Coal
Biogenic.
Igneous
Clastic Sedimentary Rocks.
volcanic rocks
Extrusive igneous rocks
Biogenic.
sedimentary rock
sedimentary
sedimentary
Extrusive igneous rocks are one type of rocks that can be formed above the ground. Sedimentary rocks can also be formed above the ground.
Many rocks can contain fossil organisms. Generally speaking, sedimentary rocks are the rock type that contains the most fossil organisms. Coquina, a type of limestone, is formed nearly completely by the shells of marine organisms. And coal is a sedimentary rock composed of the remains of ancient swamp plants.
Igneous
Clastic Sedimentary Rocks.
sedimentary rocks
Rocks that are formed by layers of sediments that are compacted over time are appropriately named sedimentary rocks.
Extrusive igneous rocks.
volcanic rocks