For the following mark whether it is an example of absoulte time (A) or relative
ID: 156084 • Letter: F
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) the Calaveras fault displaces the San Pablo Group in the eastern San Francisco Bay Area, indicating that moment on the fault is younger than the Contra Costa Group.
(b) U-Pb ages of eclogite in the Sanbagwa belt of Japan are 120 million years old which makes them younger than the eclogites of the Franciscan Complex of California that give Lu-Hf ages of 155-170 million years.
(c) Yosemite Valley is incised (ie the canyon was cut) into granite and metamorphic rocka. This shows that the development of the canyon is younger than those rocks.
Explanation / Answer
a. R
b. A
c. R