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330 results for “Upper Triassic”
Fig. 1 in Postcranial Osteology Of Azendohsaurus Madagaskarensis (?Middle To Upper Triassic, Isalo Group, Madagascar) And Its Systematic Position Among Stem Archosaur Reptiles
Fig. 1. Skeletal reconstruction of Azendohsaurus madagaskarensis.
Data from: Bivalves from the Changhsingian (Upper Permian) Bellerophon Formation of the Dolomites (Italy): ancestors of the Lower Triassic post extinction benthic communities
<p><span>The diverse shallow marine fossil assemblages from the Changhsingian Bellerophon Formation of the Dolomites record the late Palaeozoic marine life immediately before the end-Permian mass extinction. Here, based on the collection of c. 6500 bivalve specimens from different localities of the western Dolomites, we have taxonomically classified 26 species, including 10 new species, 3 new genera and 1 new family: <em>Acharax</em> <em>frenademezi</em> sp. nov., <em>Bakevellia</em> (<em>Bakevellia</em>) <em>preromangica</em> sp. nov., <em>Edmondia</em> <em>hautmanni</em> sp. nov., <em>Etheripecten</em> <em>stuflesseri</em> sp. nov., <em>Ladinomya</em> <em>fosteri</em> gen. et sp. nov., <em>Lovaralucina</em> <em>covidi</em> gen. et sp. nov., <em>Palaeolima</em> <em>badiotica</em> sp. nov., <em>Promytilus</em> <em>merlai</em> sp. nov., <em>Tambanella</em>? <em>stetteneckensis</em> sp. nov., <em>Volsellina</em> <em>carinata</em> sp. nov., <em>Gardenapecten</em> gen. nov., Ladinomyidae fam. nov. </span><span>The occurrence of three <em>Eumorphotis</em> species with a different and superimposed stratigraphic distribution led us to propose an upper Permian 'lower <em>Eumorphotis</em> Zone' in contrast to the already known Lower Triassic <em>Eumorphotis</em> Zone which is consequently renamed as 'upper <em>Eumorphotis</em> Zone'. The 'lower <em>Eumorphotis</em> Zone' is divided, in ascending stratigraphic order, into <em>E. praecurrens</em>, <em>E. striatocostata</em> and <em>E. lorigae</em> subzones. </span><span>A palaeoecological analysis of the bivalves contained in each sampled bed has allowed us to recognize 6 biofacies and 4 ecofacies, based on richness, dominance and ecological lifestyle. The bivalves from Bellerophon Formation inhabited lagoonal to nearshore environments affected by stressed conditions, mostly represented by high temperatures, high salinity, shallow water depths, low oxygen and high terrigenous input. The upper Bellerophon Fm is characterized by increasing fully marine conditions, although the occurrence of eurytopic taxa still suggests stressed marine conditions.</span></p>
Data from: A new sphenodontian (Diapsida: Lepidosauria) from the Upper Triassic of Germany and its implications for the mode of sphenodontian evolution
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Data from: Puercosuchus traverorum n. gen. and sp.: a new malerisaurine azendohsaurid (Archosauromorpha: Allokotosauria) from two monodominant bonebeds in the Chinle Formation (Upper Triassic, Norian) of Arizona
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Cranial morphology of a new phytosaur (Diapsida, Archosauria) from the Upper Triassic of India: implications for phytosaur phylogeny and biostratigraphy
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Data from: A new hybodont shark (Chondrichthyes, Elasmobranchii) from the Upper Triassic Tiki Formation of India with remarks on its dental histology and biostratigraphy
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Data from: Bivalves from the Changhsingian (Upper Permian) Bellerophon Formation of the Dolomites (Italy): ancestors of the Lower Triassic post extinction benthic communities
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Cranial anatomy, intraspecific variation, and positional variation within Calyptosuchus wellesi (Pseudosuchia: Aetosauria) based on new specimens from the Upper Triassic Chinle Formation (Adamanian, early middle-Norian) of Petrified Forest National Park, Arizona, USA
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FIGURE 3. A in A new comb-star (Asteroidea, Astropectinidae) from the Upper Triassic (Carnian) of China
FIGURE 3. A, First occurrence of selected neoasteroid orders and families (data from Gale 2011, 2018). B, stratigraphically calibrated consensus tree from Gale (2011, text-fig. 27), showing that the order of first occurrences matches the topology of the tree. This is a strict consensus tree, unconstrained simultaneous analysis, default outgroup, optimised to deltran, based on morphological characters.
