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2013GLG101_Garnero_HW4

57 ga gagigayears ago ie billions of years ago ma is

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Unformatted text preview: younger than those containing fossil Z. B. strata containing fossil Y are always older than those containing fossil Z. C. strata containing fossil Y are always younger than those containing fossil Z. D. fossil Z might occur in unit G. (Note: Assume that the last occurrence of a species shown on the chart represents the extinction of the species.) 6. On what basis do geologists conclude that the Earth formed about 4.57 Ga? (“Ga”=”giga”years ago, i.e., billions of years ago. “Ma” is for megayears ago, or millions of years ago) A. Radiometric ages of the oldest rocks found on continents. B. Radiometric ages of certain types of meteorites. C. The age of clasts in the oldest known sedimentary rocks on Earth. D. Measurement of the spectra of the Sun. E. It was mentio...
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