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17 results for “Oxford Clay Formation”
Fig. 12 in A new pliosaurid from the Oxford Clay Formation of Oxfordshire, UK
Fig. 12. Holotype of the pliosaurid plesiosaur Eardasaurus powelli gen. et sp. nov. (OUMNH PAL-J.2247) from the Middle Jurassic of Yarnton, Oxfordshire, UK. A, B. Scleral ossicles. C. Hyoid element, orientation unknown.
Fig. 11 in A new pliosaurid from the Oxford Clay Formation of Oxfordshire, UK
Fig. 11. Holotype of the pliosaurid plesiosaur Eardasaurus powelli gen. et sp. nov. (OUMNH PAL-J.2247) from the Middle Jurassic of Yarnton, Oxfordshire, UK. Detail of posterior end of mandibular symphysis. Photograph (A1), interpretive drawing (A2), light grey, broken bone; dark grey, matrix.
Fig. 9 in A new pliosaurid from the Oxford Clay Formation of Oxfordshire, UK
Fig. 9. Holotype of the pliosaurid plesiosaur Eardasaurus powelli gen. et sp. nov. (OUMNH PAL-J.2247) from the Middle Jurassic of Yarnton, Oxfordshire, UK. Mandible in right lateral (A1, A2) and medial (A3, A4) views. Photographs (A1, A3), interpretive drawings (A2, A4), light grey, broken bone; mid grey, filler; dark grey, matrix.
Fig. 7 in A new pliosaurid from the Oxford Clay Formation of Oxfordshire, UK
Fig. 7. Holotype of the pliosaurid plesiosaur Eardasaurus powelli gen. et sp. nov. (OUMNH PAL-J.2247) from the Middle Jurassic of Yarnton, Oxfordshire, UK. Mandible in dorsal view. Photograph (A1), interpretive drawing (A2), light grey, broken bone; mid grey, filler; dark grey, matrix.
Fig. 6 in A new pliosaurid from the Oxford Clay Formation of Oxfordshire, UK
Fig. 6. Holotype of the pliosaurid plesiosaur Eardasaurus powelli gen. et sp. nov. (OUMNH PAL-J.2247) from the Middle Jurassic of Yarnton, Oxfordshire, UK. Detail of right ventral orbital margin in lateral view. Photograph (A1), interpretive drawing (A2), light grey, broken bone.
Fig. 14 in A new pliosaurid from the Oxford Clay Formation of Oxfordshire, UK
Fig. 14. Phylogenetic topology for Pliosauridae, focussing on Early–Middle Jurassic representatives, based on Bayesian Mkv analysis. Numbers indicate posterior support for nodes demonstrating strong support for many aspects, but weaker support for relationships among Peloneustes philarchus, Anguanax zignoi, and Eardasaurus powelli gen. et sp. nov., which are tentatively recovered as grade leading to more derived pliosaurids.
Fig. 5 in A new pliosaurid from the Oxford Clay Formation of Oxfordshire, UK
Fig. 5. Holotype of the pliosaurid plesiosaur Eardasaurus powelli gen. et sp. nov. (OUMNH PAL-J.2247) from the Middle Jurassic of Yarnton, Oxfordshire, UK. Cranium in ventral view. Photograph (A1), interpretive drawing (A2), light grey, broken bone; mid grey, filler; dark grey, matrix.
Fig. 3 in A new pliosaurid from the Oxford Clay Formation of Oxfordshire, UK
Fig. 3. Holotype of the pliosaurid pleasiosaur Eardasaurus powelli gen. et sp. nov. (OUMNH PAL-J.2247) from the Middle Jurassic of Yarnton, Oxfordshire, UK. Cranium in right lateral view. Photograph (A1), interpretive drawing (A2), light grey, broken bone; mid grey, filler; dark grey, matrix; detail showing region around external naris including frontal–maxilla suture (A3).
