Question

If horizontal sedimentary strata overlie tilted strata (and no fault is present), the surface between the horizontal and tilted strata must be a(n) ________.

a. conformable sedimentary contact.
b. angular unconformity.
c. disconformity.
d. nonconformity.

Answer 1

Answer: b. angular unconformity

Step-by-step explanation:

Unconformity signifies a discontinuous sediment deposit and describes any period of discontinuity in the formation of a rock. It happens when an older layer erodes before a top layer is formed.

An angular unconformity is when horizontal sediments are deposited on top of a tilted layer, washed away by erosion and no fault is present.

A disconformity describes when this happens between sedimentary layers while a nonconformity exists between sedimentary rocks and other rock types such as an igneous rock.