1.) Trace Fossil: Any indirect evidence left by an organism.
2.) Molds and Casts: An impression of an organism.
3.) Replacement: original material of an organism; replaces with minerals that can leave detailed replicas of hard or soft parts.
4.) Petrified or Per-mineralized: empty pore spaces are filled by minerals such as wood.
5.) Amber: preserved tree sap traps an entire organism.
6.) Original Material: mummification or freezing preserves original organism.
Hope this helps :)