Palaeocaris typus Mazon Creek Crustacean Fossil

Name: Palaeocaris typus

Subphylum: Crustacea; Class Maxillopoda; Subclass Eumalacostraca; Superorder: Syncarida

Geological Time: Pennsylvanian (~300 m.y.a.)

Size : 25 mm long in a 35 mm by 30 mm and 33 mm by 25 mm nodule

Fossil Site: Mazon Creek, Pit 11, Francis Creek shale, Morris, Illinois (Mazon Creek)

Mazon Creek Crustacean FossilDescription: The Mazon Creek deposits of the region near Braidwood, Illinois rival the other famous Lagerstatten of the Burgess Shale, Solnhofen, and Liaoning for the variety of detailed life preserved. Many exquisitely preserved specimens are found in the ironstone nodules that make up the Mazon Creek Lagerstatte. The majority of collecting areas are the spoil heaps of abandoned coal mines, the most famous of which is Peabody Coal Pit 11 from which this particular fossil was recovered. Pit 11 now serves as a cooling pond for the Braidwood nuclear power plant, but with over 100 other localities, specimens still come to light. This specimen is of a genus that is typically poorly preserved in the Essex fauna, making this an unusual specimen.

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