Researchers have found a remarkable effect while studying how marine particles sink, which could affect the way scientists assess global carbon fluxes.
Ammonites are an group of marine animals of the subclass Ammonoidea in the class Cephalopoda. They are excellent index fossils, and it is often possible to link the rock layer in which they are found to specific geologic time periods.mmonites are an group of marine animals of the subclass Ammonoidea in the class Cephalopoda. They are excellent index fossils, and it is often possible to link the rock layer in which they are found to specific geologic time periods.
Browse Ammonites For Sale. 1  Ammonites used a biological pump and siphon system to control their buoyancy. 2  Only a few species of Ammonites survived each of several extinction events. 3  Ammonites are used as index fossils.  Septae separated the gas chambers within the shell. Their suture points create beautiful patterns.