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Structural-stratigraphic framework and correlation of coal beds in the Tongue River and Sentinel Butte Members of the Fort Union Formation, Daglum 15-minute quadrangle, Billings, Stark, and Slope Counties, North Dakota
Jim S. Hinds
1983, Miscellaneous Field Studies Map 1345-A
The Daglum quadrangle of southwestern North Dakota (see index map) is underlain by 11 lignite beds that exceed 5 ft in thickness within the Sentinel Butte and Tongue River Members of the Fort Union Formation.  Six of these bed crop out within the quadrangle.  This report illustrates the stratigraphic position,...
Map and interpretation of geochemical anomalies in the White Mountains, Blanco Mountain, Birch Creek, and Black Canyon Roadless Areas, White Mountains, California and Nevada
Michael F. Diggles
1983, Miscellaneous Field Studies Map 1361-B
The geochemical results show the most anomalous part of the study area to be the White Mountain Fault zone along the northwestern range front.  Silver, lead, and zinc mineralization in calcareous rocks, porphyry copper in dikes, gold-arsenic quartz vein deposits, tungsten and molybdenum tactite mineralization, and argillic alteration zones are...
Habitat Suitability Index Models: Mink
Arthur W. Allen
1983, FWS/OBS 82/10.61
The mink (Mustela vison) is a predatory, semiaquatic mammal that is generally associated with stream and river banks, lake shores, fresh and saltwater marshes, and marine shore habitats (Gerell 1970).  Mink are chiefly nocturnal and remain active throughout the year (Marshall 1936); Gerell 1969; Burgess 1978)....
Habitat Suitability Index Models: Littleneck clam
Kenneth Rodnick, Hiram W. Li
1983, FWS/OBS 82/10.59
The littleneck clam, a member of the family Veneridae, is a hardshell species found in estuaries, bays, sloughs, and open coastl ines along the Pacific coast. This clam primarily inhabits the intertidal zone, but also occurs in subtidal areas (Hancock et ale 1979). It ranges from the Aleutian Islands to...
Supporting data for Environmental Trends
D.B. Tunstall
1983, Open-File Report 83-534
Information has been compiled as a companion document to ' Environmental Trends ' to provide analysts and researchers with statistical data to understand better how natural and man-made environments were changing. Subjects include land and climate; wetlands; wild areas; historic places; risk zones; settlement patterns; housing units; housing conditions; neighborhood...
Habitat Suitability Index Models: Gulf of Mexico American Oyster
Edwin W. Cake Jr.
1983, FWS/OBS 82/10.57
The American or eastern oyster (Crassostrea virrinica [Gmelin]), a bivalve in the family Ostreidae, is an important commercia and recreational species along the Atlantic and Gulf of Mexico coasts of North America and other areas (U.S. Pacific coast and Hawaii) where it has been introduced (Galtsoff 1964). It evolved over...
Habitat Suitability Index Models: Yellow perch
Douglas A. Krieger, James W. Terrell, Patrick C. Nelson
1983, FWS/OBS 82/10.55
A review and synthesis of existing information were used to develop riverine and lacustrine habitat models for yellow perch (Perca flavescens). The models are scaled to produce an index of habitat suitability between 0 (unsuitable habitat) to 1 (optimally suitable habitat) for riverine, lacustrine, and palustrine habitat in the 48...
Habitat Suitability Index Models: Northern Gulf of Mexico brown shrimp and white shrimp
Robert Eugene Turner, Michael S. Brody
1983, FWS/OBS 82/10.54
A review and synthesis of existing information were used to develop estuarine habitat models for brown shrimp (Penaeus aztecus) and white shrimp (Penaeus setiferus). The models are scaled to produce an index of habitat suitability between 0 (unsuitable habitat) to 1 (optimally suitable habitat) for estuarine areas of the northern...
Habitat suitability index models: redhead (wintering)
Rebecca J. Howard, Harold A. Kantrud
1983, FWS/OBS 82/10.53
The redhead is a North American waterfowl species with economic as well as ecological importance. It is highly desired by hunters. Retrieved redhead kill in the United States averaged 143,000 birds during the three waterfowl seasons from 1975 to 1977 (U.S. Department of the Interior 1981a, 1981b). Populations on the...