Fig. 8 in A new pliosaurid from the Oxford Clay Formation of Oxfordshire, UK
Fig. 8. Holotype of the pliosaurid plesiosaur Eardasaurus powelli gen. et sp. nov. (OUMNH PAL-J.2247) from the Middle Jurassic of Yarnton, Oxfordshire, UK. Mandibular symphysis in dorsal (A1, A2), left lateral (A3, A4), and ventral (A5, A6) views. Photographs (A1, A3, A5), interpretive drawings (A2, A4, A6), light grey, broken bone; mid grey, filler; dark grey, matrix.
Fig. 2 in A new pliosaurid from the Oxford Clay Formation of Oxfordshire, UK
Fig. 2. Holotype of the pliosaurid pleasiosaur Eardasaurus powelli gen. et sp. nov. (OUMNH PAL-J.2247) from the Middle Jurassic of Yarnton, Oxfordshire, UK. Cranium in dorsal view. Photograph (A1), interpretive drawing (A2), light grey, broken bone; mid grey, filler; dark grey, matrix.
Fig. 1 in A new pliosaurid from the Oxford Clay Formation of Oxfordshire, UK
Fig. 1. Holotype of the pliosaurid plesiosaur Eardasaurus powelli gen. et sp. nov. (OUMNH PAL-J.2247) from the Middle Jurassic of Yarnton, Oxfordshire, UK. Photograph of the specimen on display in OUMNH. Skeleton laid out as discovered, with the exception of the left hindlimb (highlighted in black), which was originally disarticulated. An artist's reconstruction of E. powelli is partially visible in the top right-hand side of the image.
Fig. 13 in A new pliosaurid from the Oxford Clay Formation of Oxfordshire, UK
Fig. 13. Holotype of the pliosaurid plesiosaur Eardasaurus powelli gen. et sp. nov. (OUMNH PAL-J.2247) from the Middle Jurassic of Yarnton, Oxfordshire, UK. A. Mesial tooth in anterior or posterior (A1), lingual (A2), anterior or posterior (A3), and labial (A4) views; close-up of crown of tooth showing detail of "carinae" in anterior or posterior (A5–A6), labial (A7), and tip (A8) views. B. Distal ("ratchet" type) tooth in anterior or posterior (B1), lingual (B2), anterior or posterior (B3), labial (B4), and tip (B5) views.
Fig. 10 in A new pliosaurid from the Oxford Clay Formation of Oxfordshire, UK
Fig. 10. Holotype of the pliosaurid plesiosaur Eardasaurus powelli gen. et sp. nov. (OUMNH PAL-J.2247) from the Middle Jurassic of Yarnton, Oxfordshire, UK. Detail of right coronoid eminence in lateral view. Photograph (A1), interpretive drawing (A2), light grey, broken bone; dark grey, matrix.
text-fig. 5. Skull reconstructions of representatives of Jurassic OTUs in left lateral view, a, Dilophosaurus wetherilli, Early Jurassic (Sinemurian-Pliensbachian), Kayenta Formation, Arizona, USA; based on UCMP V 4214 and V 6468. B, Syntarsus rhodesiensis, Early Jurassic (Hettangian-Sinemurian), Forest Sandstone, Zimbabwe; composite reconstruction based on many isolated skull elements from the National Museum of Natural History in Harare (see Appendix), c, Magnosaurus oxoniensis, Middle Jurassic (Callovian), Oxford Clay, England; based on OUM J 13558, unpreserved elements shaded. D, Monolophosaurus jiangi, Middle Jurassic, Wucaiwan Formation, China; redrawn from Zhao and Currie (1993b). E, Allosaurus fragilis, Late Jurassic (Kimmeridgian-Tithonian), Morrison Formation, USA; based on MOR 693. f, basal bird Archaeopteryx sp., Late Jurassic (Tithonian), lithographic limestones of Solnhofen, Germany; based on Wellnhofer (1974), Elzanowski and Wellnhofer (1996), and the Berlin, Eichstätt, and Munich specimens. G, Ceratosaurus sp., Late Jurassic (Kimmeridgian-Tithonian), Morrison Formation, USA; based on USNM 4735 and UMNH VP 5278. H, Ornitholestes hermanni, Late Jurassic (Kimmeridgian-Tithonian), Morrison Formation, USA, based on AMNH 619. Abbreviations as in Text-figure 4, and: If, lacrimal fenestra; mf, maxillary fenestra; nf, nasal foramen; pmf, promaxillary fenestra. Scale bars represent 10 mm (b, f, h), 50 mm (c) and 100 mm (a, d, e, g). in The interrelationships and evolution of basal theropod dinosaurs
