Question

The table below shows the age of fossils found in four separate layers of an undisturbed rock:


Fossils In Rock Layers
Layer Fossil in Layer Age of Fossil (million years)
A W 550
B X 240
C Y 680
D Z 450


Which is the topmost layer of the rock?
Layer A
Layer B
Layer C
Layer D

Answer 1

B because it is the youngest layer. The order it goes in is B, D, A, C.
Hope this helped!!!!! :)

Answer 2

The topmost layer of the rock is : Layer B

From the table the layer B is 240 million years and it is the youngest layer. While the oldest layer in the table is Layer C which is 680 million years old.

During the arrangement of rock layers of an undisturbed rock ( i.e. rock that has not undergo any form of metamorphosis either artificially or naturally ) the oldest layer of the rock is found at the base of the rock while the youngest layer is situated as the topmost layer of the rock.

Hence we can conclude that the topmost layer of the rock is Layer B

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