Geologists have been able to determine that the Bright Angel Shale layer formed near the shore of an ocean. What evidence could geologists use today to find out about this ancient rock layer?
Geologic History Unit Assessment, Part 2
Fossils found in the Bright Angel Shale rock layer could tell about the environment in which it formed.

A.
The presence of sandstone in the layer below indicates that the Bright Angel Shale was near the ocean.

B.
Scientists could examine the layers the Bright Angel Shale to look for radioisotopes of ocean minerals.

Question

Geologists have been able to determine that the Bright Angel Shale layer formed near the shore of an ocean. What evidence could geologists use today to find out about this ancient rock layer?
  Geologic History Unit Assessment, Part 2   
Fossils found in the Bright Angel Shale rock layer could tell about the environment in which it formed.
 
 A.
The presence of sandstone in the layer below indicates that the Bright Angel Shale was near the ocean.
 
 B.
Scientists could examine the layers the Bright Angel Shale to look for radioisotopes of ocean minerals.

anonymous · Answer

C.Scientists could examine the layers the Bright Angel Shale to look for radioisotopes of ocean minerals.

D. Scientists could examine the rocks above and below to look for geological evidence of wave action, which would indicate that the environment was near an ocean.
 
 answer is A