An erosional surface that separates older metamorphic or plutonic rocks from younger overlying sedimentary rocks is called a(n) ____.
A) angular unconformity
B) disconformity
C) nonconformity
D) hiatus
E) bedding plane

Question

Quizplus · Accepted Answer

A nonconformity is an erosional surface that separates older metamorphic or plutonic rocks from younger overlying sedimentary rocks. An angular unconformity is an erosional surface that separates tilted sedimentary rocks from the overlying horizontal sedimentary rocks. A disconformity is an erosional surface that separates parallel layers of sedimentary rocks, but with a time gap in between the layers. A hiatus is a gap in the geologic record where there is no deposition or preservation of rock. A bedding plane is a flat surface that separates two layers of sedimentary rock.

An Erosional Surface That Separates Older Metamorphic or Plutonic Rocks