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Lecture 15

01:460:206 Lecture Notes - Lecture 15: Carnosauria, Stegosauria, Coelophysoidea

Geological Sciences
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Breakup of Pangea
o End of Triassic rifting began
o ~210 Ma
o Formation of Proto-Atlantic
A New Extinction
o End-Triassic Mass Extinction
o Dinosaurs became dominant life form
o Most marine reptiles except ichthyosaurs and pleisosaurs
o Protomammals, many archosaurs (except crocodilians, pterosaurs, and
o Volcanism (Central Atlantic Magmatic Province), impact, methane hydrate
Life in the Jurassic Period (~199-145 Ma)
o Marine reptiles, pterosaurs, mammals, and dinos continued to flourish
o Golden Age of the Dinosaur World”
o Other large carnivores and herbivores were gone
Early & Middle Jurassic
o Age of Cycads
o Vegetation
o Small to medium sized sauropods
o Small stegosaurids
o Group Tetanurae fused tail lizard
o Three fingers on hand
o Digits 1-2-3
o Digits 4-5 lost on forelimb (large hands and fused tails)
o First beaked dinos (Hypsilophodontidae)
o Primitive Thyreophorans
o Large plesiosaurs
Geography and climate
o Animals similar throughout world (still supercontinent)
o Dinos began to change by Mid-Jurassic
Changing Life in Mid to Late Jurassic
o Coelophysoids, prosauropods, primitive ornithischians died out
o Replaced by more specialized dinosaurs
o Tetanurines (spinosaurs, carnosaurs, large predators; coelurosaurs
small predators)
o Armored stegosaurs and Ankylosaurs
o More advanced Ornithopods
o Most abundant late Jurassic dinos = carnosaurs, stegosaurs, sauropods
Late marine life
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