GLGY 307 Lecture Notes - Lecture 12: Purple Bacteria, Pilbara Craton, Petrifaction
26 Dec 2017
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Document Summary
The zircon minerals from australia, which gave radiometric ages of circa 4. 4 billion years, require significant amounts of water: a catastrophic meteorite bombardment is documented in the early history of the celestial bodies from the inner solar system. Isua formation: thin layers of graphite occur in these rocks; as the graphite is the final product of the organic matter transformation in the subsurface conditions during the burial. 1 process, the thin layers were interpreted as representing either the fossilized" vestiges of the primordial soup. Oldest bacteria & cyanobacteria: the oldest fossils on earth were discovered in the apex chert; this lithological unit is part of a volcano-sedimentary unit of the pilbara cration of western. Australia: the apex rocks consist of conglomerates that were transformed into chart through the process of silicification. Isolated cells: early archean of western australia (pilbara craton, apex chert is a lithological unit in the volcano-sedimentary formation, earliest cyanobacteria debris.
