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The Bear Gulch Limestone is commonly considered to be part of the Heath Formation, the youngest formation in the Big Snowy Group of central Montana. [1] [14] [2] [15] Some authors instead consider the Bear Gulch Limestone to be an early member of the Tyler Formation, a patchy but widespread unit of Carboniferous limestone and terrestrial sediments.
Heteropetalus is a genus of chondrichthyan from the Mississippian age Bear Gulch Limestone of Montana, United States. One species, H. elegantulus, is known. [1] [2] Known fossils of Heteropetalus are exceptionally well preserved, displaying details of the soft tissue anatomy such as an opercular cover over the gills. [3]
Paintings known as pictographs are still visible in Pictograph Cave, which is the largest of the three caves. The pictographs are thought to be between 200 and 2,100 years old. However their interpretations are still debated over. The oldest pictograph is that of a turtle, radio-carbon dated to be approximately 2,100 years old.
English: †Paratarrasius hibbardi Lund and Melton Jr. 1982 from the Mississippian (Serpukhovian) Heath Formation of Bear Gulch, Montana. Collection oilshale. Collection oilshale. Deutsch: † Paratarrasius hibbardi Lund and Melton Jr. 1982 aus dem Karbon (Serpukhovium) der Heath Formation von Bear Gulch, Montana.
†Paratarrasius hibbardi Carboniferous Bear Gulch, Montana †Pegmatrea – or unidentified related form †Pelagiella †Peltabellia †Peltabellia willistoni – type locality for species †Pennireptepora; Fossilized theca of the Carboniferous blastoid echinoderm ("sea bud") Pentremites †Pentremites †Perditocardinia †Pericyclus
It is known from the Serpukhovian-aged lagerstätte of the Bear Gulch Limestone of Montana, United States. It is one of the genera included in the family Gregoriidae . [ 3 ] [ 4 ]
Fossils have been discovered in Bear Gulch Limestone, Montana, USA. [1] Restoration. Allenypterus montanus. Heath Formation, Bear Gulch, Montana (USA).
Fossils of the species were found in the Bear Gulch Limestone in Montana, United States. Both species have rounded bodies and paddle-like tails as well as large pectoral fins, two dorsal fins and a jaw fused to the braincase. [4] The paddle-like tails indicate that E. meltoni was likely not a predator nor a fast swimmer. [5] [6]