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.
Female ammonites grew up to 400 percent larger than males, presumably to make room to lay eggs. Size relative to a 6-ft (2-m) man: Ammonites were predatory, squidlike creatures that lived inside coil-shaped shells.Like other cephalopods, ammonites had sharp, beaklike jaws inside a ring of tentacles that extended from their shells to snare prey such as small fish and crustaceans.emale ammonites grew up to 400 percent larger than males, presumably to make room to lay eggs. Size relative to a 6-ft (2-m) man: Ammonites were predatory, squidlike creatures that lived inside coil-shaped shells.