Early Jurassic

Laurasia during the closure of the Iapetus Ocean at 430 Ma. Made using GPlates: Citations: Golonka, J. (2007), Late Triassic and Early Jurassic palaeogeography of the world, Palaeogeography, Palaeoclimatology, Palaeoecology, 244(1-4), 297-307. Müller, R., M. Sdrolias, C. Gaina, and W. Roest (2008), Age, spreading rates, and spreading asymmetry of the world's ocean crust, Geochemistry, Geophysics, Geosystems, 9(Q04006), 19. Seton, M., R. Müller, S. Zahirovic, C. Gaina, T. Torsvik, G. Shephard, A. Talsma, M. Gurnis, M. Turner, and M. Chandler (2012), Global continental and ocean basin reconstructions since 200 Ma, Earth-Science Reviews, 113(3-4), 212-270. Torsvik, T., and R. Van de Voo (2002), Refining Gondwana and Pangea Palaeogeography: Estimates of Phanerozoic non dipole (octupole) fields, Geophysical Journal International, 151(3), 771-794. Wright, N., S. Zahirovic, R. D. Müller, and M. Seton (2013), Towards community-driven, open-access paleogeographic reconstructions: integrating open-access paleogeographic and paleobiology data with plate tectonics, Biogeosciences, 10, 1529-1541

Laurasia during the closure of the Iapetus Ocean at 430 Ma. Made using GPlates: Citations: Golonka, J. (2007), Late Triassic and Early Jurassic palaeogeography of the world, Palaeogeography, Palaeoclimatology, Palaeoecology, 244(1-4), 297-307. Müller, R., M. Sdrolias, C. Gaina, and W. Roest (2008), Age, spreading rates, and spreading asymmetry of the world's ocean crust, Geochemistry, Geophysics, Geosystems, 9(Q04006), 19. Seton, M., R. Müller, S. Zahirovic, C. Gaina, T. Torsvik, G. Shephard, A. Talsma, M. Gurnis, M. Turner, and M. Chandler (2012), Global continental and ocean basin reconstructions since 200 Ma, Earth-Science Reviews, 113(3-4), 212-270. Torsvik, T., and R. Van de Voo (2002), Refining Gondwana and Pangea Palaeogeography: Estimates of Phanerozoic non dipole (octupole) fields, Geophysical Journal International, 151(3), 771-794. Wright, N., S. Zahirovic, R. D. Müller, and M. Seton (2013), Towards community-driven, open-access paleogeographic reconstructions: integrating open-access paleogeographic and paleobiology data with plate tectonics, Biogeosciences, 10, 1529-1541

Sarcosaurus diagram of known material: reconstruction based on basal Ceratosaurs (such as Berberosaurus and Saltriovenator). The Skull was made to look more generic and less like more derived Ceratosaurs such as Ceratosaurus. "Liassaurus", referred to "cf. Sarcosaurus woodi" and is smaller than the holotype: material in light grey is preserved, but to what extent is uncertain as it is not figured. References: Carrano and Sampson (2004). "A review of coelophysoids (Dinosauria: Theropoda) from the Early Jurassic of Europe, with comments on the late history of the Coelophysoidea." N. Jb. Geol. Palaont. Mh., 2004(9): 537-558. (for figures of the material) theropoddatabase.com/Coelophysoidea.htm#Sarcosauruswoodi (for measurements of "Liassaurus") Allain, Ronan & Tykoski, Ronald & Aquesbi, Najat & Jalil, Nour-Eddine & Monbaron, Michel & Russell, Dale & Taquet, Philippe. (2007). An abelisauroid (Dinosauria: Theropoda) from the Early Jurassic of the High Atlas Mountains, Morocco, and the radiation of Ceratosaurs. Journal of Vertebrate Paleontology. 27. 10.1671/0272-4634(2007)27[610:AADTFT]2.0.CO;2. (for measurements for Berberosaurus)

Megapnosaurus is a coelophysid theropod dinosaur from the Early Jurassic Period of Africa. It was a lightly built bipedal carnivore that grew to just over 2 m long and 13 kg in body mass. Its close relation to Coelophysis has caused some confusion in classifying the genus - it had a slender build and curved S-shaped neck, but was more robust. Comparisons between the scleral rings of Megapnosaurus and modern birds and reptiles indicate that it may have been nocturnal.

Macroplata tenuiceps, a pliosaur from the Early Jurassic of Europe, pencil drawing

Life restoration of the small German Jurassic ichthyosaur Hauffiopteryx typicus. References Maxwell, E. E.; Cortés, D. (2020). "A revision of the Early Jurassic ichthyosaur Hauffiopteryx (Reptilia: Ichthyosauria), and description of a new species from Southwestern Germany". Palaeontologia Electronica 23: 1–43. Archived from the original on 2022-07-06. Retrieved on 2022-03-15. Note: This image is currently uncolored

reconstruction of the Early Jurassic sauropod Perijasaurus lapaz.

Pantydraco caducus, a sauropodomorph from the Late Triassic or Early Jurassic of England, after Yates, 2003, pencil drawing, digital coloring

Adeopapposaurus mognai, Early Jurassic of Argentina. Digital.

Fossil samples – e.g. ‘primitive’ bony fish (1, 2), a skull of a temnospondyl ‘amphibian’ (probably a metoposauroid) in dorsal view (3), a skull of an archosaur of the crocodile lineage (probably a phytosaur) in palatal view (4), holotype of the “gliding reptile” Icarosaurus siefkeri [1] (5) and Atreipus-Grallator-type dinosaur tracks (bottom right) – from the Newark Supergroup, i.e. a series of mainly Late Triassic to Early Jurassic sedimentary rocks of eastern North America ↑ Edwin H. Colbert: A gliding reptile from the Triassic of New Jersey. American Museum Novitates, 2230. American Museum of Natural History, New York 1966, digitallibrary.amnh.org, cf. fig. 3 therein.

Restoration of Pradhania gracilis from the Early Jurassic of India

Ichthyosaurus communis, Early Jurassic of England. Digital.

Early Jurassic (Lias γ, Pliensbachian) ferruginous limestone (the bed below the hammer) and marl (the bed ‘behind’ the hammer) in the cap rocks of the oolithic iron ore deposit at the village of Rottorf am Klei, Lower Saxony, Germany, largely obscured by weathered material of the same rocks.

Restoration of Early Jurassic environment preserved at the SGDS, with the theropod Dilophosaurus wetherilli in bird-like resting pose, demonstrating the manufacture of SGDS.18.T1 resting trace.

The type specimen of the ichnogenus Cheliceratichnus, from the Early Jurassic East Berlin Formation of Holyoke, Massachusetts.

Bifurculapes laqueatus trackway (positive hyporelief, i.e. casts on the bottom surface of the bed) from the Early Jurassic East Berlin Formation (Hartford Basin) of Holyoke, Massachusetts (not the same specimen as this one). See coin (1 U.S. cent, 19.05 mm in diameter) for scale.