Contents of 7.5 How do you recognize gaps in the rock record?

Image of the Grand Canyon showing angular unconformity

cross sections showing deposition of flat lying sedimentary layers, uplift, and erosion of the layers

7.5 How do you recognize gaps in the rock record?

Unconformities - a gap in the rock record when erosion occurred rather than deposition.

angular unconformity

Fig 7.11

An angular unconformity is the meeting of two layers that are inclined at different angles to one another.