Early+Mesozoic[1]

Early+Mesozoic[1] - Mesozoic Era 145 Million years 202...

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Unformatted text preview: Mesozoic Era 145 Million years 202 Million years 251 Million years Triassic and Jurassic Periods Early Mesozoic • Bounded by mass extinctions • Recovery from Permian mass extinction of: – Lacy bryozoans – Rugose corals (horn coral) – Trilobites Early Mesozoic Life • Mollusks are abundant – Ammonoids • 2 genera diversity to 100 – Stromatolites returned to shallow water – Bivalves abundant – Sea urchins Early Mesozoic Life • Reefs – Hexacorals – Dominant reef builder – Some resemble rugose corals Early Mesozoic Life • Belemnoids – Squid-like relatives of Ammonoids • Ammonoids were important guide fossils Early Mesozoic Life • Fish- More modern- Scales covered bodies- Skeletons of cartilage- Simple Jaws- Peg-like teeth Early Mesozoic Life • Marine reptiles – Placodonts • Blunt-toothed shell crushers • Broad armored bodies Early Mesozoic Life • Marine reptiles – Nothosaurs • Early Triassic • May be first marine reptiles Early Mesozoic Life • Plesiosaurs – Evolved from nothosaurs – Possible Loch Ness Monster??? Early Mesozoic Life • Ichthyosaurs – Fish lizards – Bore live young Early Mesozoic Life on Land • Tree-forming Gymnosperms Early Mesozoic Life on Land • Mesozoic forests looked very different from modern forests Early Mesozoic Life on Land...
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This note was uploaded on 12/03/2011 for the course EES 106 taught by Professor Staceyhundley during the Winter '11 term at Wright State.

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Early+Mesozoic[1] - Mesozoic Era 145 Million years 202...

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