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Accumulated evidence indicates that (1) the major part of chemical and organic evolution occurred during the 3-5 × 109 years of the earth's history preceding the Paleozoic; (2) the basic elements constituting petroleum existed in the early phases of the earth's history; (3) unmetamorphosed Precambrian lithic types are similar to younger ones; and (4) the population of the later Precambrian seas was relatively rich and varied, though hard skeletal parts are notably absent in these rocks and, in all probability, were not widely developed.
As petroleum is now generally considered of organic origin and is widely disseminated and integral part of most sedimentary rocks, should we not consider unmetamorphosed Precambrian strata to be prospective for petroleum?
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