What can geologists learn about a region's history if they discover an angular unconformity in a rock sequence?

An angular unconformity forms when older sedimentary layers are deposited, tilted or folded, and eroded before newer layers are deposited on top at a different angle. This sequence shows that deposition was interrupted by deformation and erosion. Therefore, choice B, “Sediment layers were deposited and deformed, and then new sediment layers were deposited,” best describes the region’s history.

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