Discussion
What is the name of an erosional surface that separates two sets of sedimentary layers with non-parallel planes ?
Answer: D
It is an angular unconformity.
An angular unconformity forms when older layers are tilted or folded, eroded, and then covered by younger layers deposited flat. The erosion surface therefore separates two sets of beds that are not parallel to each other.
A nonconformity is an erosion surface between sedimentary rocks and underlying igneous or metamorphic rock, not between two sedimentary sets. Cross-bedding is inclined layering within a single bed, not an erosional surface, and a formation is a mappable unit of rock, not a surface.
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