GEOL 1003 Chapter : GEOLOGY EXAM 4 Ch 13 14
Document Summary
Chapter 13 early paleozoic: cambrian & ordovician periods. Small tube-shaped or vase-shaped skeletons; some contained small teeth: the tommatian fauna from the central part of lower-cambrian (middle that lasted 3- Soft-body arthropods (most diverse: predatory worms (priapulids, anomalocarids, huge carnivores (2m long) that resemble arthropods. Sponges from the framework for low encrusted reef mounds: archaeocyanthids were suspension feeders that pump water though porous wall probably sponges. Found in rocky mountains in canada: the species recovered included: Cambrian: the burgess shale was derived from material on the platform"s outer edge. Ordovician: the few genera that survived became abundant when the competition died off-- These species evolved and began a gradual radiation: earth system shift 13. 1 (skeletons evolve in many animal groups, origin of skeletons in marine fauna. Swimmers with straight chambered shell: good predators with tentacles, pursue prey using jet propulsion, graptolites. Floating zooplankton: the radiation of marine life in mid/late ordovician, a 3-fold increase in the number of marine families.
