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Browse more than 82,000 reports authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.

Filter Total Items: 83829

The composition of crinoid skeletons

No abstract available.
Authors
F. W. Clarke, W. C. Wheeler

The composition of muds from Columbus Marsh, Nevada

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 well near the old well 400 and the collection of a set of surface samples of muds from the marsh. This explora
Authors
W.B. Hicks

The Cretaceous-Eocene contact in the Atlantic and Gulf Coastal Plain

No abstract available.
Authors
L. W. Stephenson

The discharge of Yukon River at Eagle, Alaska

No abstract available.
Authors
E.A. Porter, R. W. Davenport

The Ellamar district, Alaska

No abstract available.
Authors
Stephen Reid Capps, Bertrand Leroy Johnson

The fauna of the Batesville sandstone of northern Arkansas

The beds in northern Arkansas that lie between the Boone limestone (commonly regarded as representing the Burlington and Keokuk epochs) and the Pennsylvanian have been divided into several formations, named, in ascending order, Moorefield shale, Batesville sandstone, Fayetteville shale, and Pitkin limestone. These formations presumably are equivalent to those that hold a corresponding position in
Authors
George H. Girty

The fractional precipitation of some ore-forming compounds at moderate temperatures

No abstract available.
Authors
Roger Clark Wells

The history of a portion of Yampa River, Colorado, and its possible bearing on that of Green River

Few regions offer more interesting geologic problems relating to drainage than the Uinta Mountains, in Utah and Colorado, and the ar3a immediately east of them. In fact, the writer's attention was primarily attracted to this field by the diversity of opinion regarding the antecedent origin of Green River. Although the present paper deals mainly with that portion of Yampa River east of Juniper Moun
Authors
E. T. Hancock

The inorganic constituents of echinoderms

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 and to ascertain whether they showed the same characteristics and regularity. A number of se
Authors
F. W. Clarke, W. C. Wheeler

The Mesozoic and Cenozoic Echinodermata of the United States

No abstract available.
Authors
William Bullock Clark, Mayville William Twitchell

The Montana Group of northwestern Montana

No abstract available.
Authors
Eugene Stebinger

The phosphate deposits of Florida

No abstract available.
Authors
George Charlton Matson