassic Brent Analogue." In The European Oil and Gas Conference. Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-010-9844-1_72.

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Hirsch, Francis, Howard R. Feldman, Fayez Ahmad, Mena Schemm-Gregory, and Mark A. Wilson. "Correlation of the Middle Jurassic (Callovian) Formations Across the Dead Sea Rift." In Springer Geology. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04364-7_126.

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

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Massari, Francesco, and Hildegard Westphal. "Microbialites in the Middle–Upper Jurassic Ammonitico Rosso of the Southern Alps (Italy)." In Cellular Origin, Life in Extreme Habitats and Astrobiology. Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0397-1_10.

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Conference papers on the topic "Middle Jurassic"

1

Qin, Guosheng, and Youjing Wang. "Jurassic Hydrocarbon System Appraisal and Implications for Prospectively in Central and Southern Iraq, Middle East." In 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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Kavoosi, M. A., M. Sepehr, and S. Sherkati. "Kopet-Dagh Basin Evolution During Middle-late Jurassic." In 1st International Petroleum Conference and Exhibition Shiraz 2009. EAGE Publications BV, 2009. http://dx.doi.org/10.3997/2214-4609.20145873.

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Yousif, Samir, and Ghalib Nouman. "Geological Model Of The Jurassic Section In The State Of Kuwait." In Middle East Oil Show. Society of Petroleum Engineers, 1995. http://dx.doi.org/10.2118/29796-ms.

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Hu, J., J. Witte, and F. A. Neves. "Regional Characterization of Middle Triassic-Middle Jurassic Tight Reservoirs in Abu Dhabi, UAE." In Third EAGE/AAPG Workshop on Tight Reservoirs in the Middle East. EAGE Publications BV, 2015. http://dx.doi.org/10.3997/2214-4609.201414107.

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Wilson, E. N. "Evaluation of Jurassic Arab D Reservoir Quality in Low-Relief Traps in Qatar." In Middle East Oil Show. Society of Petroleum Engineers, 1991. http://dx.doi.org/10.2118/21447-ms.

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Hassan, T. H. "The Lower and Middle Jurassic in Offshore Abu Dhabi: Stratigraphy and Hydrocarbon Occurrence." In Middle East Oil Show. Society of Petroleum Engineers, 1989. http://dx.doi.org/10.2118/18011-ms.

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Toland, Christopher, R. G. Peebles, and G. M. Walkden. "Upper Jurassic and Basal Cretaceous Outcrop Sequence Stratigraphy of Wadi Hagil, Ras Al Khaimah." In Middle East Oil Show. Society of Petroleum Engineers, 1993. http://dx.doi.org/10.2118/25581-ms.

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Ruiz, Daniel, Daniel F. Stockli, and Elisa Fitz-Diaz. "EARLY TO MIDDLE JURASSIC JURASSIC RIFTING IN SOUTHEAST MEXICO AND IMPLICATIONS FOR GULF OF MEXICO OPENING." In GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-380561.

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Al-Dousari, Sara, Haifa Al-Bader, Ahmed Al-Otaibi, Sara Al-Shuaib, and Bahaskar Chakrabarti. "Significant Impact of Non H-C Gases (NHG) on Reservoir Fluid of a Jurassic, HPHT and Tight Carbonate Discovery in North of Kuwait: A Case Study of a Sour and Critical Fluid Characteristics and Fluid Compartmentalization." In Middle East Oil, Gas and Geosciences Show. SPE, 2023. http://dx.doi.org/10.2118/213472-ms.

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Abstract The objective of this paper is to show the effect of non-HC gases NHG on critical fluid characterization of HPHT discovered deep Jurassic reservoir in north Kuwait in addition to Fluid characterization and compartmentalization with objective of assessing HC potential, well deliverability and reservoir fluid & rock characteristics. Jurassic reservoirs in the state of Kuwait are deep and tight with High-Pressure and High-Temperature (HPHT) environment. The discovery well was drilled targeting the Marrat formation to prove hydrocarbon in this area. The well was successfully completed & tested and then a complete set of surface & subsurface data was acquired including production measurements and downhole P/T gauge data. The produced fluid was found highly sour and of critical-nature Therefore, a detailed fluid characterization process plus a fully-integrated G&G and Engineering analyses were performed to distinguish the fluid nature whether it is Volatile Oil or Gas Condensate and to prove reservoir and fluid compartmentalization using multiple PVT experiments and different analog wells from North Kuwait. Moreover, historical reservoir pressure and well performance for all the wells in this field were tracked and analyzed as t the discovered well was followed with an intensive appraisal campaign with variance in reservoir/fluids characteristics with objective of assessing HC potential for further Development plan to support achieving the strategic production targets. The four wells connected to one of Jurassic Facilities and ready for further development. By integrating both reservoir and fluid analysis, The Northern part observed better reservoir quality and production performance, while reservoir layers are thinning toward the southern part of the structure with the appearance of organic content. The PVT depletion experiments along with compositional analysis and phase envelop all indicated reservoir fluid type is Volatile oil, where saturation pressure is sensitive to reservoir temperature and percentage of non-hydrocarbon gases H2S & CO2. As a result, the fluid found to be highly volatile oil with very high GOR. Fluid compartmentalization is also observed in this field between the three wells as the fluids were lighter towards the south, which will be confirmed after testing the fourth well that was initially drilled to prove the structure boundary/extension. Tremendous exploration efforts and activities resulted in remarkable Jurassic light oil discovery with substantial addition of proven reserves and commercial production potential, which will definitely support achieving the strategic production targets. The exploratory and appraisal wells are currently connected to one of Kuwait's Jurassic facilities handling high concentrations of H2S. After the completion of exploration campaign and completing the fully-Integrated Engineering analyses the reservoir is ready to be transferred to the Hosting Field development.

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Kimbrough, David L. "MIDDLE JURASSIC CORDILLERAN ARC FLARE-UP AND BAJOCIAN ENVIRONMENTAL IMPACT." In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-332926.

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Reports on the topic "Middle Jurassic"

1

Monger, J. W. H., J. O. Wheeler, H. W. Tipper, et al. Cordilleran Terranes [Chapter 8: Upper Devonian To Middle Jurassic Assemblages]. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/134091.

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Kellett, D. A., and 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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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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Mahoney, J. B. Middle Jurassic stratigraphy of the Lillooet area, south-central British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1992. http://dx.doi.org/10.4095/132811.

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Gordey, S. P., H. H. J. Geldsetzer, D. W. Morrow, et al. Ancestral North America [Chapter 8: Upper Devonian To Middle Jurassic Assemblages]. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/134089.

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Wilson, R. C. L. A Reconnaissance Sedimentological Study of the Middle Jurassic Shaunavon Formation, southwestern Saskatchewan. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/130159.

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Ricketts, B. D., and C. A. Evenchick. Analysis of the Middle To Upper Jurassic Bowser Basin, northern British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/132498.

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Brown, R. L., V. J. McNicoll, R. R. Parrish, and R. J. Scammell. Middle Jurassic Plutonism in the Kootenay Terrane, northern Selkirk Mountains, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1992. http://dx.doi.org/10.4095/132918.

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Poulton, T. P., R. L. Hall, H. W. Tipper, B. E. B. Cameron, and E S Carter. Current Status of Middle Jurassic Biostratigraphy of the Queen Charlotte Islands, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/131973.

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Haggart, J. W. New Sections of Yakoun Group [Middle Jurassic] Strata, Queen Charlotte Islands, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/132533.

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