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by Stratigraphy.net
New from Snet: Lithologs, a new tool to create lithological/sedimentological logs online..

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AMMONITE: INDEX FOSSILS AS TIME KEEPERS

Argonauticeras besairei, José Juárez RuizAn exceptional example of the fractal building of an ammonite septum, in this clytoceratid Argonauticeras besairei from the awesome José Juárez Ruiz.Ammonites were predatory, squidlike creatures that lived inside coil-shaped shells.Like other cephalopods, ammonites had sharp, beak-like jaws inside a ring of squid-like tentacles that extended from their

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