3.7" Fossil Crab (Potamon) Preserved in Travertine - Turkey

This is a fascinating fossil freshwater crab (Potamon sp.) preserved in travertine from the Denizli Basin in Southwest Turkey. The crab itself is 3.7" wide (including legs) and exhibits very detailed, 3d preservation. It's preserved as a three-dimensional outer cast within a natural cavity in white travertine. The back of the carapace is broken open, providing a look into the interior of the crab.

Travertine is a type of limestone that forms around mineral springs. It is often quarried for use as a building material, and that is how these crabs were discovered. They are found when hollow voids are cut into while sawing blocks of travertine. The travertine deposits in the Denizli Basin are Pleistocene in age, having been formed within the past 400,000 years.

A paper on these travertine preserved crabs can be found at the link below.

Unusual scaled preservation samples on freshwater decapods (Crustacea, Decapoda) from the Pleistocene (Late Cenozoic) of Turkey and Kazakistan