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Lecture 14

01:460:206 Lecture Notes - Lecture 14: Plate Tectonics, Mesozoic, Tanystropheus

Geological Sciences
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Ch 15 Structure and Evolution of the Dinosaur Ecosystem
Dinosaur ecosystem
o Time
When in the past is this happening
o Dinosaurs
What dinos (and other animals) where alive during those times
o Environment
What was the environment like
Time Periods
o Middle & Late Cretaceous
o Early Cretaceous
o Late Jurassic
o Early & Middle Jurassic
o Late Triassic
Mesozoic Extinctions
o Permian-Triassic Mass Extinction
95% of all life extinct
Reptiles become dominant
Massive eruption of lavas from Siberia and CO2 emissions
Ocean anoxia
Possible impact
Archosaurs and plants survive, land barren after extinction
o End-Triassic Mass Extinction
Dinosaurs come dominant life dorm
o End-Cretaceous Mass Extinction
~65% of all life went extinct
Mammals become dominant life form
Life in the Triassic Period (250-199 Ma)
o Dinos first appearing during this time
o Mammals, turtles, frogs, crocodiles all appeared in early forms
o Pterosaurs and Marine reptiles appeared
o Birth of the Atlantic Ocean
o Started off with the P-T Extinction
Plate Tectonics
o Pangea was formed with all continents together
o Climate was very hot and dry
o May explain why reptiles became dominant
o Life very similar everywhere on Earth because land was attached
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