What are fossils
Fossils are shells or bones that had died and they were left over thousands of years and sometime turn to stone.
What type of rock are they found in?
The fossils are found in igneous rock that is most commonly found with fossils. =)
How are they formed?
Usaully, The types of fossils that are formed are usaully frozen in ice and found by scientest or in the earth that there predater killed and there shell was left and rotted into the earth.