The flora of the Great Falls coal field, Montana

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Abstract
a brief description of the coal basin which underlies the country about the Great Falls of the :MisEouri in Montana, and I am now able to add some facts of more than usual geological interest to those before known in regard to this coal field.The Great Falls coal basin lies on the north slope of the Belt and Highwood Mountains; the strata ail dipping toward the north.These mountains are subordinate folds of the Rocky Mountain system and are each composed of a granitic Archalan nucleus, locally overlain by a great thickness of Cambrian rocks which are best seen about Sulphur Springs.This formation must be at least 10,000 feet in thickness, and it underlies the surface from a point fifteen miles north of Sulphur Springs to neal' Townsend on the south.Splendid exposures of the same group are seen in Prickly Peal' Oanon on the road from Hel!'llla to Great Falls.They consist of numerous alternation!5 of thin bands of fine grained sandstone and argillaceous shale, generally metamorphosed into quartzite and slate.Neal' Sulphur Springs is an outcrop of limestone converted into marble.The prevailing color of the rocks of this group is gray at the surface, darker below.No distinct fossils were found in the slate though particles of carbonaceous matter abound everywhere.A shaly sandstone which apparently overlies all the series described is largely made up of Primordial trilobites.On the summit and the north slope of the Belt mountains the Archrean granite nucleus is overlain by Potsdam sandstone full of Soolithu8 and casts of sea-weeds.There are here nu-* The materials on which Prof. Fontaine based the identification of these species are insufficient for satisfactory comparison; and whIle it is not impossible that the life of one or more species may have stretched over all the interval between the beginning and end of the Cretaceous age, stronger evidence of this fact than any we yet have must be furnished before we can consider it as established.
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Authors J. S. Newberry
Journal american journal of science
Year 1891
DOI
10.2475/ajs.s3-41.243.191
URL
https://doi.org/10.2475/ajs.s3-41.243.191
Keywords Keywords not found

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