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60 results for “Toarcian”
Fig. 1. Early Jurassic map illustrating the previously studied areas for ventrally damaged ammonoids. 1 in Low durophagous predation on Toarcian (Early Jurassic) ammonoids in the northwestern Panthalassa shelf basin
Fig. 1. Early Jurassic map illustrating the previously studied areas for ventrally damaged ammonoids. 1, Dotternhausen, Germany (Taverne 2000; Klompmaker et al. 2009); 2, Lyme Regis, England (Andrew et al. 2010). The Toyora area was located in the northwestern part of the Panthalassa. Palaeogeographical map after Scotese (2001).
Fig. 7 in Low durophagous predation on Toarcian (Early Jurassic) ammonoids in the northwestern Panthalassa shelf basin
Fig. 7. Size distribution of ventrally intact and damaged early Toarcian ammonoid specimens from the Toyora area. Percentage represents the breakage frequency in each size class.
Fig. 3 in A new vent-related foraminifer from the lower Toarcian black claystone of the Tatra Mountains, Poland
Fig. 3. Ammosphaeroidinid foraminifer Recurvoides infernus sp. nov., holotype, UJ 213 P1, Huciański Klin, Tatra Mountains, sample 3236 (4.8b/1m), Toarcian, wet specimen in reflected light. Original microphotographs with highlighted chambers (A, B) and outline drawings (C), in pseudospiral (A1–C1), peripheral (A2–C2), and side (A3–C3) views.
Fig. 4 in A new vent-related foraminifer from the lower Toarcian black claystone of the Tatra Mountains, Poland
Fig. 4. Variability of ammosphaeroidinid foraminifer Recurvoides infernus sp. nov., Huciański Klin, Tatra Mts., Toarcian. A. Paratype, UJ 213 P2 (see Fig. 5J for rollogram), sample 3236 (4.8b/1m), in pseudospiral (A1), peripheral (A2), and side (A3) views. B. Paratype, UJ 213 P3 (see Fig. 5B for rollogram), sample 3213 (4.8b/16m), in pseudospiral (B1), peripheral (B2), and side (B3) views. C. Paratype, UJ 213 P4 (see Fig. 5U for rollogram), sample 3237 (4.8a/7.5m), in pseudospiral (C1), peripheral (C2), and side (C3) views. D. Test infilled with pyrite, sample 3236 (4.8b/1m), in pseudospiral (D1–D4), peripheral (D5), and apertural (D6) views; D1, dry specimen in reflected light; D2, wet in reflected light; D3, wet in transmitted light; D4–D6 SEM photographs. E. Strongly compressed specimen, sample 3236 (4.8b/1m), in side (E1, E3) and peripheral (E2) views; E1, specimen in reflected light; E2, E3 SEM photographs.
Fig. 5 in A new vent-related foraminifer from the lower Toarcian black claystone of the Tatra Mountains, Poland
Fig. 5. Variability of ammosphaeroidinid foraminifer Recurvoides infernus sp. nov., Huciański Klin, Tatra Mts., Toarcian. A–E, W. Sample 3213 (4.8b/16m). B. Paratype, UJ 213 P3. F–Q. Sample 3236 (4.8b/1m). F. Holotype, UJ 213 P1 (see Fig. 3). J. Paratype, UJ 213 P2. R–V, X–Z. Sample 3237 (4.8a/7.5m). U. Paratype, UJ 213 P4 (see Fig. 4B, A, C, respectively). Explanation for rollograms (coiling diagrams): a, position of aperture; b, chamber visible on the test surface; c, chamber covered by the younger coiling; d, chamber partly visible.
Fig. 2. A in A new vent-related foraminifer from the lower Toarcian black claystone of the Tatra Mountains, Poland
Fig. 2. A. Lithostratigraphic log of the Lower–Middle Jurassic rocks of the Krížna unit in the Western Tatra Mountains (after Lefeld et al. 1985). B. Lithological sections of the Mn−bearing sequence at the Huciański Klin crest and a photograph from the adit no. 4 described in detail in Jach (2002).
Fig. 1 in A new vent-related foraminifer from the lower Toarcian black claystone of the Tatra Mountains, Poland
Fig. 1. Geological sketch map of the Polish part of the Western Tatra Mountains (after Bac−Moszaszwili et al. 1979, simplified) showing the location of Huciański Klin sections.
Fig. 2 in A new plesiosauroid from the Toarcian (Lower Jurassic) of Alhadas, Portugal
Fig. 2. Details of the rear of the palate and basicranium of the plesiosauroid Lusonectes sauvagei gen. et sp. nov. (MG33) from the Toarcian of Portugal. A. Ventral view, indicating the path of a parasphenoid–basisphenoid suture. B. The flat (unkeeled) surface of the parasphenoid/basisphenoid between the posterior interpterygoid vacuities. C. The extent of the basisphenoid to enclose the posterior margins of the posterior interpterygoid vacuities. The parasphenoid cultriform process is 24 mm long.
