Question

this diagram shows fossils in an undisturbed sedimentary rock sequence. shallower deeper which of the following fossils is younger? select the more likely answer. palm leaf fern

Explanation:

In undisturbed sedimentary rock layers, the principle of superposition states that younger layers are deposited on top of older layers. So fossils in shallower (upper) layers are younger than those in deeper (lower) layers. The palm leaf fossil is in a higher (shallower) layer than the fern fossil.

Step1: Recall superposition principle.

In undisturbed sedimentary rocks, upper layers are younger.

Step2: Compare fossil layers.

Palm leaf is in a higher layer than fern. So palm leaf fossil is younger.

Answer:

A. palm leaf (assuming the first option is palm leaf as per the diagram's lower choices, with the palm leaf being in the middle layer which is above the fern's deeper layer)