What Are Fossils?
External Mold Fossils
A fossil that are imprints of the organism embedded in rocks.Like foot prints and etc.
Mummification Fossil
A fossil that preserves life form with some tissue or skin intact. Specimens preserved this way are very fragile. This is a rare form of "fossilization". Mummification is not truly fossilization.
Internal mold Fossils
These fossils occur when sediment fills the shell of a deceased organism. These remain after the organism's remains decompose to show the internal features of the organism
Replacement Fossils
These fossils occur when the hard parts of the organism are replaced with minerals over time.
Tar Fossils
When organisms become trapped in tar, due to the oxygen deprived environment, it allows for the rapid burial of body parts which are well preserved.
Trace Fossils
Fossils that aren't exactly part of the organism. These include footprints, burrows, and eggshells.
Fossils
The remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
Actual remain Fossils
These are much rarer than other fossil types. These are still intact parts of the organism. Actual remains can be seen preserved in ice, tar, or amber. A good example is mammoth hair. It is often frozen and still preserved.
Cast Fossils
These fossils are formed when external molds are filled with sediment.
Petrification Fossils
These fossils occur when minerals slowly replace the various organic tissues of an organism.
Recrystallization Fossil
These fossils occur when original minerals in the fossil over time revert into more stable minerals.
Carbonization Fossil
These fossils occur when over time all parts of the original organism except the carbon are removed from the fossil over time. The remaining carbon is the same carbon that the organism was made of.