Examine the geologic cross section. - more
Geologists describe an unconformity as a place where they expect to see a rock layer, but at least some of the rock layer is missing. What most likely caused the two unconformities, and which two rock
layers appear to have an unconformity?
A. Unconformities were caused by erosion; basalt and granite.
B. Unconformities were caused by deposition: shale and granite.
C. Unconformities were caused by mass wasting basalt and shale.
D. Unconformities were caused by compaction granite and alluvium.