Geology Eon Notes
Geology Eon Notes GEO 101
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This 2 page Class Notes was uploaded by Carter Cox on Monday April 11, 2016. The Class Notes belongs to GEO 101 at University of Alabama - Tuscaloosa taught by Keene in Spring2015. Since its upload, it has received 11 views. For similar materials see Dynamic Earth in Geology at University of Alabama - Tuscaloosa.
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Date Created: 04/11/16
Geo Eons and Era’s Notes Eons Hadean Eon - 4.55 Ga o Formation of Earth - 4.5 Ga o Internal Differentiation Gravity pulled down molten iron to the center of the Earth o Dense materials sink - 4.5 Ga o Formation of the moon occurs - Before 4.4 Ga o Molten rock surface o Non oxygen atmosphere o No water - After 4.4 Ga o Australian Zircon o Maybe solid rock o Non oxygen atmosphere o Some water - 4 Ga o Meteor hits, destroys existing surface o Surface is reformed to small volcanic islands - END OF HADEAN EON o No life o Very little land o There is an acidic ocean that is not made out of water Archean Eon - Paleogeography o 80% of continental area - Seas and Atmosphere o Liquid water to create seas o Not enough oxygen in atmosphere - First Life o Earliest Fossil 3.5 Ga, single cell Carbon isotopes Stromatolbites Algae mats Photosynthesis Creates oxygen at 2.95 Ga Proterozoic Eon - Paleogeography o 90% of continental crust that we have today o This is growing throughout the entire eon - Supercontinents o Large land masses- nearly all continents combined o Constant splitting and reassembling happens o This has a profound affect on climate - Rodinia o First super continent - Pannotia o Reverse of Rodinia - Atmosphere o Amount of oxygen increase a lot (algae is causing this) o How do we know BIF- Bandit Iron Formation Cannot form unless certain amount of oxygen is in the air Thus changing the chemistry of the ocean - Life o Eukaryotic evidence at 2.7 Ga o First fossils from 2.1 Ga o Symbiotic Relationship - Plants o Ocean Algae o Land Algae Fungi Fossil- 650 to 544 Ma Molecular Clock- 1.3 Ga - Ediacaran Fauna – soft bodied o Fossil o 565 Ma o Worms/ jellyfish o No shells o Underwater soft bodied fossils - Snowball Earth o Glaciers everywhere even on land o Possible frozen ocean o Mass extinction ends eon
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