Ammonite shells are used today as index fossils, meaning they can help date other fossils that are found in the same layer of marine rock. These cephalopods make for ideal index fossils because ...

They had intricate, coiled shells, which often displayed complex ... they know the age of the geological structure — this makes ammonites index fossils. Ammonites are primarily found in marine ...

The fossil that was originally interpreted to be a plant, but researchers have now discovered is the inside of the shell of a baby turtle. Disclaimer: AAAS and EurekAlert! are not responsible for ...

We have examined fossil bivalve shells to try to determine whether the obvious growth lines on the shells are related to tidal or other environmental phenomena. Although the study is continuing ...

In the Kits: #12: Shark tooth (specifically, the enamel of the tooth) Recrystallization - A process by which the minerals making up the original shell or bone of a fossil change into a different ...

Fossil shell of Pithocerithium rubiginosum (height is 1.5 cm) from the Miocene sediments of Nexing in Austria (left) and isolated reddish polyene pigments on calcium fluoride disc (diameter of ...