GEOL 1003 Chapter : Ch13 Early Paleozoic
Document Summary
Paleozoic era: (cid:149) ~ 300 ma (cid:149) six periods (cid:149) starts with animal explosion, ends with the largest me (cid:149) starts with one supercontinent breakup, ends with formation of another (cid:149) three me divide this era into three segments: During this era, most animal phyla of the modern world appeared. Cambrian (542~488 ma) (cid:149) global transgression (cid:149) rapid diversification of life in the ocean cambrian explosion . Ordovician (488~444 ma) (cid:149) period of sustained higher sea level (cid:149) ordovician radiation (cid:149) glaciation-related global mass extinction. Cambria explosion (cid:149) early cambrian groups evolved skeletons e. g. , tommotian fauna - constitute the oldest diverse skeletonized fauna on earth, small shelly animals small shelly fossil, only few millimeters in length. Most of them can not be assigned to a living phylum. Cambrian bio (cid:149) early cambrian large skeleton animal (cid:149) trilobites (cid:149) arthropods (cid:149) first appear in the early.
