Question

If you examine a rock sample and observe fossils in it, what type of rock does the sample represent?

Answer 1

Sedimentary rocks are the only ones that have the ability to preserve a fossil. As the years go by and more layers are added the fossil will always stay secure in the rock.

Answer 2

Sedimentary Rock
Here's Why:
Fossils also form from molds and casts. If an organism completely dissolves in sedimentary rock, it can leave an impression of its exterior in the rock, called an external mold.
I got this information from http://www.livescience.com/37781-how-do-fossils

I hope this helps:)