BIOL 1F90 Study Guide - Midterm Guide: Cambrian Explosion, Geologic Time Scale, Silurian

• School: Brock University
• Department: Biological Sciences
• Course: BIOL 1F90
• Professor: Doug Bruce

Document Summary

Geological time scale (visual from textbook at the end of geological time scale) Phanerozoic eon, paleozoic era: cambrian period ( ~ 543 mya) Burgess shale fossil deposits 505mya, excellent preservation of fossils including soft bodies in the. Canadian rockies: ordivician period ( ~ 490 - 443 mya) Warm and wet climate, diverse group of marine invertebrates including trilobites and brachiopods. Over 60% of existing marine invertebrates became extinct due to formation of large glaciers mass. Large colonization by terrestrial plants and animals. Many fish, vertebrates, vascular plants, spiders and centipedes, Figure 1 ordovician period and coral reefs appeared: devonian period (417-354 mya) Major increase in number of invertebrate species. Near the end, prolonged series of extinctions that eliminated. Insects emerged many marine species: carboniferous period (354-290 mya) Huge ass trees: permian period (290-248mya) Reptiles become dominant to amphibians, mammal like reptiles appear.