What can you infer from this contact between an overlying conglomerate and underlying sandstone?
A)The conglomerate was deposited by the wind.
B)There was a gradual switch from marine to nonmarine conditions.
C)There was a gradual switch from nonmarine to marine conditions.
D)There was an abrupt event,such as a flood.

Question

What can you infer from this contact between an overlying conglomerate and underlying sandstone? 
A)The conglomerate was deposited by the wind. 
B)There was a gradual switch from marine to nonmarine conditions. 
C)There was a gradual switch from nonmarine to marine conditions. 
D)There was an abrupt event,such as a flood.

Quizplus · Accepted Answer

The contact between an overlying conglomerate and underlying sandstone suggests an abrupt event, such as a flood, that caused the deposition of the conglomerate layer on top of the sandstone layer. This indicates a sudden change in the depositional environment, rather than a gradual switch between marine and nonmarine conditions. There is no indication that the conglomerate was deposited by the wind.

What Can You Infer from This Contact Between an Overlying