Question
This photograph shows rock strata in the Big Horn Mountains of Wyoming. It also shows the site of an unconformity in the rock strata right in the center of the view. Review the statements. Which does NOT correctly describe why this could be considered an unconformity?
Responses
A An older layer is exposed to erosion.An older layer is exposed to erosion.
B An igneous intrusions cuts through the rock layers.An igneous intrusions cuts through the rock layers.
C There is a break in the sedimentary geological record.There is a break in the sedimentary geological record.
D Eroded layers are buried by deposition of younger sediments.
Responses
A An older layer is exposed to erosion.An older layer is exposed to erosion.
B An igneous intrusions cuts through the rock layers.An igneous intrusions cuts through the rock layers.
C There is a break in the sedimentary geological record.There is a break in the sedimentary geological record.
D Eroded layers are buried by deposition of younger sediments.
Answers
GPT-4o mini
The statement that does NOT correctly describe why this could be considered an unconformity is:
B An igneous intrusion cuts through the rock layers.
Unconformities are typically characterized by a gap in the geological record caused by erosion or a period of non-deposition. An igneous intrusion involves the intrusion of molten rock into existing layers, which is not a feature of unconformity. Instead, it represents a different geological process.
B An igneous intrusion cuts through the rock layers.
Unconformities are typically characterized by a gap in the geological record caused by erosion or a period of non-deposition. An igneous intrusion involves the intrusion of molten rock into existing layers, which is not a feature of unconformity. Instead, it represents a different geological process.