GEOL 1020 Lecture Notes - Lecture 26: Micropaleontology, Archean, Proterozoic
27 Oct 2016
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Document Summary
We started off simple but work up to more complex life forms. Life in the archean and leading to the proterozoic. How can you fossilize micro-organisms: bacterial microfossil about 10th of a micrometer long, found in near the north pole. 3. 5 billion years ago: modern oscilatoria cyanbacterium. A reason there is a green covering in lakes. There is a similar shape to the bacterial microfossil. The right environment to fossilize: few very old rocks escaped terrestrial recycling from plate tectonics, metamorphism, weathering, etc, those rocks that are preserved provide our only direct window into life on the early earth. They are so ancient that they are the oldest living organisms that are present today: analyzing the organisms living in the rocks near the hot springs shows us that they have the oldest ancestry on earth. Most of gold, silver, iron, copper is formed or deposited in environments such as hot springs.
