EARTH 7 Lecture Notes - Lecture 12: Herrerasaurus, Coelurosauria, Endemism
- For most part mesozoic was hot, except for one cold snap
- Triassic was hot and dry, due to the position of pangea…
- Few barriers to dispersal in the triassic
- Herrerasaurus
- One of the earliest known dinosaurs
- Small, bipedal, fast
- Dinosaur in center of pic is prosauropod
- Triassic: 2 major groups - herrerasaurus, prosauropod (long neck, bipedal)
- Late triassic: mammals, pterosaurs
- The jurassic (~200-145 Ma)
- Jurassic = warm and humid
- Pangea began split into two throughout jurassic
- Most well known sauropods were dominant in the jurassic
- Sauropodomorphs are most abundant when plants….
- Coelurosaurs
- Manoraptors
- Ornithomimids
- Trex
- Jurassic, including mostly non coelurosaurian theropods (coelurosaurians =
cretaceous)
- Pterosaurs diversify in jurassic, become dominant in sky
- The cretaceous (145 - 65 Ma)
- Cretaceous still relatively warm, shallow continents
- Shallow continental seawats are due to high sea level
- No glaciers
- Lots of mid ocean ridges as oangaea contunu
- Breakup ofcontine ns treatekniddocau n v
- Separation of land masses (due to breakuo and continental seas) → geographic
isolation
- Isolated organisms cannot interbreed → evolve independently
- Endemism - distinct faunas not known from anywhere else in the world (one
place in the world)
- The endemic fauna of australia
- Cretaceous island dwarfism pygmy euro dino
- Cretaceous, flowering plants appear and diversify
- Pterosaurs survive until the end of the cretaceous, but they become less
dominant as avialaens diversify
Major things:
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Document Summary
For most part mesozoic was hot, except for one cold snap. Triassic was hot and dry, due to the position of pangea . Few barriers to dispersal in the triassic. Dinosaur in center of pic is prosauropod. Triassic: 2 major groups - herrerasaurus, prosauropod (long neck, bipedal) Pangea began split into two throughout jurassic. Most well known sauropods were dominant in the jurassic. Jurassic, including mostly non coelurosaurian theropods (coelurosaurians = cretaceous) Pterosaurs diversify in jurassic, become dominant in sky. Shallow continental seawats are due to high sea level. Lots of mid ocean ridges as oangaea contunu. Separation of land masses (due to breakuo and continental seas) geographic isolation. Endemism - distinct faunas not known from anywhere else in the world (one place in the world) Pterosaurs survive until the end of the cretaceous, but they become less dominant as avialaens diversify. The k-pg mass extinction (and a few highlights since then)
