Over time, the sediments pile up to form horizontal layers of sedimentary rocks. The bottom layer of rock forms first, which means it is oldest. Each layer above that is younger, and the top layer is youngest of all.

Which rock is the youngest rock?

sedimentary rock The principle of superposition states that the oldest sedimentary rock units are at the bottom, and the youngest are at the top.

Which rock layer was the youngest quizlet?

There is an order in a rock formation, the oldest rocks are in the bottom layer and the youngest rocks are in the top layer. Geologists have developed a set of principles to compare the ages of rock layers.

Which one is the oldest layer?

The age of an object in comparison with the age of other objects. One of Stenos principles that states that in a sequence of sedimentary rock layers, the oldest layer is at the bottom and the youngest layer is at the top. A boundary between rocks of very different ages.

How can you tell which rock layer is oldest?

Sedimentary rocks are deposited one on top of another. Therefore, the youngest layers are found at the top, and the oldest layers are found at the bottom of the sequence.

What is the principle that in undisturbed rock layers the oldest rocks are on the bottom?

the principle of superposition According to the principle of superposition, in undisturbed layers of rock, the oldest rocks are on the bottom and the rocks become progressively younger toward the top.