Journal articles: 'Sirius Passet'

1

Brooks, Kent. "Sirius Passet, Greenland and the Cambrian Explosion." Geology Today 28, no. 4 (July 2012): 144–46. http://dx.doi.org/10.1111/j.1365-2451.2012.00842.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Boudec, Ange Le, Jon Ineson, Minik Rosing, Lasse Døssing, François Martineau, Christophe Lécuyer, and Francis Albarède. "Geochemistry of the Cambrian Sirius Passet Lagerstätte, Northern Greenland." Geochemistry, Geophysics, Geosystems 15, no. 4 (April 2014): 886–904. http://dx.doi.org/10.1002/2013gc005068.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Peel, J. S., S. C. Morris, and J. R. Ineson. "A second glimpse of Early Cambrian life: new collections from Sirius Passet, North Greenland." Rapport Grønlands Geologiske Undersøgelse 155 (January 1, 1992): 48–50. http://dx.doi.org/10.34194/rapggu.v155.8180.

Full text

Abstract:

The German mining term lagerstatten, referring to a rock of any composition containing constituents of economic interest, has been widely applied to occurrences of abundant or unusually well preserved fossils (cf. Seilacher et al., 1985). The Middle Cambrian Burgess Shale of western Canada is perhaps the most famous of all fossil-lagerstatt, with many of the approximately 140 known species preserving exquisite details of the soft anatomy of members of a community of organisms that was fossilised more than 500 million years ago (Whittington, 1985: Conway Morris, 1979, 1986; Gould, 1989). Other well known examples include the Upper Cambrian 'Orsten' of southern Sweden, the Lower Devonian Hunsruck Slate and the Jurassic Solnhofen Limestone of Germany (Stürmer et al.. 1980; Muller, 1985; Barthel et al. 1990; summary in Briggs & Crowther, 1990, pp. 266–297). The term can be applied aptly to the Sirius Passet fauna of central North Greenland, where a wealth of exceptionally preserved fossils (e.g. Fig. 1) from tile Lower Cambrian Buen Formation has been recorded from a small locality in western Peary Land, near the south-western end of the broad valley known as Sirius Passet (Fig. 2). The locality yielding the Sirius

APA, Harvard, Vancouver, ISO, and other styles

4

Peel, John S. "A corset-like fossil from the Cambrian Sirius Passet Lagerstätte of North Greenland and its implications for cycloneuralian evolution." Journal of Paleontology 84, no. 2 (March 2010): 332–40. http://dx.doi.org/10.1666/09-102r.1.

Full text

Abstract:

A large (maximum length 80 mm), tubular, corset-like problematic fossil from the early Cambrian (Cambrian Series 2, Stage 3) Sirius Passet Lagerstätte of North Greenland is interpreted as the lorica of an ancestral loriciferan. in addition to the double circlet of 7 plates composing the lorica, Sirilorica carlsbergi new genus, new species also preserves up to six multicuspidate cuticular denticles that are similar in shape to the pharyngeal teeth of priapulid worms, although their location is suggestive of scalids. Whilst traditionally placed as a sister group of priapulid worms within Vinctiplicata (Scalidophora), recent molecular sequence data suggest that loriciferans might be more closely related to nematomorphs. the limited morphological information available from Sirilorica is consistent with this interpretation, placing the Sirius Passet fossil within the total-group of Loricifera, within the Loricifera + Nematomorpha clade.

APA, Harvard, Vancouver, ISO, and other styles

5

Ineson, Jon R., and John S. Peel. "Geological and depositional setting of the Sirius Passet Lagerstätte (Early Cambrian), North Greenland." Canadian Journal of Earth Sciences 48, no. 8 (August 2011): 1259–81. http://dx.doi.org/10.1139/e11-018.

Full text

Abstract:

The Early Cambrian Sirius Passet Lagerstätte of North Greenland occurs in marine mudstones (Buen Formation) deposited in a slope environment along the eroded scarp of a pre-existing carbonate platform. The shallow-water platform is represented by dolostones of the Portfjeld Formation (Neoproterozoic – earliest Cambrian), which record a belt of tide-swept subtidal ooid shoals and microbial patch reefs at the outer edge of the platform. Solution features and meteoric cements attest to exposure of the platform, accompanied by fracturing, mass wastage and erosional retreat of the escarpment producing slope talus, and extensive debris sheets and olistoliths in basinal deposits. The marine mud-dominated siliciclastics of the Buen Formation, deposited in slope and shelf environments, record the transgression and onlap of the degraded platform in the Early Cambrian. The Sirius Passet Lagerstätte has yielded an arthropod-dominated fossil assemblage of over 40 species, many showing exceptional preservation of soft tissues; the finely laminated mudstones hosting this fauna accumulated from suspension in a poorly oxygenated slope sub-environment, such as an erosional embayment or abandoned slope gully. Although taphonomic features suggest that the fauna is mainly parautochthonous, some components (e.g., sponges, worms, the halkieriids and certain sightless arthropods) may be truly autochthonous. Comparison of the Sirius Passet locality with the renowned Middle Cambrian Burgess Shale of western Canada reveals similarities in overall depositional and tectonic setting: both accumulated in deep water adjacent to the steep, eroded margins of carbonate platforms — settings that subsequently sheltered the faunas from tectonic and metamorphic obliteration.

APA, Harvard, Vancouver, ISO, and other styles

6

Botting, Joseph P., and John S. Peel. "Early Cambrian sponges of the Sirius Passet Biota, North Greenland." Papers in Palaeontology 2, no. 4 (June 28, 2016): 463–87. http://dx.doi.org/10.1002/spp2.1048.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Lagebro, Linda, Martin Stein, and John S. Peel. "A New ?lamellipedian arthropod from the Early Cambrian Sirius Passet Fauna of North Greenland." Journal of Paleontology 83, no. 5 (September 2009): 820–25. http://dx.doi.org/10.1666/09-011.1.