text-fig. 5. Skull reconstructions of representatives of Jurassic OTUs in left lateral view, a, Dilophosaurus wetherilli, Early Jurassic (Sinemurian-Pliensbachian), Kayenta Formation, Arizona, USA; based on UCMP V 4214 and V 6468. B, Syntarsus rhodesiensis, Early Jurassic (Hettangian-Sinemurian), Forest Sandstone, Zimbabwe; composite reconstruction based on many isolated skull elements from the National Museum of Natural History in Harare (see Appendix), c, Magnosaurus oxoniensis, Middle Jurassic (Callovian), Oxford Clay, England; based on OUM J 13558, unpreserved elements shaded. D, Monolophosaurus jiangi, Middle Jurassic, Wucaiwan Formation, China; redrawn from Zhao and Currie (1993b). E, Allosaurus fragilis, Late Jurassic (Kimmeridgian-Tithonian), Morrison Formation, USA; based on MOR 693. f, basal bird Archaeopteryx sp., Late Jurassic (Tithonian), lithographic limestones of Solnhofen, Germany; based on Wellnhofer (1974), Elzanowski and Wellnhofer (1996), and the Berlin, Eichstätt, and Munich specimens. G, Ceratosaurus sp., Late Jurassic (Kimmeridgian-Tithonian), Morrison Formation, USA; based on USNM 4735 and UMNH VP 5278. H, Ornitholestes hermanni, Late Jurassic (Kimmeridgian-Tithonian), Morrison Formation, USA, based on AMNH 619. Abbreviations as in Text-figure 4, and: If, lacrimal fenestra; mf, maxillary fenestra; nf, nasal foramen; pmf, promaxillary fenestra. Scale bars represent 10 mm (b, f, h), 50 mm (c) and 100 mm (a, d, e, g).
Data from: A new pliosaurid (Sauropterygia, Plesiosauria) from the Oxford Clay Formation (Middle Jurassic, Callovian) of England: evidence for a gracile, longirostrine grade of Early–Middle Jurassic pliosaurids
A partial skeleton from the Sigiloceras enodatum ammonite Subzone (early Callovian, Middle Jurassic) of the Oxford Clay Formation of Quest Pit, near Stewartby, Bedfordshire, UK respresents one of the basalmost Middle Jurassic pliosaurids. Marmornectes candrewi gen. et sp. nov. possesses seven autapomorphies and a longirostrine snout. Reassessment of pliosauroid relationships demonstrates that Thalassiodracon hawkinsii, Hauffiosaurus spp. and Attenborosaurus conybeari are successively more derived basal representatives of Pliosauridae. This indicates that a longirostrine snout was acquired among Early Jurassic pliosaurids (such as Hauffiosaurus), but that these early taxa had a small body size, long neck, and gracile skull and limb bones relative to the contemporaneous rhomaleosaurids, which were robust, large-bodied macropredators. The pliosaurid lineage only acquired its 'characteristic' large size, robust skull and short neck in the late Middle Jurassic after the extinction of Rhomaleosauridae.
Data from: A new pliosaurid (Sauropterygia, Plesiosauria) from the Oxford Clay Formation (Middle Jurassic, Callovian) of England: evidence for a gracile, longirostrine grade of Early–Middle Jurassic pliosaurids
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Fig. 4 in A new pliosaurid from the Oxford Clay Formation of Oxfordshire, UK
Fig. 4. Holotype of the pliosaurid plesiosaur Eardasaurus powelli gen. et sp. nov. (OUMNH PAL-J.2247) from the Middle Jurassic of Yarnton, Oxfordshire, UK. Rostrum in dorsal (A1, A2), left lateral (A3, A4), and ventral (A5, A6) views. Photographs (A1, A3, A5), interpretive drawings (A2, A4, A6), light grey, broken bone; mid grey, filler; dark grey, matrix.
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