Yogonsicus gulo Bear Gulch Paleozoic Fish Fossil

Part and Counterpart

Yogonsicus gulo

Class Actinoptergyii, Paleoniscimorpha

Geological Time: Mississippian (~320 m.y.a.)

Size: Fish fossil is 65 mm; Matrix: 95 mm by 90 mm pair

Fossil Site: Heath Shale Formation, Bear Gulch Limestone, Fergus County, Montana

Fossil Code: BGF753

Price: Sold

Description: The Bear Gulch Limestone is a deposit of some 70 square km in extent and 30 m in depth that has been a source of one of the most diverse assemblages of fossil fish with some 110 species having been described over the past 30 years. Most were new to science, and provided a unique view of the marine environment of Mississippian times. Fine preservation of both fish and invertebrates is a hallmark of these deposits, presumably due to an anoxic depositional environment. This fish is a adult example of a species known as Yugoniscus gulo. The species name presumably derived from Gulo the genus to which the wolverine belongs. Perhaps the describer thought it was a particularly pugnacious fish. Note the finnage, vertebral column, and scales of this nice juvenile specimen.

Also see: Paleozoic Fish Fossils Bear Gulch Fish Fossils Species Bear Gulch Fossils Gallery

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