ES2902  Observe an animation showing the formation of an unconformity.
  !   Click the image to see the animation. Use the movie controls to examine the stages.

An unconformity is a gap in the sedimentary rock record. This animation shows the formation of an angular unconformity—one where the layers above and below the unconformity are not parallel to each other, but form an angle. Examine how the final result allows you to infer the sequence of the rocks' formation.

Jennifer Loomis, TERC