112-pp30 - UNIVERSITY OF SOUTH ALABAMA Last time we...

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1 GY 112: Earth History UNIVERSITY OF SOUTH ALABAMA Mesozoic Geology Last time we covered…. Chordates 2 (Reptiles - Mammals; web notes 29) A) Fish to Amphibians B) Amphibians to Reptiles C) Reptiles to Mammals Reptile Evolution Ave Evolution (Triassic/Jurassic) Archaeopteryx Mammal Evolution All Mammals share the following common characteristics: •Fur •Mammary glands •Mostly live birth Today’s Agenda Mesozoic Overview (web notes 30) A) Finish off mammals (Web notes 29) B) The end of the Paleozoic C) Mesozoic time frame and evolutionary developments D) Paleogeography and key tectonic events
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2 Mammal Evolution We distinguish 3 mammalian subclasses (these are not their official names, just common names): •Monotremes egg-laying mammals; first of the class to appear in the rock (Triassic) Mammal Evolution We distinguish 3 mammalian subclasses (these are not their official names, just common names): •Marsupials: live birth, but require further development time in a pouch (Mid Cretaceous) Mammal Evolution We distinguish 3 mammalian subclasses (these are not their official names, just common names): •Placental mammals: live birth; young “fully” developed at birth (Late Cretaceous) ht p:/ www.on-lineretrievers.com/images2/mom_puppies.JPEG Mammal Evolution Vertebrate Evolution Geological Time Boundaries…
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3 Geological Time Boundaries… Were defined primarily on the basis of paleontological changes. Periods: significant changes Eras: really significant changes (i.e., Mass extinctions) Phanerozoic (245 to 550 MA) Paleozoic (65 to 245 MA) Mesozoic (0 to 65 MA) Cenozoic Years Era Major Extinction Major Extinction Mass Extinctions Extinctions have always been a part of the rock record Mass Extinctions Extinctions have
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112-pp30 - UNIVERSITY OF SOUTH ALABAMA Last time we...

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