Full text

Abstract:

The Non-Mineralized arthropod described herein is derived from the Sirius Passet fossil conservation deposit of North Greenland (82°47.6,N, 42°13.7ʹW), the oldest locality with exceptional preservation of soft tissues known from the Cambrian of Laurentia (Cambrian Series 2, Stage 3; Nevadella Zone). As such, it is broadly contemporaneous with the Chengjiang fauna of China (Hou et al., 2004) and some 10 million years older than the Burgess Shale fauna of British Columbia. The Sirius Passet fauna was first documented by Conway Morris et al. (1987) and its geological setting is discussed by Babcock and Peel (2007). In addition to the nevadiid trilobite Buenellus higginsi Blaker, 1988, the fauna is dominated by non-mineralized arthropods (Budd, 1993, 1995, 1997, 1999; Williams et al., 1996; Taylor, 2002). Other finds include sponges (Rigby, 1986), a lobopod (Budd and Peel, 1998), the earliest annelids (Conway Morris and Peel, 2008) and articulated halkieriids (Conway Morris and Peel, 1990, 1995), but most of the assemblage awaits description.

APA, Harvard, Vancouver, ISO, and other styles

8

Peel, John S., Sebastian Willman, and Steven J. Hageman. "The oldest hyolithids (Cambrian Series 2, Montezuman Stage) from the Iapetan margin of Laurentia." Journal of Paleontology 94, no. 4 (April 2, 2020): 616–23. http://dx.doi.org/10.1017/jpa.2020.8.

Full text

Abstract:

AbstractThe recent description of the nevadioid trilobite Buenellus chilhoweensis Webster and Hageman, 2018 established the presence of early Cambrian Montezuman Stage (Cambrian Series 2, Stage 3) faunas in the Murray Shale of Chilhowee Mountain, Tennessee. The description recognized the oldest known age-diagnostic Cambrian trilobite from the Laurentian margin of the former Iapetus Ocean since Buenellus Blaker, 1988 is known otherwise only from the Sirius Passet Lagerstätte on the Innuitian margin of North Greenland. The bivalved arthropods Isoxys chilhoweanus Walcott, 1890 and Indota tennesseensis (Resser, 1938a) have also been described from the Murray Shale, but hyolithids appear to be the dominant body fossils in terms of diversity and abundance. Although poorly preserved, the hyolithids occurring together with Buenellus chilhoweensis are described to improve understanding of the Murray Shale biota. The hyolith assemblages of the Murray Shale and Sirius Passet Lagerstätte are not closely similar, although the poor preservation of both hinders comparison.

APA, Harvard, Vancouver, ISO, and other styles

9

Williams, Mark, David J. Siveter, and John S. Peel. "Isoxys (Arthropoda) from the Early Cambrian Sirius Passet Lagerstätte, North Greenland." Journal of Paleontology 70, no. 6 (November 1996): 947–54. http://dx.doi.org/10.1017/s0022336000038646.

Full text

Abstract:

The marine offshore shelf mudstones of the Early Cambrian Buen Formation at Sirius Passet, North Greenland, contain a rich Konservat-Lagerstätte which includes abundant well-preserved material of the bivalved arthropod Isoxys volucris new species. The new material confirms Isoxys Walcott, 1890 as a component of the earliest arthropod faunas worldwide. Isoxys species are known from the Early Cambrian of Spain, Siberia, South Australia and Southwest China and also from the Early to Middle Cambrian of Laurentian North America. Isoxys occurs in the Redlichiid, Bigotinid and Olenellid trilobite faunal realms but is restricted to within tropical/subtropical regions, attesting to possible paleolatitudinal controls on its distribution. Isoxys resembles some phyllocarid and bradoriid arthropods but without knowledge of its soft-parts the affinity of the genus remains uncertain.

APA, Harvard, Vancouver, ISO, and other styles

10

Peel, John S., Simon Conway Morris, and Jon R. Ineson. "The Sirius Passet Fauna, an Early Cambrian Lagerstätte from North Greenland." Paleontological Society Special Publications 6 (1992): 233. http://dx.doi.org/10.1017/s2475262200007930.

Full text

Abstract:

The Sirius Passet Fauna of North Greenland is one of the oldest Cambrian lagerstätten from the North American continent. It is known from a single locality in Peary Land (83°N, 40°W), on the shores of the Arctic Ocean, where outer shelf mudstones from the lower part of the Buen Formation (Early Cambrian) yield a rich assemblage of mainly poorly skeletised organisms with preserved soft parts. The steeply-dipping fossiliferous mudstones occur in close proximity to horizontally-bedded platform carbonates of the underlying Portfjeld Formation (Early Cambrian) in a structurally complex terrane. The boundary between the fossiliferous mudstones and the platform carbonates apparently defines the original northern margin of the carbonate platform and is not, as previously suggested, a structural feature, although some minor tectonic modification can not be excluded. Thus, the fossiliferous mudstones were apparently deposited in a transitional slope setting basinward of the shelf edge.As currently known, the Sirius Passet Fauna comprises about 40 species, based on a collection of almost 5,000 slabs collected during brief visits to the isolated locality in 1989 and 1991. Arthropods dominate, with bivalved bradoriids and the trilobite Buenellus higginsi Blaker, 1988 being the numerically most abundant taxa. Weakly skeletised Naraoia-like and Sidneyia-like arthropods often preserve limbs and gills, as do bivalved arthropods similar to Waptia. Choia is the most common of several sponges. Worms include both priapulids and polychaetes, with a large palaeoscolecidan being conspicuous.Fully articulated specimens of halkieriid worms, clad in an armour of hundreds of individual sclerites, are most notable amongst several problematic taxa. Rare specimens of possible onychophorans are also present, while brachiopods, hyoliths and other shelly fossils are rare or absent.The Sirius Passet Fauna seems to show little taxonomic similarity to the Middle Cambrian Burgess Shale of western Canada or the Chengjiang Fauna from the Lower Cambrian of China at the generic level. Together with the latter fauna, however, it confirms both the general picture of Cambrian life presented by the Burgess Shale, and the existence of this great diversity of weakly skeletised arthropods already in the Early Cambrian.

APA, Harvard, Vancouver, ISO, and other styles

11

Daley, Allison C., and John S. Peel. "A possible anomalocaridid from the Cambrian Sirius Passet Lagerstätte, North Greenland." Journal of Paleontology 84, no. 2 (March 2010): 352–55. http://dx.doi.org/10.1666/09-136r1.1.

