What sequence of events would have to occur in order to produce the unconformity shown here?

What will be an ideal response?


Answer: First the lower units (purple/white) would have had to be deposited as horizontal layers. Then they got folded. The top got eroded off by some amount. A layer of pebbles was deposited atop this eroded surface (making it an angular unconformity), and then some shale or other fine-grained sediment was deposited on top of that. Finally, I suppose, something had to erode or cut into all three layers and the unconformity to expose the cross-sectional view we see here.

Environmental & Atmospheric Sciences

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