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Page 7110, results 177726 - 177750

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Phosphate rock in the Three Forks-Yellowstone Park region, Montana: Chapter G in Contributions to economic geology (short papers and preliminary reports), 1927: Part I - Metals and nonmetals except fuels
D. Dale Condit, E.H. Finch, J. T. Pardee
1927, Bulletin 795-G
The region described is about 7,000 square miles in area. It includes most of Gallatin and Madison Counties, in Montana, and some contiguous parts of Idaho and Wyoming. Within it are several broad fertile valleys and a number of prominent mountain ranges. A considerable part is underlain by a bed...
Contributions to economic geology (short papers and preliminary reports), 1927: Part I - Metals and nonmetals except fuels
Gerald Francis Loughlin, George Rogers Mansfield
1927, Bulletin 795
The Geological Survey's "Contributions to economic geology" are published in two parts, one including papers on metals and nonmetals except fuels and the other including papers on mineral fuels. As the subtitle indicates, most of the papers in these volumes are of three classes (1) short papers describing as thoroughly...
The brown iron ores of west-middle Tennessee
E. F. Burchard
1927, Bulletin 795-D
A study of the brown iron ore deposits of west-middle Tennessee has been carried on recently under a cooperative agreement between the Tennessee State Geological Survey and the United States Geological Survey. A detailed report on the subject was submitted in the spring of 1925 to the State Survey for...
A comparison of the genera Metaplacenticeras Spath and Placenticeras Meek
John B. Reeside Jr.
1927, Professional Paper 147-A
In a recent examination of a considerable suite of specimens from the Western Interior of the United States belonging to the Cretaceous ammonite genus Placenticeras Meek the writer made comparisons of the species from the Interior with those from the Cretaceous of the Pacific coast ordinarily designated Placenticeras pacificum J....
American Tertiary mollusks of the genus Clementia
W. P. Woodring
1927, Professional Paper 147-C
Aside from its value as an aid in determining the age of Tertiary beds, the chief interest of the genus Clementia lies in the anomalous features of its present and former distribution. An attempt is made in this paper to trace its geologic history, to point out its paleobiologic significance,...
The Montana earthquake of June 27, 1925
J. T. Pardee
1927, Professional Paper 147-B
The earthquake of June 27, 1925, in Montana caused considerable damage within an area of 600 square miles or more, the center of which is in latitude 46° 5' N. and longitude 111° 20' W., a short distance southeast of Lombard. It was a seismic disturbance of the first...