Full text

Abstract:

The Sirius Passet biota of North Greenland is one of the oldest Cambrian lagerstätten, and although it is dominated by non-mineralized arthropods and lobopods, anomalocaridids have never been identified. Based on a single specimen, we herein describe for the first time an appendage with possible anomalocaridid affinities as suggested by an overall gross morphology similar to that of the frontal appendage of Anomalocaris from other localities. Tamisiocaris borealis n. gen. and n. sp. has an elongated appendage with paired spines along one margin, and differs from the frontal appendage of Anomalocaris in that segment boundaries are absent and ventral spines are relatively long and spineless. These differences may be taphonomic, but the entire surface of the appendage is covered in a fine fabric, making it unlikely that this appendage was originally segmented or sclerotized. the taxon is tentatively placed within Radiodonta, but this systematic placement cannot be confirmed while complete body specimens are lacking.

APA, Harvard, Vancouver, ISO, and other styles

12

Parry, Luke, Jakob Vinther, and Gregory D. Edgecombe. "Cambrian stem-group annelids and a metameric origin of the annelid head." Biology Letters 11, no. 10 (October 2015): 20150763. http://dx.doi.org/10.1098/rsbl.2015.0763.

Full text

Abstract:

The oldest fossil annelids come from the Early Cambrian Sirius Passet and Guanshan biotas and Middle Cambrian Burgess Shale. While these are among the best preserved polychaete fossils, their relationship to living taxa is contentious, having been interpreted either as members of extant clades or as a grade outside the crown group. New morphological observations from five Cambrian species include the oldest polychaete with head appendages, a new specimen of Pygocirrus from Sirius Passet, and an undescribed form from the Burgess Shale. We propose that the palps of Canadia are on an anterior segment bearing neuropodia and that the head of Phragmochaeta is formed of a segment bearing biramous parapodia and chaetae. The unusual anatomy of these taxa suggests that the head is not differentiated into a prostomium and peristomium, that palps are derived from a modified parapodium and that the annelid head was originally a parapodium-bearing segment. Canadia , Phragmochaeta and the Marble Canyon annelid share the presence of protective notochaetae, interpreted as a primitive character state subsequently lost in Pygocirrus and Burgessochaeta , in which the head is clearly differentiated from the trunk.

APA, Harvard, Vancouver, ISO, and other styles

13

Topper, Timothy P., Francesco Greco, Axel Hofmann, Andrew Beeby, and David A. T. Harper. "Characterization of kerogenous films and taphonomic modes of the Sirius Passet Lagerstätte, Greenland." Geology 46, no. 4 (February 15, 2018): 359–62. http://dx.doi.org/10.1130/g39930.1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Botting, Joseph P., Paco Cárdenas, and John S. Peel. "A crown-group demosponge from the early Cambrian Sirius Passet Biota, North Greenland." Palaeontology 58, no. 1 (October 20, 2014): 35–43. http://dx.doi.org/10.1111/pala.12133.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Peel, John S. "Mineralized gutfills from the Sirius Passet Lagerstätte (Cambrian Series 2) of North Greenland." GFF 139, no. 2 (December 2, 2016): 83–91. http://dx.doi.org/10.1080/11035897.2016.1260051.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Taylor, Rod S. "A New Bivalved Arthropod from the Early Cambrian Sirius Passet Fauna, North Greenland." Palaeontology 45, no. 1 (January 2002): 97–123. http://dx.doi.org/10.1111/1475-4983.00229.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Morris, Simon Conway, and John S. Peel. "New Palaeoscolecidan Worms from the Lower Cambrian: Sirius Passet, Latham Shale and Kinzers Shale." Acta Palaeontologica Polonica 55, no. 1 (March 2010): 141–56. http://dx.doi.org/10.4202/app.2009.0058.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Harper, David A. T., Emma U. Hammarlund, Timothy P. Topper, Arne T. Nielsen, Jan A. Rasmussen, Tae-Yoon S. Park, and M. Paul Smith. "The Sirius Passet Lagerstätte of North Greenland: a remote window on the Cambrian Explosion." Journal of the Geological Society 176, no. 6 (June 27, 2019): 1023–37. http://dx.doi.org/10.1144/jgs2019-043.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Morris, Simon Conway, and John S. Peel. "The Earliest Annelids: Lower Cambrian Polychaetes from the Sirius Passet Lagerstätte, Peary Land, North Greenland." Acta Palaeontologica Polonica 53, no. 1 (January 2008): 137–48. http://dx.doi.org/10.4202/app.2008.0110.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Budd, Graham E. "Ecology and Evolutionary Significance of the Sirius Passet Fauna Arthropods (Lower Cambrian of North Greenland)." Paleontological Society Special Publications 8 (1996): 53. http://dx.doi.org/10.1017/s2475262200000551.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Zhang, Xingliang, Jian Han, and Degan Shu. "A new arthropod Pygmaclypeatus daziensis from the Early Cambrian Chengjiang Lagerstätte, South China." Journal of Paleontology 74, no. 5 (September 2000): 979–82. http://dx.doi.org/10.1017/s0022336000033151.

Full text

Abstract:

The early Cambrian Chengjiang Lagerstatte, generally regarded as late Atdabanian (Qian and Bengtson, 1989; Bengtson et al., 1990), has become celebrated for perhaps the earliest biota of soft-bodied organisms known from the fossil record and has proven to be critical to our understanding of early metazoan evolution. The Sirius Passet fauna from Peary Land, North Greenland, another important repository of soft-bodied and poorly sclerotized fossils, was also claimed as Early Cambrian (Conway Morris et al., 1987; Budd, 1995). The exact stratigraphic position of the Sirius Passet fauna (Buen Formation) is still uncertain, although the possibility of late Atdabanian age was proposed (Vidal and Peel, 1993). Recent work dates it in the “Nevadella” Biozone (Budd and Peel, 1998). It therefore appears to be simultaneous with or perhaps slightly younger than Chengjiang Lagerstatte, Eoredlichia Biozone (Zhuravlev, 1995). The Emu Bay Shale of Kangaroo Island, South Australia, has long been famous as a source of magnificent specimens of the trilobites Redlichia takooensis and Hsunaspis bilobata. It is additionally important as the only site in Australia so far to yield a Burgess-Shale-type biota (Glaessner, 1979; Nedin, 1992). The Emu Bay Shale was considered late Early Cambrian in age (Daily, 1956; Öpik, 1975). But Zhang et al.(1980) reassessed its age based on data from the Chinese Early Cambrian. The occurrence of Redlichia takooensis and closely related species of Hsunaspis indicates an equivalence to the Tsanglangpuian in the Chinese sequence, and the contemporary South Australia fauna correlate with the Botomian of Siberia (Bengtson et al., 1990). Thus the Emu Bay Shale is younger than the upper Atdabanian Chengjiang Lagerstatte, Chiungchussuian.

