When rock layers do not represent the entire sequence of time,but rather a gap of time is evident between the layers,this gap is called a(n)
A) unconformity.
B) joint.
C) fault
D) dike.
E) erratic.

Question

Quizplus · Accepted Answer

An unconformity represents a gap or missing time in the rock record, where there is an interruption in the sequence of rock layers due to erosion, non-deposition or deformation. Joints and faults are terms used to describe fractures in rocks, while dikes refer to vertical intrusions of magma, and erratics are large boulders transported by glaciers. None of these terms is specifically related to missing time in the rock record.

When Rock Layers Do Not Represent the Entire Sequence of Time,but