FIGURE 2. A–H in A new comb-star (Asteroidea, Astropectinidae) from the Upper Triassic (Carnian) of China
FIGURE 2. A–H, Eoastropecten sechuanensis gen. et sp. nov., marginal ossicles. A, E, holotype superomarginal in abactinal (A) and proximal (E) view (MHI2183/1). B, paratype superomarginal in proximal/distal view (MHI2183/6). C, D, paratype inferomarginal in actinal (C) and distal (D) views (MHI2183/3). B, paratype superomarginal in proximal/distal views (MHI2183/2). F–H, paratype superomarginals in abactinal view (MHI2183/4, /5). I, unidentified astropectind superomarginal in abactinal view (NHMUK EE 17700). J, astropectinid superomarginal in abactinal view (NHMUK PI EE 17701). K, L, marginals of living astropectinid Craspidaster hesperus (Müller & Troschel, 1840), J, superomarginal in abactinal view. K, L, supero-inferomarginal pair. A–H, Maantang Formation (Carnian, Triassic), sample C30, Jiancougou, Sechuan Province, China. I, Lower Oxfordian, Andelot-Morval, Départment du Jura, France. J–L, Recent, Hong Kong.
FIGURE 1. Astropectinid morphology. A, B in A new comb-star (Asteroidea, Astropectinidae) from the Upper Triassic (Carnian) of China
FIGURE 1. Astropectinid morphology. A, B, Coulonia reidi (Blake & Reid, 1998), interradial fragment NHMUK PI EE 17699). A, abactinal surface, to show paxillae and superomarginals with intervening intermarginal fascioles. B, actinal surface, to show inferomarginal ossicles and imbricating actinal plates, in rows separated by grooves representing extensions of the intermarginal fascioles towards the ambulacral groove. C, Tethyaster sp. actinal surface, denuded of spines and smaller ossicles. Note the deep intermarginal fascioles, and the grooves extending across the actinal surface to the ambulacral groove. A.S. Gale Collection. A, B, Grayson Formation, Graysonites wacoense Zone, Cenomanian, Dottie Lynn Lane, Fort Worth, Texas, USA. C, present day, North Atlantic.
Data from: Lycopsid megaspores from the Upper Triassic of Svalbard and their relationship to the floras and palaeoenvironments of northern Pangaea
Triassic megaspore assemblages from Svalbard, Arctic Norway, are described for the first time based on the analysis of the Upper Triassic (Carnian–Norian/Rhaetian) Kapp Toscana Group on the island of Hopen. Two megaspore zones are described: the late Carnian 'Dijkstraisporites beutleri Zone' (undifferentiated De Geerdalen Formation), and the Norian/Rhaetian 'D. beutleri – Verrutriletes preutilis Zone' (Svenskøya Formation). Megaspores are attributed to heterosporous lycopsids, and likely correspond to the microspore Aratrisporites, which was observed in palynological preparations. Megaspore occurrence was highest in delta-plain and associated with lake-mire deposits. However, their close association with marine microfossils suggests episodic marine influence, and is consistent with previous interpretations that some Triassic lycopsids occupied marginal marine habitats. The absence of megaspores in the overlying Hopen Member and Flatsalen Formation is likely related to a marine transgression during the early Norian, as indicated by the recovery of low diversity assemblages of agglutinated foraminifera. The transition to ostracod-dominated microfaunas in the middle part of the formation is consistent with a regionally extensive maximum flooding surface, prior to a return to megaspore-dominated assemblages in the fluvio-deltaic deposits of the Svenskøya Formation. Despite the abundance of their mega- and microspores, lycopsid fossils are almost entirely absent within palaeobotanical collections from the island, which we ascribe to their herbaceous habit and consequent low preservation potential. The results of this study show lycopsids to be an important component of the local ecosystem and thus contribute to a more complete understanding of the Late Triassic floras of northern-most Pangaea.