APA, Harvard, Vancouver, ISO, and other styles

22

Budd, Graham E. "The morphology and phylogenetic significance ofKerygmachela kierkegaardiBudd (Buen Formation, Lower Cambrian, N Greenland)." Transactions of the Royal Society of Edinburgh: Earth Sciences 89, no. 4 (1998): 249–90. http://dx.doi.org/10.1017/s0263593300002418.

Full text

Abstract:

AbstractSpecimens ofKerygmachela kierkegaardiBudd are described, from the Lower Cambrian Sirius Passet fauna of N Greenland. The cephalic region is characterised by a pair of stout unsegmented appendages each bearing long spinose processes, and an anterior mouth. The trunk shows alternating rows of tubercles and transverse annulations along the axis, to which are attached 11 pairs of gill-bearing lateral lobes and lobopodous limbs. The caudal region is small, and bears two long tail spines. There is some evidence for circular musculature arranged around the trunk and a dorsal, longitudinal sinus, and several details of the muscular pharynx have been preserved.The combination of characters found inKerygmachelaallows it to be allied with the lobopods, represented in the extant fauna by the onychophorans, tardigrades, and possibly the pentastomids, and in the Cambrian fossil record by a morphologically diverse set of taxa, some of which are not assignable to the extant groupings. It also shares important characters with the previously problematic Burgess Shale formsOpabinia regalisWalcott andAnomalocarisWhiteaves, and the Sirius Passet form Pambdelurion Budd. These taxa together form a paraphyletic group at the base of the clade of biramous arthropods. The position of the so-called ‘Uniramia’ remains unclear. It can be demonstrated from the reconstruction of the arthropod stem-group that full arthropod segmentation has a different derivation from that of the annelids. In line with other recent analyses, this suggests that the ‘Articulata’ of Cuvier should be dismantled, and the arthropods considered to be a group of protostomes which are phylogenetically distinct from the classic spiralians. Arthropod affinities may rather lie with the other moulting animals, in the so-called ‘Ecdysozoa’.

APA, Harvard, Vancouver, ISO, and other styles

23

Nielsen, Morten Lunde, Jan Audun Rasmussen, and David A. T. Harper. "Sexual dimorphism within the stem-group arthropod Isoxys volucris from the Sirius Passet Lagerstätte, North Greenland." Bulletin of the Geological Society of Denmark 65 (May 6, 2017): 47–58. http://dx.doi.org/10.37570/bgsd-2017-65-04.

Full text

Abstract:

Morphometric analyses carried out on 126 specimens of the early Cambrian (Cambrian Series 2, Stage 3) stem-group arthropod Isoxys volucris from North Greenland reveal a bimodal distribution, where Morphogroup A is characterised by a significantly wider doublure than Morphogroup B. The dimorphism is interpreted as intraspecific variation related to gender (sexual dimorphism), where the relative numbers of individuals within the two morphogroups are equal (ratio 1:1). The discovery of established sexual dimorphism in Isoxys may have implications for the taxonomic discrimination of other stemgroup arthropods within the morphologically diverse and disparate animals of the early Cambrian.

APA, Harvard, Vancouver, ISO, and other styles

24

STEIN, MARTIN, JOHN S. PEEL, DAVID J. SIVETER, and MARK WILLIAMS. "Isoxys (Arthropoda) with preserved soft anatomy from the Sirius Passet Lagerstätte, lower Cambrian of North Greenland." Lethaia 43, no. 2 (September 7, 2009): 258–65. http://dx.doi.org/10.1111/j.1502-3931.2009.00189.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Vinther, Jakob, Danny Eibye-Jacobsen, and David A. T. Harper. "An Early Cambrian stem polychaete with pygidial cirri." Biology Letters 7, no. 6 (July 6, 2011): 929–32. http://dx.doi.org/10.1098/rsbl.2011.0592.

Full text

Abstract:

The oldest annelid fossils are polychaetes from the Cambrian Period. They are representatives of the annelid stem group and thus vital in any discussion of how we polarize the evolution of the crown group. Here, we describe a fossil polychaete from the Early Cambrian Sirius Passet fauna, Pygocirrus butyricampum gen. et sp. nov., with structures identified as pygidial cirri, which are recorded for the first time from Cambrian annelids. The body is slender and has biramous parapodia with chaetae organized in laterally oriented bundles. The presence of pygidial cirri is one of the characters that hitherto has defined the annelid crown group, which diversified during the Cambrian–Ordovician transition. The newly described fossil shows that this character had already developed within the total group by the Early Cambrian.

APA, Harvard, Vancouver, ISO, and other styles

26

Hammarlund, Emma U., M. Paul Smith, Jan A. Rasmussen, Arne T. Nielsen, Donald E. Canfield, and David A. T. Harper. "The Sirius Passet Lagerstätte of North Greenland-A geochemical window on early Cambrian low-oxygen environments and ecosystems." Geobiology 17, no. 1 (September 27, 2018): 12–26. http://dx.doi.org/10.1111/gbi.12315.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Mángano, M. Gabriela, Richard G. Bromley, David A. T. Harper, Arne T. Nielsen, M. Paul Smith, and Jakob Vinther. "Nonbiomineralized carapaces in Cambrian seafloor landscapes (Sirius Passet, Greenland): Opening a new window into early Phanerozoic benthic ecology." Geology 40, no. 6 (June 2012): 519–22. http://dx.doi.org/10.1130/g32853.1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Budd, Graham E. "Kleptothule rasmusseni gen. et sp. nov.: an ?olenellinid-like trilobite from the Sirius Passet fauna (Buen Formation, Lower Cambrian, North Greenland)." Transactions of the Royal Society of Edinburgh: Earth Sciences 86, no. 1 (1995): 1–12. http://dx.doi.org/10.1017/s0263593300002121.

Full text

Abstract:

AbstractThe Lower Cambrian Sirius Passet fauna from Peary Land, North Greenland, is a rich repository of soft-bodied and poorly-sclerotised fossils. A new arthropod from the fauna, Kleptothule rasmusseni, is described. The animal is broadly trilobite-like, possessing a trilobed exoskeleton which is divided into distinct cephalic, thoracic and caudal regions. However, it is unusual in that it possesses a large number of segments, and demonstrates pronounced cephalic segmentation, and a very narrow cephalon and thorax. There is some evidence that the exoskeleton was lightly mineralised.Kleptothule is compared to some of the olenellimd trilobites, especially those taxa that possess a many-segmented ‘opisthothorax’. Its morphology raises some issues discussed by Lauterbach (1983) in his assignment of some olenellids to the stem-group of the chelicerates. However, it is not considered herein that such a model can be supported. A complete analysis of basal trilobites and the stem-group leading to them must await a fuller description of key taxa from China and Greenland.

