Lecture Notes on The Standard Geologic Time Scale

Lecture Notes on The Standard Geologic Time Scale - Lecture...

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Lecture’Notes’ ’ The’Standard’Geologic’Time’Scale Standard’Geologic’Time’Scale ’ A’worldwide’relative’time’scale. Subdivides’geologic’time ’ Eras:’ o Precambrian:’denotes’the’vast’amount’of’time’that’preceded’the’ Paleozoic’Era ’ o Paleozoic’Era:’began’with’the’appeara nce’of’complex’life’as’indicated’ by’fossils. ’ o Mesozoic’Era:’followed’the’Paleozoic’period Numerical’Age ’ Counting’annual’growth’rings’in’a’tree’trunk’will’let’you’know’how’old’a’tree’ is.’ Layers’of’sediment’deposited’annually’in’glacial’lakes’can’be’counted’t o’ determine’how’long’those’lakes’existed. Isotopic’Dating ’ Radioactivity’provides’a’“clock”’that’begins’running’when’radioactive’ elements’are’sealed’into’newly’crystallized’minerals.’ Determining’the’age’if’a’rock’through’its’radioactive’elements’is’known’a s’ isotopic’dating.’ ’
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