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Lecture 16

Lecture 16 - Earth's Earliest Life

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Department
Earth Sciences
Course
Earth Sciences 1083F/G
Professor
Cameron Tsujita
Semester
Fall

Description
Lecture 16Earths Earliest Life y Single celled prokaryote microfossils found in Swaziland South Africa date to 35 billion years ago Archean Eon y Stomatolite constructed by cyanobacteria found in North Pole Western Australia dated to 35 billion years ago Archean Eon y Filamentous Prokaryote Microfossils most likely cyanobacteria found in Apex Chert Marble Bar Western Australia date to 346 billion years ago Archean Eon y Banded iron formations from 2520 billion years Proterozoic some from 2017 billion years ago o Time of widespread banded iron formation deposition o Enough oxygen to produce iron oxides in the ocean but no on land o Appearance of redbeds by 2 billion years ago o Indicates enough free oxygen in the atmosphere to oxidize iron in river water before it reaches the ocean y Stomatolites in Gunflint Chert Ontario o 19 billion years o Proterozoic y Hypersaline Intertidal Conditions Shark Bay Western Australia o Growth
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