Data from: A new ammonoid fauna from the Carnian (Upper Triassic) Kasimlar Formation of the Taurus Mountains (Anatolia, Turkey)
We describe a new ammonoid fauna from the Taurus Mountains of southern Turkey. The Carnian ammonoid fauna from Aşağiyaylabel is presented for the first time. Ammonoids were obtained from limestone to marl beds of an approximately 35-m-thick section, which depicts the scarce possibility to investigate ammonoid faunas across the Lower–Upper Carnian boundary. Intense sampling near the village of Aşağiyaylabel led to the recognition of a new Lower Carnian (Julian 2) to Upper Carnian (Tuvalian 1) ammonoid fauna from the Kasimlar Formation. The genus Kasimlarceltites gen. nov. is reported for the first time from the Taurus Mountains, which represents the main faunal element and occurs as huge mass occurrence (n >> 1 million). Kasimlarceltites krystyni gen. et sp. nov., Klipsteinia disciformis sp. nov. and Anasirenites crassicrenulatus sp. nov. occur within the Lower Carnian Carbonate member (Unit A–B) of the Kasimlar Formation from the Taurus Platform Units. Ammonoids described from the marls of the Tuvalian Marlstone member were deposited during a major, Tethyan–wide climate crisis – the so-called Carnian Crisis – characterized by a demise of carbonate platforms. Based on the biostratigraphic relevance of certain ammonoid taxa described herein, the age of the analyzed parts of the Kasimlar Formation is Julian 2 to Tuvalian 1. The discovery of the new ammonoid assemblages from Aşağiyaylabel substantiates the significance of Upper Triassic faunas within the Taurus Mountains and facilitates the correlation with faunal assemblages from other regions in the Tethyan Realm. The ammonoid fauna and facies indicate a general deepening from open platform margins, over deeper shelf settings down to an open marine-influenced basinal environment. The tentative habitat for Kasimlarceltites gen. nov. is a shallow platform environment to upper mid ramp.
FIGURE 37 in A new aetosaur from the Upper Triassic of the Santa Maria Formation, southern Brazil
FIGURE 37. Strict consensus tree recovered in the present analysis. Note the unresolved polytomies among basal stagonolepidids, and also sister group relationship between Polesinesuchus plus Aetobarbakinoides and Desmatosuchinae plus Typothoracisinae.
FIGURE 36 in A new aetosaur from the Upper Triassic of the Santa Maria Formation, southern Brazil
FIGURE 36. The second tree recovered in the present analysis. Note the position of Polesinesuchus as sister group of the Aetobarbakinoides and the sister group relationship between them, Desmatosuchinae plus Typothoracisinae.
FIGURE 35 in A new aetosaur from the Upper Triassic of the Santa Maria Formation, southern Brazil
FIGURE 35. The first most parsimonious tree of 67 steps and consistency index of 0,686 recovered in the analysis. Note the position of Polesinesuchus as sister group of the Aetobarbakinoides, and the sister group relationship between them and Desmatosuchinae plus Typothoracisinae.
FIGURE 34 in A new aetosaur from the Upper Triassic of the Santa Maria Formation, southern Brazil
FIGURE 34. Ventral osteoderms of Polesinesuchus aurelioi holotype (ULBRAPVT003) in A–D. Abbreviation: ab, anterior bar. Scale bar equals 10mm.
FIGURE 33 in A new aetosaur from the Upper Triassic of the Santa Maria Formation, southern Brazil
FIGURE 33. Left cervical paramedian osteoderm (A); right paramedian osteoderm (B) and (C) right posterior osteoderm of Polesinesuchus aurelioi holotype (ULBRAPVT003) in A, dorsal view; B, anterior view and C, posterior view. Abbreviations: ab, anterior bar; de, dorsal eminence; vin, ventral inflexion. Scale bar equals 10mm.
FIGURE 27 in A new aetosaur from the Upper Triassic of the Santa Maria Formation, southern Brazil
FIGURE 27. Left fibula Polesinesuchus aurelioi holotype (ULBRAPVT003) in A, lateral view; B, medial view; C, anterior view and D, posterior view. Abbreviation: tif, trochanter for iliofibulares muscle. Scale bar equals 10mm.
FIGURE 11 in A new aetosaur from the Upper Triassic of the Santa Maria Formation, southern Brazil
FIGURE 11. The thirteenth (?) dorsal vertebra of the Polesinesuchus aurelioi holotype (ULBRAPVT003) in A, anterior view; B, posterior view; C, right lateral view; D left lateral view; E, dorsal view and F, ventral view. Abbreviations: dp, diapophysis; nc, neural canal; ns, neural spine; pp, parapophysis; poz, postzygapophysis; prz, prezygapophysis; psf, post spinal fossa. Scale bar equals 10mm.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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