GSC 102 Study Guide - Quiz Guide: Geologic Time Scale, Trace Fossil, Permineralization

• School: University of Miami
• Department: Geological Sciences
• Course: GSC 102
• Professor: ta-shanataylor

Document Summary

Geologic time scale: correct order of the hadean and archaean eons. Hadean eon 4. 5/4. 6 bya is an unofficial eon, starts with the creation of earth and the solar system, & oceans formation of moon 4. 47 bya. Earth was molten, ocean, lot"s of co2, early bombardment. Any evidence is any preserved remains, impression, or trace of any once-living thing from a past geological age: methods of fossilization, petrifaction, the three methods of petrifaction (permineralization, replacement, carbonization, a. permineralizartion (cid:498)spread minerals throughout(cid:499). The originals composition remains, but is made harder by the minerals: b. The remaining organism-shaped hole in the rock is called an external mold. If this hole is later filled with other minerals, it is a cast. An endocast or internal mold is formed when sediments or minerals fill the internal cavity of an organism, such as the inside of a bivalve or snail or the hollow of a skull: soft tissue preservation.