kerogenous
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kerogenous — ke·rog·e·nous … English syllables
kerogenous — adjective see kerogen … Useful english dictionary
Precambrian time — Interval of geologic time from с 3. 8 billion years ago, the age of the oldest known rocks, to 544 million years ago, the beginning of the Cambrian Period. This interval represents more than 80% of the geologic record and thus provides important… … Universalium
