Fossil relative dating lab
This, of course, assumes you haven't searched through the pile and changed the order of the newspapers just as the law of superposition assumes no major Earth changing event has occurred in that area.
In the Coleoidea, the molluscan shell has been internalized or is absent, whereas in the Nautiloidea, the external shell remains.
About 800 living species of cephalopods have been identified.
Two important extinct taxa are the Ammonoidea (ammonites) and Belemnoidea (belemnites). None of them can tolerate freshwater, but the brief squid, Lolliguncula brevis, found in Chesapeake Bay, is a notable partial exception in that it tolerates brackish water.
A fossil can be defined as any trace or artifact of life.
Fossils can give clues to the past and history of life on Earth.The dead organism needs to be buried under sediments and have a lot of pressure put on them.