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BIO211H5 (55)
Lecture

BIO211
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Department
Biology
Course
BIO211H5
Professor
Jessica Hawthorn
Semester
Fall

Description
“Hadean”- no life Archean Eon- rocks deposited in Archean Eonothem Proterozoic Eon- Rocks deposited in Proterozoic Eonothem Craton: large non-deformed portions of very old continents, usually of Precambrian age (much has been destroyed) Canadian Shield: Precambrian craton exposed at surface by glaciation “Precambrian” craton- continental crust formed Marine sediments form wedge between continental masses-become greenstone belts Abundant chlorite-produces green colour Chert interbedded with sediments rich in iron-produces red/brown colour Stromatolites: Structures built by cyanobacteria; 3.5 Ga ago– Present- suggest photosynthesis Included O2( likely not present in early Earth)
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