BIO 1130 Study Guide - Quiz Guide: Late Devonian Extinction, Phanerozoic, Silurian

• School: University of Ottawa
• Department: Biology
• Course: BIO 1130
• Professor: Jon Houseman

Document Summary

Paleozoic era (550 2 45 ma ) Periods cambrian, ordovician, silurian, devonian, carboniferous, permian. Introduction (cid:862)age of fishes(cid:863) and (cid:862)age of plants(cid:863) Third geological time period in the paleozoic era. The base of the silurian is set after a mass extinction (end ordovician. Mass extinction) 60% of marine life wiped out. Marks the appearance of jawed and bony fish (vertebrate descendants of the chordate ancestor) Life makes its way onto land as small moss-like photosynthetic plants (near oceans edge) Fourth geological time period in the paleozoic era. Plants have diversified largely, since no large herbivores. Ancestors of tetrapods began adapting to walk on land. Most strange creatures from previous period have gone extinct. Those that survived: cnidaria corals, molluscs (shelled cephalopods, bivalves, gastropods, worms, echinoderms, bryozoa (not as many though, arthropods (few trilobites, crustacean; marine forms become larger) Beginning of the vertebrates (these are part of the phylum chordata) Large plates of dermal bone plates provide protection.