A fossil is the remains of a dead plant or animal pressed against rock or mold.
What type of rock are they found in?
Types of rock that normally lack fossils are metamorphic rocks (formed from sedimentary rock under heat and pressure), and igneous rocks(the result of molten or volcanic rock that later cooled). The rocks which Fossils are mostly found in are sedimentary rocks.
How are they formed?
Fossils are formed in a number of different ways, but most are formed when a plant or animal dies in a watery environment and is buried in mud and silt.Over time sediment builds over the top and hardens into rock.
Example of how they are formed.
There are several processes that plants and animals can be a Fossil. An example of how they are formed is when a dinosaur bone is buried under soil and sand and hardens against a rock to make an imprint of a dinosaur bone.