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Reference section for the Minturn Formation (Middle Pennsylvanian), northern Sangre de Cristo Range, Custer County, Colorado Reference section for the Minturn Formation (Middle Pennsylvanian), northern Sangre de Cristo Range, Custer County, Colorado
This reference section of the Middle Pennsylvanian Minturn Formation was measured in the northern Sangre de Cristo Range; the section provides a basis for comparison with the type Minturn and with possibly equivalent strata elsewhere in southern Colorado. The name "Minturn" was first applied to strata of Middle Pennsylvanian age near the town of Minturn in central Colorado (Tweto, 1949...
Seismicity map of the State of Montana Seismicity map of the State of Montana
This map is one of a series of seismicity maps produced by the U. S. Geological Survey that show earthquake data of individual states or groups of states at the scale of 1:1,000,000. This map shows only those earthquakes with epicenters located within the boundaries of Montana, even though earthquakes in bordering states or countries may have been felt or may have caused damage in...
Seismicity map of the State of Wyoming Seismicity map of the State of Wyoming
The data shown on this map and listed in table 1 are for earthquakes that were originally included in a study of seismic risk in the United States (Algermissen, 1969). This data file has been recompiled and updated through 1981. Some revisions of epicenters and intensities in the original file have been made, and intensities have been assigned to earthquakes that previously had none...
Seismotectonic map of the Puget Sound region, Washington Seismotectonic map of the Puget Sound region, Washington
The Puget Sound region is a seismically active area with hundreds of earthquakes occurring each year (Crosson, 1974, 1975, Crosson and Millard, 1975, Crosson and Noson, 1978a, 1978b, 1979). Most of the earthquakes are so small that they can be detected only by sensitive seismographs such as those operated by the University of Washington. Not all of the earthquakes have been small...
Stratigraphic cross section and coal bed correlations of uppermost Cretaceous and Paleocene rocks between Painted Canyon and Davis Buttes, North Dakota Stratigraphic cross section and coal bed correlations of uppermost Cretaceous and Paleocene rocks between Painted Canyon and Davis Buttes, North Dakota
Recent detailed coal studies in the area between Havelock and Fryburg, N. Dak. (Hinds, 1983; 1985), have resulted in some revised coal-bed correlations that are, in places, in disagreement with previous work (Banet, 1980; Hares, 1928; Lewis, 1979; Menge, 1977; Owen, 1979; Rehbein, 1977; Royse, 1967). The strati graphically most important of these have been specifically discussed (Hinds...
Stratigraphic cross sections and correlation of lignites in the Sentinel Butte member and upper part of the Tongue River member of the Fort Union Formation between Amidon and Fryburg, North Dakota Stratigraphic cross sections and correlation of lignites in the Sentinel Butte member and upper part of the Tongue River member of the Fort Union Formation between Amidon and Fryburg, North Dakota
The Austin Farm bed was once mined form an adit in the SE1/4 sec, T. 136 N., R. 101 W. Its westerly outcrop extends from that point northward along the east side and north end of the valley of Third Creek at elevations between about 2740 and 2800 ft. It is the uppermost lignite bed preserved on Hanley and Cliffs Plateaus in T. 137 N., R. 101 W., where its thickness is generally from 2 to...