Ammonites went extinct long back as marine animals of the subclass Ammonoidea in the class Cephalopoda, phylum Mollusca. Trilobites as arthropods from the class Trilobita went extinct during the Late Devonian extinction.

In the beginning of the nineteenth century, the first dinosaur fossils gave their appearance, and since then dinosaurs have become a part of the most fertile human imaginations. On the other hand, reptiles are cold-blooded vertebrates.

If oceanic fish fossils are found from below where land animal fossils have already been, it tells us that at some time in the remote history the area was part of an ocean or some lake over there. Crinoids are marine animals too, in the class Crinoidea.

Amber fossils are resin or tree sap that has been fossilized acquiring beautiful colors and shapes and hence are used as gems in jewelry. They can also hold insects making insect fossils, or even small mammals inside while fossilizing.

Mammal fossils are very helpful in discovering ancient species of mammals and studying their structure as well as their behavior through them.

Plant fossils are preserved parts of dead plants, the commonest of them being the compression fossils. Their ages range from a few hundred years to many million years old. One of the most beautiful of these botanical fossils is petrified wood.

A shark often survives but only as fossils in its teeth! Sharks teeth fossils are sometimes as ancient as millions of years old. The most common of them are from the Cenozoic Era, i.e., around 65 million years ago.

Fossil Reproductions are supposed to offer quality fossil replicas and casts. As they can be afforded more easily than real fossils, their use in education is holding its roots firm. Usually dinosaurs, fish, ammonites, and tribolites are reproduced thus.

Fossils are of many kinds depending on their ways of preservation of which the main are permineralization, casts and molds, replacement and re-crystallization, compression, bioimmuration, trace, micro fossilizing, resin fossilizing and pseudo fossilizing.