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Temporal range: Serpukhovian
Thrinacoselache gracia.jpg
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Family: Thrinacodontidae
Genus: Thrinacoselache
Grogan & Lund, 2008
  • T. graciaGrogan & Lund, 2008
  • T. ferox(Turner, 1982)
  • Thrinacodus feroxTurner, 1982

Thrinacoselache is an extinct genus of basal elasmobranch from the Serpukhovian-aged lagerstatte, Bear Gulch, of what is now Montana. [1]

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Alder Gulch

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Confederate Gulch is a steeply incised gulch or valley on the west-facing slopes of the Big Belt Mountains in the U.S. state of Montana. Its small stream drains westward into Canyon Ferry Lake, on the upper Missouri River near present-day Townsend, Montana. In 1864, Confederate soldiers on parole during the American Civil War made a minor gold discovery in the gulch, but the discovery of the sensationally rich Montana Bar the following year—one of the richest placer strikes per acre ever made—led to other rich gold strikes up and down the gulch, and touched off a frantic boom period of placer gold mining in the area that extended through 1869. From 1866 to 1869, the gulch equaled or outstripped all other mining camps in the Montana Territory in gold production, producing an estimated $19–30 million worth of gold. For a time, Confederate Gulch was the largest community in Montana. In 1866, Montana had a total population of 28,000, and of these, about 10,000 (35%) were working in Confederate Gulch.

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  1. Grogan, Eileen D.; Lund, Richard (2008). "A basal elasmobranch, Thrinacoselache gracia n. gen and sp., (Thrinacodontidae, new family) from the Bear Gulch Limestone, Serpukhovian of Montana, USA". Journal of Vertebrate Paleontology. 28 (4): 970–988. doi:10.1671/0272-4634-28.4.970.