Middle Jurassic

Huashanosaurus is a basal sauropod dinosaur that lived from the Early to Middle Jurassic periods of what is now China. It was a long-necked herbivore which still exhibited many basal traits of the earlier sauropodomorphs, while transitioning to obligate quardupedality. Huashanosaurus grew to approximately 12 m in length, and weighed around 10 t.

Restoration of Analong chuanjieensis, a sauropod dinosaur from the Middle Jurassic of China

A life reconstruction of the middle Jurassic sauropod, Spinophorosaurus nigerensis, from the nigerian Irhazer Shale.

Osgodby Formation (Middle Jurassic) exposed on the shore of Cayton Bay, North Yorkshire.

A lampshell of the genus Acanthothiris, Class Rhynchonellata, Order Rhynchonellida, Family Acanthothirididae, 20mm along the axis, view of the pedunculate valve, from Woodeaton, Oxfordshire, UK, middle Middle Jurassic (Bathonian)

A lampshell of the genus Acanthothiris, Class Rhynchonellata, Order Rhynchonellida, Family Acanthothirididae, 20mm along the axis, view of the opening, from Woodeaton, Oxfordshire, UK, middle Middle Jurassic (Bathonian)

A lampshell of the genus Acanthothiris, Class Rhynchonellata, Order Rhynchonellida, Family Acanthothirididae, 20mm along the axis, lateral view, from Woodeaton, Oxfordshire, UK, middle Middle Jurassic (Bathonian)

A lampshell of the genus Acanthothiris, Class Rhynchonellata, Order Rhynchonellida, Family Acanthothirididae, 20mm along the axis, view of the hinge, from Woodeaton, Oxfordshire, UK, middle Middle Jurassic (Bathonian)

A lampshell of the genus Acanthothiris, Class Rhynchonellata, Order Rhynchonellida, Family Acanthothirididae, 20mm along the axis, view of the brachial valve, from Woodeaton, Oxfordshire, UK, middle Middle Jurassic (Bathonian)

Reconstructed skull of Duriavenator hesperis showing known material (white) of the holotype and only known specimen. Unknown bones based on related Eustreptospondylus oxoniensis. Scale bar is 10cm, image is 10px/cm. Cranial anatomy based on Benson (2008) "A redescription of "Megalosaurus" hesperis (Dinosauria, Theropoda) from the Inferior Oolite (Bajocian, Middle Jurassic) of Dorset, United Kingdom"

Reconstructed skull of Wiehenvenator albati based on holotype specimen (white). Scale bar is 10cm, image if 10px/cm. Unknown material based on related Torvosaurus tanneri. Cranial anatomy based on Rauhut et al (2016) "A new megalosaurid theropod dinosaur from the late Middle Jurassic (Callovian) of north-western Germany: implications for theropod evolution and faunal turnover in the Jurassic"

Fossil of Streptospondylus, a dinosaur from the Middle Jurassic period of France. Took the photo at the Gallery of Paleontology and Comparative Anatomy in the French National Museum of Natural History, Paris.

A reconstruction of Aorun, a small coelurosaurian theropod from the Middle Jurassic China.

Aalenian GSSP (Lower-Middle Jurassic boundary). Golden spike ceremony: July, 28th 2016. Fuentelsaz, Guadalajara, Spain

Partial skull of Manidens condorensis from the Middle Jurassic Cañadón Asfalto Formation of Argentina. Skull reconstructions in lateral view. Dashed lines indicate estimated edges. Abbreviations: a angular antfo antorbital fossa asaf anterior surangular foramen be buccal emargination bo basioccipital bt basal tubera d dentary d1, 2, 11 dentary tooth 1, 2, 11 emfo external mandibular fossa f frontal gl glenoid gr groove j jugal jfl jugal flange jh jugal horn m maxilla m1, 11 maxillary tooth 1, 11 n nasal pd predentary pm premaxilla po postorbital pof postorbital fossa popr paroccipital process q quadrate qj quadratojugal ri ridge sa surangular sq squamosal.

Ophthalmosaurus icenius, from the time of the Callovian period of the Middle Jurassic. This specimen was found in Oxford Clay, in Peterborough, England. Photo lightly touched up to remove lighting flares.