Biology
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gsc..nasa....5a&link_type=abstract
In NASA, Washington The Global Sulfur Cycle p 5-8 (SEE N85-32710 21-51)
Biology
Geochronology, Geodynamics, Geomorphology, Paleobiology, Paleontology, Precambrian Period, Rock Mechanics, Fossils, Planetary Environments, Prokaryotes, Structural Properties (Geology), Sulfur
Scientific paper
The Precambrian time which refers to geological time prior to the first appearance of animals with mineralized hard parts was investigated. Best estimates for this event are around 570 million years ago. Because the rock record begins some 3,800 million years ago the Precambrian encompasses about 84% of geologic time. The fossil record for this immense span of time is dominated by prokaryotes and the sedimentary structures produced by them. The first fossil remains that are considered eukaryotic are found in 1,000 million year old rocks. The first animals may be as old as 700 million years. The fossil records of the first 84% of the Earth's history are collected and described.
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