The cross sections below represent three geologic columns, I, II, and III, exposed at three different

locations. The rock layers have not been overturned. Letters A through E represent different fossils.

Which rock layer is the youngest?

(1) green shale containing fossil B in column I

(2) glacial soil containing fossil E in column III

(3) brown sandstone containing fossil C in column II

(4) gray limestone containing fossil D in column I

The cross sections below represent three geologic columns, I, II, and III, exposed at three different locations. The rock layers have not been overturned. Lette class=