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.
1 Chondrites - (kon-drites) meteorites which contain chondrules. Chondrules are minerals which formed small spheres while floating around in space. 2  Achondrites - (a-kon-drites) meteorites which do not contain chondrules. Many of these specimens originate from larger 'parent bodies' such as the Moon, Mars or an asteroid.