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The Centennial Range of southwestern Montana and adjoining parts of Idaho is a large east trending fault block, upthrown on the north side, and bounded on the north by the downthrown Centennial Valley block* The strata' in the range dip gently south under the Snake. River i lava fields. In the Centennial Range the Phosphor ia formation of Permian age is « divisible into five members, designated A to E from bottom to top of the formation. It is about 200 feet thick in the range, where ijb disconformi* ably overlies the Penns^lvanian Quadrant formation and grades into the overlying Triassic BLnwoody formation. The A, C, and E members include carbonate and siliceous rocks, and the B and D melnbers contain phosphate rock. The B member contains as much as 6 feet or more of high-grade (31 percent or more P~0-) phosphate rock, mostly in one layer which is the chief potential producing horizon* The D member contains a few thin */ high-grade beds of phosphate rock interspersed through a sequence of black shale. Fluorine and trace amounts of uranium and other elements are present */ . , in the phosphate rook of both members* ,. The gently dipping phosphate rock beds generally are overlain by less than 500 feet of younger strata within the mapped area* Underground mining would seem to be the best method for potential exploitation of the deposit, ' '» but further exploration including core drilling and trenching is needed*, Reserves of high-grade phosphate rock in the Centennial Range may total several scores of millions of tons*

Preliminary report on geology of the phosphate deposits in the Centennial Range, Montana-Idaho