APA, Harvard, Vancouver, ISO, and other styles

29

VINTHER, JAKOB, M. PAUL SMITH, and DAVID A. T. HARPER. "Vetulicolians from the Lower Cambrian Sirius Passet Lagerstätte, North Greenland, and the polarity of morphological characters in basal deuterostomes." Palaeontology 54, no. 3 (May 2011): 711–19. http://dx.doi.org/10.1111/j.1475-4983.2011.01034.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Budd, Graham E. "A nektaspid arthropod from the Early Cambrian Sirius Passet fauna, with a description of retrodeformation based on functional morphology." Palaeontology 42, no. 1 (February 1999): 99–122. http://dx.doi.org/10.1111/1475-4983.00064.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Strang, Katie M., Howard A. Armstrong, David A. T. Harper, and João P. Trabucho-Alexandre. "The Sirius Passet Lagerstätte: silica death masking opens the window on the earliest matground community of the Cambrian explosion." Lethaia 49, no. 4 (April 19, 2016): 631–43. http://dx.doi.org/10.1111/let.12174.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Stein, Martin, Graham E. Budd, John S. Peel, and David AT Harper. "Arthroaspis n. gen., a common element of the Sirius Passet Lagerstätte (Cambrian, North Greenland), sheds light on trilobite ancestry." BMC Evolutionary Biology 13, no. 1 (2013): 99. http://dx.doi.org/10.1186/1471-2148-13-99.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

CONWAY MORRIS, S., D. McILROY, and A. W. A. RUSHTON. "Lower Cambrian halkieriids from Oxfordshire, UK." Geological Magazine 135, no. 4 (July 1998): 501–8. http://dx.doi.org/10.1017/s0016756898001198.

Full text

Abstract:

Lower Cambrian sediments from the Withycombe Farm borehole (Oxfordshire) yield isolated halkieriid sclerites. All bear prominent ridges, and most appear to be either cultrates or palmates, although distinction between the two in the available material is generally difficult. Two other sclerites are more elongate: one may represent a spinose sclerite, while the other is possibly derived from the siculate zone of the original scleritome. Adjacent horizons of the Withycombe Formation yield disc-like fossils, superficially similar to hyolith opercula or monoplacophorans. These are tentatively identified as deriving from the same halkieriid scleritome. Two main types are identified, and these may correspond to the anterior and posterior shells of Halkieria evangelista from the lower Cambrian Sirius Passet fauna of North Greenland. The age of the Withycombe Formation within the Cambrian is not entirely resolved, but faunal evidence suggests an equivalence to the Cuslett Formation of southeast Newfoundland, which corresponds to either the upper Tommotian or lower Atdabanian of the standard Siberian section.

APA, Harvard, Vancouver, ISO, and other styles

34

Budd, Graham E. "Campanamuta mantonaegen. et. sp. nov., an exceptionally preserved arthropod from the Sirius Passet Fauna (Buen Formation, lower Cambrian, North Greenland)." Journal of Systematic Palaeontology 9, no. 2 (June 2011): 217–60. http://dx.doi.org/10.1080/14772019.2010.492644.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Peel, John S. "Feeding behaviour of a new worm (Priapulida) from the Sirius Passet Lagerstätte (Cambrian Series 2, Stage 3) of North Greenland (Laurentia)." Palaeontology 60, no. 6 (July 21, 2017): 795–805. http://dx.doi.org/10.1111/pala.12316.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Strang, K. M., H. A. Armstrong, and D. A. T. Harper. "Minerals in the gut: scoping a Cambrian digestive system." Royal Society Open Science 3, no. 11 (November 2016): 160420. http://dx.doi.org/10.1098/rsos.160420.

Full text

Abstract:

The Sirius Passet Lagerstätte of North Greenland contains the first exceptionally preserved mat-ground community of the Cambrian, dominated, in terms of abundance, by trilobites but particularly characterized by iconic arthropods and lobopods, some also occurring in the Burgess shale. High-resolution photography, scanning electron imaging and elemental mapping have been carried out on a variety of specimens of the non-mineralized arthropod Campanamuta mantonae (Budd 2011 J. Syst. Palaeontol. 9 , 217–260 ( doi:10.1080/14772019.2010.492644 )) which has three-dimensional gut and muscle preservation. Results show that the guts contain a high concentration of calcium phosphate (approximating to the mineral francolite), whereas the adjacent muscles are silicified. This indicates a unique, tissue-specific taphonomy for this Cambrian taxon. We hypothesize that the precipitation of calcium phosphate in the guts occurs rapidly after death by ‘crystal seed’ processes in suboxic, slightly acidic conditions; critically, the gut wall remained intact during precipitation. We postulate that the calcium phosphate was derived from ingested cellular material. Silicification of the muscles followed as the localized water chemistry became saturated in silica, high in Fe 2+ , and low in oxygen and sulfate. We document here the unique occurrence of two distinct but mechanistically similar taphonomic pathways within a diverse suite of possibilities in an Early Cambrian Lagerstätte.

APA, Harvard, Vancouver, ISO, and other styles

37

Capdevila, D. Garcia-Bellido, and S. Conway Morris. "New fossil worms from the Lower Cambrian of the Kinzers Formation, Pennsylvania, with some comments on Burgess Shale-type preservation." Journal of Paleontology 73, no. 3 (May 1999): 394–402. http://dx.doi.org/10.1017/s0022336000027918.

