Question

Grand Canyon NP, AZ. The surface dividing the units in Problem 3 is called the "Great Unconformity" because it separates older layered Precambrian units from the younger sedimentary Cambrian unit with up to a 1-billion-year gap in the rock record due to erosion. What type of unconformity is it at this location?

Answer 1

Answer:

Non-conformity

Explanation:

The Precambrian rocks are mainly characterized by the presence of igneous and metamorphic types of rocks, typically schist, gneiss, and granite. These are much older than the Cambrian sedimentary rocks.

The unconformities are usually defined as the time of non-deposition, which creates gaps in the geological rock sequences.

The type of unconformity that occurs in the above-given condition is the non-conformity. This type of unconformity is found when the older igneous or metamorphic rocks are underlain by the younger sedimentary rocks.