There may be a layer missing in the strata, or a set of sedimentary rock on top of metamorphic rock.

Plus, get practice tests, quizzes, and personalized coaching to help you succeed.Try It risk-free Discover how geologists study the layers in sedimentary rock to establish relative age.Learn how inclusions and unconformities can tell us stories about the geologic past.How do we use the Law of Superposition to establish relative dates?Let's look at these rock strata here: We have five layers total.