If a mass of granite is in contact with a layer of sandstone that contains small pieces of the granite, which rock is older?

Question

neither; they are the same age

the granite

the sandstone

Answer 1

In situations like this, you can use the principle of inclusions in geology, which states that any rock fragments (inclusions) found within another rock must be older than the rock that contains them. Since the sandstone contains small pieces of granite, it indicates that the granite must be older than the sandstone. Therefore, the older rock is the granite.

So the correct answer is the granite.