GEOL 1003 Chapter : GEOLOGY EXAM 4 Ch 15
Document Summary
15 the late paleozoic era: carboniferous and permian. Overview of permian period: glaciers receded, major tectonic events-mountain building at applachians and ouachitas, formation of pangea supercontinent, very dry climate, reduction of coal swamps. Later, terrestrial therapsids(mammal-like) became dominant land vertebrates: life in the late paleozoic seas, some species never recovered from devonian mass extinction, tabulate corals. Stromatoporoids: both"s roles became minor to marine-life, others re-diversified quickly and became prominent, ammonoids (swimmers, abundant & diverse so extremely useful to date late paleozoic sections. Light shells indicate high mobility: sharks & ray-fin bony fish out compete armored fish, they were diverse and abundant in late paleozoic, the top marine predator, armored placoderms (very common in devonion seas) became extinct in the. Carboniferous: most other armored forms ( fish with heavy & slow shells=nautiloids) disappeared as well-> replaced by mobile life forms. Segmented stalks that broke into disk segments that play huge role in.
