For the following mark whether it is an example of absoulte time (A) or relative

Question

For the following mark whether it is an example of absoulte time (A) or relative time (R) (ie write A or R at the end of each)

(a) Ar-Ar ages of amphibolites in the Yuba River area of the Feather River ultramafic belt show that these rocks were metamorphosed 340 million years ago

(b) the U-Pb ages of the youngest granites in the Sierra Nevada is 85 million years old

(c) The Wilson Grove Formation overlies the Tolay Volcanics in Sonoma County, indicating that the Wilson Grove Formation is younger than the Tolay Volcanics.

Explanation / Answer

a. R

b. A

C. A

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