Question

If a layer of sandstone lies on top of a layer of limestone in which a 300-million-year-old fossil is found, and there are no unconformities, the layer of sandstone must be ____.

a. older than 300 million years
c. about 300 million years old
b. younger than 300 million years
d. older than 600 million years

Answer 1

The answer to the question presented above would be b. younger than 300 million years. If a layer of sandstone lies on top of a layer of limestone in which a 300-million-year-old fossil is found, and there are no unconformities, the layer of sandstone must be younger than 300 million years.

Answer 2

The answer is B: younger than 300 million years. Layers of sedimentary rock are usually used by geologists ad palaentotolgist to date back time. This is because the different layers are deposited over millions of years and have properties related to the different eras and peroids in which they were deposited. Therefore the toppest layers (in relation to the other layers) is younger in age than those layers below.