Full text

Abstract:

Two new fossil worms are described from the Lower Cambrian Kinzers Formation of southeast Pennsylvania. Both are unique specimens. Kinzeria crinita new genus and species has a body divided into three regions. The head bears a prominent set of elongate tentacles, presumably employed for feeding. The elongate trunk tapers slightly in a posterior direction. It contains a prominent intestinal tract, the contents of which indicate a deposit feeding habit. The tail is an expanded structure, with either a spatulate or sagittate outline. The mode of life of K. crinita is uncertain, but the animal may have been semi-sedentary. Atalotaenia adela new genus and species is more poorly known, lacking the anterior. The preserved body is vermiform, with external annulations and a rounded posterior. There is a prominent internal strand, consisting of a probable intestine and an associated fibrous unit, possibly representing muscles. This worm may have been infaunal. These discoveries extend further our understanding of the ancient diversity of Laurentian Burgess Shale-type faunas. In common with the Burgess Shale itself and the Sirius Passet fauna (Peary Land, Greenland) the location of fossil-Lagerstätte [see Shields (1998) for a discussion of the terminology of Lagerstätten] of the Kinzers Formation adjacent to a prominent escarpment reinforces earlier evidence of the paleotopography exerting an important control on the distribution of Burgess Shale-type faunas. Whether this is a result of localized faunal abundances or taphonomic control is, however, uncertain.

APA, Harvard, Vancouver, ISO, and other styles

38

Schoenemann, Brigitte, and Euan N. K. Clarkson. "Vision in fossilised eyes." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 106, no. 4 (December 2015): 209–20. http://dx.doi.org/10.1017/s1755691016000232.

Full text

Abstract:

ABSTRACTThis paper presents a review of recent developments in the study of vision in fossil arthropods, beginning with a discussion of the origin of visual systems. A report of the eyes of Cambrian arthropods from different Lagerstätten, especially the compound and median arthropod eyes from the Chengjiang fauna of China, is given. Reference is made also to compound eyes from the lower Cambrian Emu Bay Shale fauna of Australia and the Sirius Passet fauna of Greenland; also to the three-dimensionally preserved ‘Orsten’ fauna of Sweden. An understanding of how these eyes functioned is possible by reference to living arthropods and by using physical tools developed by physiologists. The eyes of trilobites (lower Cambrian to Upper Permian) are often very well preserved, and the structure and physiology of their calcite lenses, and the eye as a whole, are summarised here, based upon recent literature. Two main kinds of trilobite eyes have been long known. Firstly, there is the holochroal type, in which the lenses are usually numerous, small and closely packed together; this represents the ancestral kind, first found in lowermost Cambrian trilobites. The second type is the schizochroal eye, in which the lenses are relatively much larger and each is separated from its neighbours. Such eyes are confined to the single suborder Phacopina (Lower Ordovician to Upper Devonian). This visual system has no real equivalents in the animal kingdom. In this present paper, the origin of schizochroal eyes, by paedomorphosis from holochroal precursors, is reviewed, together with subsequent evolutionary transitions in the Early Ordovician. A summary of new work on the structure and mineralogy of phacopid lenses is presented, as is a discussion of the recent discovery of sublensar sensory structures in Devonian phacopids, which has opened up new dimensions in the study of trilobite vision.

APA, Harvard, Vancouver, ISO, and other styles

39

Budd, Graham E. "Arthropods from North Greenland: exceptional data in the ‘Cambrian explosion’ debate." Paleontological Society Special Publications 6 (1992): 44. http://dx.doi.org/10.1017/s2475262200006043.

Full text

Abstract:

'Sirius Passet’ fauna arthropods from the Lower Cambrian Buen Formation of North Greenland form the major component of this exceptionally preserved biota. Early mineralisation of body cavities led to internal anatomy being preserved more readily than external structures such as limbs. Musculature and gut are known in three dimensional form. Many of the taxa present are more easily compared to extant arthropods than to flattened fossil material such as from the Burgess Shale.The most common arthropod is represented by some 1600 specimens. Although widely differing in preservational style, these specimens may be reconciled to provide a coherent model of the three-dimensional anatomy of the arthropod. The affinities of this arthropod lie with the ‘Cheliceromorph’ rather than the Crustacean biramous-limbed arthropods, and may represent a fairly advanced lineage within the clade.Recent discussions of the patterns produced by the early metazoan radiations have concentrated on data available from the Burgess Shale. The continuing discovery and description of other Cambrian lagerstätten such as from North Greenland and Chengjiang has highlighted the degree to which the Burgess Shale fauna should be considered to be an aliquot taken from the foment of the ‘Cambrian Explosion’. The discovery of more taxa is tending to flesh out the bare bones of the Burgess fauna. Conclusions about phylogentic patterns drawn from the Burgess Shale alone may thus be premature.Body patterning in the arthropods, and the validity of the ‘Bauplan’ concept may be investigated by consideration of the actual mechanisms available for profound morphological change. One promising route is provided by the ‘homeotic’ and other hierarchically arranged developmental genes. When the mode of action of these genes is considered in conjunction with phylogenetic methods, it may prove possible to assess evolutionary pathways in terms of the feasibility of the morphological changes required by them rather than relying on what seems inherently reasonable or on marginal advantages in parsimony. Exceptionally preserved biotas also contain the evidence for the evolution of the developmental mechanisms themselves.

APA, Harvard, Vancouver, ISO, and other styles

40

Butterfield, Nicholas J. "Leanchoilia guts and the interpretation of three-dimensional structures in Burgess Shale-type fossils." Paleobiology 28, no. 1 (2002): 155–71. http://dx.doi.org/10.1666/0094-8373(2002)028<0155:lgatio>2.0.co;2.

Full text

Abstract:

The Burgess Shale arthropod Leanchoilia superlata Walcott 1912, commonly preserves a three-dimensional axial structure generally interpreted as gut contents. Thin-section examination shows this instead to be phosphatized biserially repeated midgut glands, including exceptional preservation of subcellular features. The preferential mineralization of these structures is related to their unusually high chemical reactivity and probably to an internal source of phosphate. Sub-millimetric lineations previously interpreted as annular musculature are in fact planar, sometimes radially arranged, subdivisions of these glands. Ventral rows of isolated phosphate patches appear to represent the same tissue.In extant arthropods, extensively developed midgut glands are related to a rich but infrequent diet with a primary function in storage. Their conspicuous occurrence in unambiguous fossil predators such as Sidneyia and Laggania (Anomalocaris) suggests they served a similar role in the Cambrian; by extension, their conspicuous occurrence in Leanchoilia suggests it was a predator or scavenger.Phosphatized midguts with a structure essentially indistinguishable from that of Leanchoilia are also found in Burgess Shale Odaraia, Canadaspis, Perspicaris, Sidneyia, Anomalocaris, and Opabinia. All are characterized by a distinctive sub-millimetric arrangement of planar elements that is not found in extant arthropods or trilobites, suggesting they diverged before the last common ancestor of extant forms; i.e., they represent stem-group arthropods.Three-dimensionally preserved guts are widely preserved in the Lower Cambrian Chengjiang biota but, unlike those in the Burgess Shale, appear to be filled with sediment. Although generally interpreted as evidence of deposit feeding, the form of these structures points to early permineralization of (sediment-free) midgut glands that were subsequently altered to clay minerals. There is no evidence of deposit feeding in the Chengjiang; indeed, there is a case to be made for deposit feeding not being generally exploited generally until after the Cambrian.Fossils with three-dimensionally preserved axes from the Lower Cambrian Sirius Passet biota have been interpreted as lobopodians; however, most of the putative lobopodian features find alternative interpretations as aspects of Leanchoilia-type midgut glands. Although Kerygmachela is reliably identified as a stem-group arthropod, its phylogenetic position remains unresolved owing to the non-preservation of critical external features and to the plesiomorphic nature of its Leanchoilia-type midgut.

