The fossils can be classified into distinct categories based on specific criteria of formation. The types of fossils are- Direct Fossils: Formed by the burial of dead living organisms and their skeletons. Chemo-Fossils: Fossils formed of chemical deposits of prehistoric life. Ichno - Fossils: Formed because of the parts that do not belong to a living organism like a footprint, faeces, nests, eggs, etc. Resin Fossils: Formed by organisms getting trapped wholly inside the amber resin.  Body Fossils: Formed in the hard parts of the body like bones, claws and teeth. Living Fossils: These are the fossils of prehistoric organisms that carry a strong resemblance with some present species.