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The flora of the Catahoula Sandstone
Edward Wilber Berry
1916, Report, The Catahoula Sandstone; and The flora of the Catahoula Sandston; Professional Paper 98-M
During the progress of my studies of the fossil floras of the Gulf Coastal Plain, embracing all horizons from the Lower Cretaceous to the Pleistocene and prosecuted under the general direction of T. Wayland Vaughan, material representing the floras of all the major stratigraphic units in the area extending from...
The inorganic constituents of echinoderms
F. W. Clarke, W. C. Wheeler
1915, Professional Paper 90-L
In a recent paper on the composition of crinoid skeletons we showed that crinoids contain large quantities of magnesia, and that its proportion varies with the temperature of the water in which the creatures live. This result was so novel and surprising that it seemed desirable to examine other echinoderms...
The composition of muds from Columbus Marsh, Nevada
W.B. Hicks
1915, Professional Paper 95-A
The investigation of the dry lake of Columbus Marsh, in Nevada, which had for its economic motive the discovery of potash, was continued by the United States Geological Survey during the summer of 1913 under the supervision of Hoyt S. Gale. The work done included the drilling of a shallow...
Dike rocks of the Apishapa quadrangle, Colorado
Whitman Cross
1915, Professional Paper 90-C
The Apishapa quadrangle, the geographic relations of which are shown by Plate IV, is situated on the plains south of Arkansas River, in Colorado, about 24 miles east of the mountain front. The geology of the Pueblo, Walsenburg, Spanish Peaks, and Elmoro quadrangles, adjoining it on the northwest, west, southwest,...
Contributions to the stratigraphy of southwestern Colorado
Whitman Cross, E. S. Larsen Jr.
1915, Professional Paper 90-E
In the course of field work of the United States Geological Survey in the San Juan region of Colorado observations have been made in the last three seasons that considerably extend our knowledge of the great stratigraphic break below the La Plata sandstone, which is currently assumed to be of...
Erosion and sedimentation in Chesapeake Bay around the mouth of Choptank River
J. Fred Hunter
1915, Professional Paper 90-B
With the unfolding of geologic knowledge during the last century the processes of denudation, transportation of sediments, and sedimentation have become better understood, and to some extent their relative effects in bringing about the present configuration of the earth's surface have been determined. The nature of these processes has been...
Geology of the pitchblende ores of Colorado
Edson S. Bastin
1915, Professional Paper 90-A
The large amount of public interest that has recently been manifested in radium because of the apparent cures of cancer effected by certain of its emanations makes it desirable to place before the public as promptly as possible all available information in regard to the occurrence of the minerals from...