Fig. 1 in A new plesiosauroid from the Toarcian (Lower Jurassic) of Alhadas, Portugal
Fig. 1. Skull of the plesiosauroid Lusonectes sauvagei gen et sp. nov. (MG33) from the Toarcian of Portugal, in right lateral (A), left lateral (B), dorsal (C), and ventral (D) views. Photographs (A1–D1), explanatory drawings (A2–D2).
Fig. 4. Strict consensus cladogram resulting from a in A new plesiosauroid from the Toarcian (Lower Jurassic) of Alhadas, Portugal
Fig. 4. Strict consensus cladogram resulting from a reanalysis of the data matrix of Grossmann (2007), with Lusonectes included as an additional operational taxonomic unit. See text for interpretation. SMNS16812 is the holotype of "Plesiopterys wildii" = Seeleyosaurus according to Grossman (2007).
Fig. 3 in A new plesiosauroid from the Toarcian (Lower Jurassic) of Alhadas, Portugal
Fig. 3. Comparative illustration of key anatomical areas of the skull in several Lower Jurassic plesiosauroids. A. Plesiosaurus (redrawn from Storrs 1997). B. Seeleyosaurus (redrawn from Grossmann 2007). C. Occitanosaurus (based on Bardet et al. 1999). D. Hydrorion (based on Maisch and Rücklin 2000; Grossmann 2006). E. Microcleidus (based on BMNH 36184, AS personal observation). F. Lusonectes sauvagei gen. et sp. nov. An alternative interpretation of Occitanosaurus suggests that the pterygoids met on the midline behind the posterior interpterygoid vacuity (Mark Evans, personal communication 2010). A1–F1,ventral surface of the braincase; A2–F2, lateral view of the cheek region (with the jugal highlighted in grey; anterior to the left). Not to scale.
FIG. 2 in Revised stratigraphic range of the Toarcian ammonite genus Porpoceras Buckman, 1911
FIG. 2. — Simplified map of the Early and Middle Toarcian up to the Variabilis subzone in the Thouars area (Western France). Modified after Bécaud (2006).
FIG. 3. — A in Revised stratigraphic range of the Toarcian ammonite genus Porpoceras Buckman, 1911
FIG. 3. — A, Stratigraphic succession of Middle Toarcian beds in the Airvault quarry; B, close-up view of the upper part of the Variabilis subzone in the Airvault quarry, with a Porpoceras specimen (UBGD 279076, see Fig. 5A) in situ indicated with a circle.
FIG. 5. — A, B in Revised stratigraphic range of the Toarcian ammonite genus Porpoceras Buckman, 1911
FIG. 5. — A, B, Specimens of Porpoceras gr. vortex (Simpson, 1855) -verticosum Buckman, 1914 from the Variabilis Subzone of the Airvault quarry; A, UBGD 279076; B, UBGD 279077; C, specimen UBGD 279075 of Porpoceras gr. vortex-verticosum from the Bifrons Horizon of the Belmont quarry. Scale bars: 10 mm.
FIG. 4. — A in Revised stratigraphic range of the Toarcian ammonite genus Porpoceras Buckman, 1911
FIG. 4. — A, Hildoceras sublevisoni Fucini, 1919 (UBGD 279080, Sublevisoni Subzone, Airvault); B-H, Porpoceras gr. vortex (Simpson, 1855) -verticosum Buckman, 1914 (B-E, UBGD 279078, Bifrons Horizon, Airvault; F-H, UBGD 279079, Bifrons Horizon, Airvault); I, Hildoceras bifrons (Bruguière, 1789) (UBGD 279081), Bifrons Horizon, Airvault); J, Haugia variabilis (d'Orbigny, 1844) (UBGD 279082), Variabilis subzone, Airvault). Scale bars: 10 mm.
Fig. 3 in Diversity dynamics of Early-Middle Jurassic brachiopods of Caucasus, and the Pliensbachian-Toarcian mass extinction
Fig. 3. Total species diversity changes, origination and extinction rates of NW Caucasus brachiopods in Early–Middle Jurassic.
