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Author Question: If a fossil is encased in a stratum of sedimentary rock without any strata of ig (Read 717 times)

penguins

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on: Jul 12, 2013
If a fossil is encased in a stratum of sedimentary rock without any strata of igneous rock (for example, lava, volcanic ash) nearby, then it should be
A) easy to determine the absolute age of the fossil, because the radioisotopes in the sediments will not have been "reset" by the heat of the igneous rocks.
B) easy to determine the absolute age of the fossil, because the igneous rocks will not have physically obstructed the deposition of sediment of a single age next to the fossil.
C) easy to determine, as long as there is enough metamorphic rock nearby.
D) difficult to determine the absolute age of the fossil, because the "marker fossils" common to igneous rock will be absent.
E) difficult to determine the absolute age of the fossil, because radiometric dating of sedimentary rock is less accurate than that of igneous rock.


Millan

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Reply #1 on: Jul 13, 2013
I know it's E, we did this last month ;)


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penguins

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Reply #2 on: Jul 18, 2013
Thank you, thank you!!


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