GEOL 1003 Chapter : Ch 13
Document Summary
Outline: introduction early palezoic, the cambrian period. An explosion of life: episodic mass extinctions. Trilobites at cambrian"s end: earth system shift 13. 1. Skeletons evolve in many groups: the ordovician period. 50% marine genera @ ordovician"s end: earth system shift 13. 2. Late ord. glaciation causes extinction: cambrian paleogeography, ordovician paleogeography, regional events of paleozoic time. The cambrian and ordovician periods of the early paleozoic era. The two oldest periods of the paleozoic era: An amazing time because fossils from rocks of this age and younger are conspicuous. This is the time when most animal phyla appeared. A period when life in the ocean diversified so fast that it is referred to as the early. But it ended tragically with a glaciation that induced the global"s first major mass extinction. 6: the cambrian period explosion of life. The bulk of fossil evidence indicates that the cambrian explosion of. The cambrian is very rich in fossils that are plainly visible.