Data from: Upper Toarcian (Lower Jurassic) marine gastropods from the Cleveland Basin, England: systematics, palaeobiogeography and contribution to biotic recovery from the early Toarcian extinction event
<p>Here we describe a new late Toarcian (Lower Jurassic) marine gastropod fauna from rocks of the Cleveland Basin exposed on the North Yorkshire coast of England. The fossil assemblage comprises sixteen species, of which three are new: <i>Katosira</i>? <i>bicarinata</i> sp. nov., <i>Turritelloidea</i> <i>stepheni</i> sp. nov. and <i>Striactaenonina elegans</i> sp. nov. Four species are described in open nomenclature as <i>Tricarilda</i>? sp., <i>Jurilda</i> sp., <i>Cylindrobullina </i>sp. and <i>Cossmannina</i> sp. The other species have previously been described: <i>Coelodiscus minutus </i>(Schübler <i>in </i>Zieten), <i>Procerithium quadrilineatum </i>(Römer), <i>Pseudokatosira</i> <i>undulata</i> (Benz in von Zieten), <i>Palaeorissoina </i>aff.<i> acuminata</i><i> </i>(Gründel, 1999b), <i>Pietteia</i> <i>unicarinata</i> (Hudleston), <i>Globularia</i> cf. <i>canina</i> (Hudleston), <i>Striactaeonina</i> cf. <i>richterorum </i>Schulbert & Nützel, <i>Striactaenonina </i>aff.<i> tenuistriata </i>(Hudleston) and <i>Sulcoactaeon</i> <i>sedgvici </i>(Phillips). Most of these species are the earliest records of their respective genera and show palaeobiogeographical connections with contemporary gastropod associations from other regions of Europe and South America. The taxonomic composition of the late Toarcian Cleveland Basin gastropod assemblage differs substantially from the faunas of the late Pliensbachian and early Toarcian <i>Tenuicostatum</i> Zone, showing the strong effect of the early Toarcian mass extinction event on the marine gastropod communities in the basin. Only a few gastropod species are shared between the late Toarcian faunas and the much more diverse Aalenian gastropod faunas in the Cleveland Basin, suggesting there was a facies control on gastropod occurrences at that time. This is also a potential explanation for the taxonomic differences between the late Toarcian gastropod faunas in the Cleveland Basin and those in France, and Northern and Southern Germany.</p>
The last representatives of the Superfamily Wellerelloidea (Brachiopoda, Rhynchonellida) in the westernmost Tethys (Iberian paleomargins) prior to their demise in the Early Toarcian Mass Extinction Event
<p><span>The last clade-level extinction episode affecting the Phylum Brachiopoda has been long-established in the Early Toarcian Mass Extinction Event (ETMEE) around the Pliensbachian-Toarcian transition, when several rhynchonellide groups became extinct and others underwent a notable renewal in the western Tethys. Among them, Wellerelloidea is a long-range superfamily severely affected by this environmental crisis, embodying the subfamily Cirpinae as the last wellerelloids worldwide, prior to their global extinction in the Pb-To transition. The profuse record of Lower Jurassic cirpines in the peri-Iberian paleomargins provides an opportunity to clarify the taxonomy of wellerelloid species in the pre-extinction interval. A new species (<em>Cirpa lucentina</em>) is erected and the revision of the Cirpinae taxa around the ETMEE is carried out. Morphometric analysis and the study of internal structures of the shells support the splitting between the genera <em>Cirpa</em> and <em>Salgirella</em>, adding new supplementary diagnostic criteria. The biogeographic distribution of this clade in the western Tethys and its evolutionary history in the Early Jurassic reveal </span><span>a <em>pervasive</em> colonization pattern of both epicontinental and epioceanic habitats. T</span><span>he Mediterranean origin of the last representatives of this group is ascertained, but while diversification of <em>Salgirella</em> took place in epioceanic habitats, speciation of <em>Cirpa</em> is unrelated to biochorema boundaries, even colonizing epicontinental seas until their extinction prior to the hyperwarming event that occurred in the basal Serpentinum Zone. A rhynchonellide morphogroup epitomized by cirpines was resilient to this event in the epicontinental seas. This morphogroup is also recorded after the extinction interval by means of the genus <em>Pseudogibbirhynchia</em>, thus postulating potential pre- and post-extinction phyletic relationships.</span></p>
Fig. 2 in Low durophagous predation on Toarcian (Early Jurassic) ammonoids in the northwestern Panthalassa shelf basin
Fig. 2. Geological map of the Toyora area, southwest Japan (modified from Tanabe et al. 1982).
Data from: Evaluating growth in Macrospondylus bollensis (Crocodylomorpha: Teleosauroidea) in the Toarcian Posidonia Shale, Germany
<p>The dataset includes raw data (S1 - S3), .txt files (S3) and R codes (S3). Raw data is comprised of bone element measurements. S3 is a compressed .zip folder which includes all data (code, raw and additional) that pertains to our (1) ANCOVA and (2) evolutionary allometry analyses. We have decided to keep all these files together in one folder for better access and to not mix them with our ontogenetic data. </p>
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