APA, Harvard, Vancouver, ISO, and other styles

41

Landstreet, John D., and Stefano Bagnulo. "Discovery of a Sirius-like binary system with a very strongly magnetic white dwarf." Astronomy & Astrophysics 634 (February 2020): L10. http://dx.doi.org/10.1051/0004-6361/201937301.

Full text

Abstract:

Non-interacting binary systems containing a magnetic white dwarf and a main-sequence star are considered extremely rare, perhaps non-existent. In the course of a search of magnetic fields in high-mass white dwarfs we have discovered a Sirius-like wide binary system composed of a main-sequence G0 star and an M ∼ 1.1 M⊙ white dwarf with a huge (hundreds of MG) magnetic field. This star, WDS J03038+0608B, shows a circular polarisation amplitude of 5% in the continuum, with no evidence of variability on a 1 d timescale, little or no linear polarisation in the blue part of the spectrum, and about 2% linear polarisation in the red part of the optical spectrum. A search in the literature reveals the existence of four more binary systems that include a magnetic white dwarf and a non-degenerate companion; three such systems passed unremarked in previous studies. We estimate that up to a few percent of magnetic white dwarfs may be found to occur in wide binary pairs. However, at least four of the five known binary systems with a magnetic white dwarf are too widely separated to be expected to evolve into systems experiencing Roche-lobe overflow, and cannot be considered as progenitors of magnetic cataclysmic variable (AM Her and DQ Her) systems.

APA, Harvard, Vancouver, ISO, and other styles

42

Holloway, Paul. ""Beguile your soul" (Sir xiv 16; xxx 23): An Epicurean eme in Ben Sira." Vetus Testamentum 58, no. 2 (2008): 219–34. http://dx.doi.org/10.1163/156853308x278671.

Full text

Abstract:

AbstractDuring the Hellenistic period, the different philosophical schools developed different theories and techniques of consolation. Epicurean technique called for distracting the mourner by pleasant memories and was widely practiced, even by those who were not philosophical hedonists. The technique was altered slightly as it passed into popular use, where in it came to be conceived as a kind of mental dissimulation or even as a therapeutic "beguiling" of the mind by any of a number of pleasant distractions. This forms the likely background to Ben Sira's advice to those confronting death at xiv 16 and xxx 23 to "beguile your soul," an observation that provides further evidence of Ben Sira's contact with and measured appropriation of Hellenistic intellectual culture.

APA, Harvard, Vancouver, ISO, and other styles

43

Putra, Eldha Nur Ramadhana, Edi Prihartono, and Budi Santoso. "Traffic Light Automation with Camera Tracker and Microphone to Recognize Ambulance Using the HAAR Cascade Classifier Method." International Journal of Artificial Intelligence & Robotics (IJAIR) 2, no. 2 (December 1, 2020): 70. http://dx.doi.org/10.25139/ijair.v2i2.3194.

Full text

Abstract:

Lack of knowledge by road users regarding these priorities, especially when there is a passing ambulance that is often stuck in traffic at a crossroads due to accumulated vehicles and the traffic light is still red. The purpose of this paper is to simulate traffic light automation by giving a green light every time an ambulance passes by using the HAAR and Computer Vision methods. The HAAR method is used for training data from less sharp images as part of the Ambulance object classification process. The Computer Vision method is used as a tool in image processing objects to processing the image captured by the Camera. Hardware through the microphone performs pattern recognition to pick up ambulance sirens. The test result at the average frequency caught by the microphone is 1.3 kHz. The test results of the System to capture ambulance objects received a precision value of 75%, a recall of 100%, and an accuracy of 75%.

APA, Harvard, Vancouver, ISO, and other styles

44

Blakeley, Matthew P., Samar S. Hasnain, and Svetlana V. Antonyuk. "Sub-atomic resolution X-ray crystallography and neutron crystallography: promise, challenges and potential." IUCrJ 2, no. 4 (June 30, 2015): 464–74. http://dx.doi.org/10.1107/s2052252515011239.

Full text

Abstract:

The International Year of Crystallography saw the number of macromolecular structures deposited in the Protein Data Bank cross the 100000 mark, with more than 90000 of these provided by X-ray crystallography. The number of X-ray structures determined to sub-atomic resolution (i.e.≤1 Å) has passed 600 and this is likely to continue to grow rapidly with diffraction-limited synchrotron radiation sources such as MAX-IV (Sweden) and Sirius (Brazil) under construction. A dozen X-ray structures have been deposited to ultra-high resolution (i.e.≤0.7 Å), for which precise electron density can be exploited to obtain charge density and provide information on the bonding character of catalytic or electron transfer sites. Although the development of neutron macromolecular crystallography over the years has been far less pronounced, and its application much less widespread, the availability of new and improved instrumentation, combined with dedicated deuteration facilities, are beginning to transform the field. Of the 83 macromolecular structures deposited with neutron diffraction data, more than half (49/83, 59%) were released since 2010. Sub-mm3crystals are now regularly being used for data collection, structures have been determined to atomic resolution for a few small proteins, and much larger unit-cell systems (cell edges >100 Å) are being successfully studied. While some details relating to H-atom positions are tractable with X-ray crystallography at sub-atomic resolution, the mobility of certain H atoms precludes them from being located. In addition, highly polarized H atoms and protons (H+) remain invisible with X-rays. Moreover, the majority of X-ray structures are determined from cryo-cooled crystals at 100 K, and, although radiation damage can be strongly controlled, especially since the advent of shutterless fast detectors, and by using limited doses and crystal translation at micro-focus beams, radiation damage can still take place. Neutron crystallography therefore remains the only approach where diffraction data can be collected at room temperature without radiation damage issues and the only approach to locate mobile or highly polarized H atoms and protons. Here a review of the current status of sub-atomic X-ray and neutron macromolecular crystallography is given and future prospects for combined approaches are outlined. New results from two metalloproteins, copper nitrite reductase and cytochromec′, are also included, which illustrate the type of information that can be obtained from sub-atomic-resolution (∼0.8 Å) X-ray structures, while also highlighting the need for complementary neutron studies that can provide details of H atoms not provided by X-ray crystallography.

