GEOL 1003 Chapter : Chapter 13 Early Paleozoic World 1
Document Summary
Important concepts: what"s happening in the oceans, defining the geologic time periods (cambrian, ordovician, biota (dominant, evolving, me, geology (continental configuration, orogenic events, chemical reservoirs (ocean chemistry, isotopic change) Introduction: early paleozoic, cambrian + ordovician, conspicuous fossils, most animal phyla appeared, cambrian, global transgression (rising sea level, rapid diversification of life in the ocean. Early cambrian explosion : ordovician, period of sustained higher sea level, ordovician radiation, glaciation-related global mass extinctions (first ever?, early cambrian, neoproterozoic biota was primarily soft-bodied, base of early cambrian. Index fossil: trepitchnus pedum: complex burrower (branching, the first occurrence is roughly coincident with the last appearance of. Ediacaran fauna: many early cambrian groups evolved skeletons, divided accordingly into three intervals, earliest skeletonized cambrian fossils, 1. ) Lowermost cambrian: simple tube-shaped or vase-shaped skeletons, some with small teeth, 2. ) Tommotian fauna (lower cambrian: small skeletal elements, gastropod-mollusk + sponge spicule, some not assigned to a living phylum, occupied seas ~3. 4 million years, sudden disappearance, 3. )
