There are three types of unconformities, nonconformity, disconformity, and angular unconformity. A nonconformity occurs when sedimentary rock is deposited on top of igneous and metamorphic rocks as is the case with the contact between the strata and basement rocks at the bottom of the Grand Canyon.

What are types of relative dating?

Principles of relative datingUniformitarianism. Intrusive relationships. Cross-cutting relationships. Inclusions and components. Original horizontality. Superposition. Faunal succession. Lateral continuity.More items

What is the law of relative dating?

Law of Superposition Relative age means age in comparison with other rocks, either younger or older. New rock layers are always deposited on top of existing rock layers. Therefore, deeper layers must be older than layers closer to the surface. This is the law of superposition.