APA, Harvard, Vancouver, ISO, and other styles

45

Puspita, Kumara, Samriananda Septiyani, and I. Gde Sandy Satria. "EFEKTIVITAS TIM ESCORT SEBAGAI PEMBUKA JALAN AMBULANS DI INDONESIA." Jurnal Hukum Bisnis Bonum Commune 3, no. 2 (July 22, 2020): 189–200. http://dx.doi.org/10.30996/jhbbc.v3i2.3576.

Full text

Abstract:

AbstractThis study aims to identify the formation of the escort team community and the important role of the ambulance escort. Research methods used by researchers are empirical studies by obtaining live data from interviews via social media with escort teams and communities in Indonesia. Research on the role of escort team helps the ambulance travel quickly to the assigned hospital. Early in the development of the escort team in Indonesia, due to people's indifference to the presence of ambulances when the ambulance sirens went off, this caused patients to bet their lives on the streets. Several communities and police departments disagreed on the escort team's presence, as it was in the interest of security and order in police traffic that had the authority to escort ambulances. In this case the host team helps the ambulance, since the ambulance asks escort teams to escort ambulances, for a definite decision or discrete of the police force to provide a specific clearance for the escort team's communities.Keywords: ambulance escort; escort team community; roleAbstrakPenelitian ini bertujuan untuk mengetahui awal terbentuknya komunitas tim escort dan peranan penting dalam melakukan pengawalan ambulans. Metode penelitian yang digunakan peneliti adalah penelitian empiris dengan cara memperoleh data langsung dari hasil wawancara melalui media sosial dengan pihak tim escort dan masyarakat di Indonesia. Melalui penelitian ini peneliti peranan tim escort dapat membantu perjalanan ambulans agar cepat sampai ke rumah sakit yang dituju. Pada awal terbentuknya komunitas tim escort di Indonesia, disebabkan karena ketidakpedulian masyarakat akan keberadaan ambulans ketika sirine ambulans berbunyi, hal ini yang menyebabkan pasien bertaruh nyawa di jalan. Beberapa masyarakat dan pihak kepolisan tidak setuju akan keberadaan komunitas tim escort, karena demi keamanan dan ketertiban dalam berlalu lintas pihak kepolisian yang memiliki wewenang untuk melakukan pengawalan ambulans. Dalam hal ini keberadaan komunitas tim escort sangat membantu pihak ambulans, karena pihak ambulans yang meminta tim escort untuk mengawal ambulans, supaya adanya kepastian diperlukan keputusan atau diskresi kepolisian agar memberikan ketegasan berupa izin khusus untuk komunitas tim escort dalam melakukan pengawalan ambulans.Kata kunci: komunitas tim escort; pengawalan ambulans; peranan

APA, Harvard, Vancouver, ISO, and other styles

46

Peel, J. S., and J. R. Ineson. "The extent of the Sirius Passet Lagerstätte (early Cambrian) of North Greenland." Bulletin of Geosciences, July 28, 2011, 535–43. http://dx.doi.org/10.3140/bull.geosci.1269.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Nielsen, Morten Lunde, Mirinae Lee, Hong Chin Ng, Jeremy C. Rushton, Katharine R. Hendry, Ji-Hoon Kihm, Arne T. Nielsen, Tae-Yoon S. Park, Jakob Vinther, and Philip R. Wilby. "Metamorphism obscures primary taphonomic pathways in the early Cambrian Sirius Passet Lagerstätte, North Greenland." Geology, September 20, 2021. http://dx.doi.org/10.1130/g48906.1.

Full text

Abstract:

Correct interpretation of soft-bodied fossils relies on a thorough understanding of their taphonomy. While the focus has often been on the primary roles of decay and early diagenesis, the impacts of deeper burial and metamorphism on fossil preservation are less well understood. We document a sequence of late-stage mineral replacements in panarthropod fossils from the Sirius Passet Lagerstätte (North Greenland), an important early Cambrian Burgess Shale–type (BST) biota. Muscle and gut diverticula were initially stabilized by early diagenetic apatite, prior to being pervasively replaced by quartz and then subordinate chlorite, muscovite, and chloritoid during very low- to low-grade metamorphism. Each new mineral replicates the soft tissues with different precision and occurs in particular anatomical regions, imposing strong biases on the biological information retained. Muscovite and chloritoid largely obliterate the tissues’ original detail, suggesting that aluminum-rich protoliths may have least potential for conserving mineralized soft tissues in metamorphism. Overall, the fossils exhibit a marked shift toward mineralogical equilibration with the matrix, obscuring primary taphonomic modes. Sequential replacement of the phosphatized soft tissues released phosphorus to form new accessory monazite (and apatite and xenotime), whose presence in other BST biotas might signal the prior, more widespread, occurrence of this primary mode of preservation. Our results provide critical context for interpreting the Sirius Passet biota and for identifying late-stage overprints in other biotas.

APA, Harvard, Vancouver, ISO, and other styles

48

Peel, J. S., and M. Stein. "A new arthropod from the lower Cambrian Sirius Passet Fossil-Lagerstätte of North Greenland." Bulletin of Geosciences, December 31, 2009, 625–30. http://dx.doi.org/10.3140/bull.geosci.1158.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Peel, J. S. "Articulated hyoliths and other fossils from the Sirius Passet Lagerstätte (early Cambrian) of North Greenland." Bulletin of Geosciences, September 30, 2010, 385–94. http://dx.doi.org/10.3140/bull.geosci.1207.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Peel, J. S. "Molaria (Euarthropoda) from the Sirius Passet Lagerstätte (Cambrian Series 2, Stage 3) of North Greenland." Bulletin of Geosciences, June 30, 2017, 133–42. http://dx.doi.org/10.3140/bull.geosci.1658.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Sirius Passet'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles