Fifty-three types of surficial geologic deposits and residual materials of Quaternary age are described in a pamphlet and located on a map of the greater Pueblo area, in part of the Front Range, in the Wet and Sangre de Cristo Mountains, and on the plains east of Colorado Springs and Pueblo. Deposits formed by landslides, wind, and glaciers, as well as colluvium, residuum, alluvium, and others are described in terms of predominant grain size, mineral or rock composition (e.g., gypsiferous, calcareous, granitic, andesitic), thickness, and other physical characteristics. Origins and ages of the deposits and geologic hazards related to them are noted. Many lines drawn between units on our map were placed by generalizing contacts on published maps. However, in 1997-1999 we mapped new boundaries as well. The map was projected to the UTM projection. This large map area extends from near Salida (on the west edge), eastward about 107 mi (172 km), and from Antero Reservoir and Woodland Park on the north edge to near Colorado City at the south edge (68 mi; 109 km).
This digital map database is compiled from unpublished data and new mapping by the authors, represents the general distribution of surficial and bedrock geology in the mapped area. Together with the accompanying pamphlet, it provides current information on the geologic structure and stratigraphy of the area. The database dilineate map units thatare identified by age and lithology following the stratigraphic nomenclature of the U.S. Geological Survey. The scale of the source maps limits the spatial resolution of the database to 1:31,680 or smaller.
A bathymetric map of the Republic of the Marshall Islands and vicinity in the window latitude 3 to 17 degrees North, longitude 153 to 175 degrees East was compiled from surveys conducted by the U.S. Geological Survey (USGS), Korean Ocean Research and Development Institute (KORDI), and published gridded data. National jurisdictions and island and atoll coastlines are indicated. This bathymetric map of the Republic of the Marshall Islands was constructed from (1) unpublished data collected during recent surveys conducted by the USGS and KORDI (J.W. Moon and K.Y. Lee; Hein and others, in press), (2) the two-minute gridded satellite altimetry data from Smith and Sandwell (1997), and (3) coastline data from the Generic Mapping Tools (GMT) software (Wessel and Smith, 1995) and Chase and others (1984). The spellings of island, atoll, and seamount names follow the recommendation of the Republic of the Marshall Islands government and are consistent with those in the Marshallese-English dictionary, including the diacritical marks (Abo and others, 1976). We were provided a list of names for the seamounts by Alfred Capelle (Alele Museum and National Archives, now located at the College of the Marshall Islands), who solicited those traditional names from village leaders from the various islands. We applied the appropriate names to seamounts located within specifically defined sectors adjacent to the various atolls and islands. The names are primarily from Marshallese legends and the meaning of each is provided by Hein and others (1990).
This report is an analysis of regional gravity and aeromagnetic data that was carried out as part of a Conterminuous United States Mineral Assessment Program (CUSMAP) study of the Joplin 1° X 2° quadrangle, Kansas and Missouri. It is one in a series of reports representing a cooperative effort between the U.S. Geological Survey, Kansas Geological Survey, and Missouri Department of Natural Resources, Division of Geology and Land Survey. The work presented here is part of a larger project whose goal is to assess the mineral resource potential of the Paleozoic sedimentary section and crystalline basement within the quadrangle. Reports discussing geochemical, geological, and various other aspects of the study area are included in this Miscellaneous Field Studies Map series as MF-2125-A through MF-2125-E. Geophysical interpretation of Precambrian crystalline basement lithology and structure is the focus of this report. The study of the crystalline basement is complicated by the lack of exposures due to the presence of a thick sequence of Phanerozoic sedimentary cover. In areas where there are no outcrops, the geologist must turn to other indirect methods to assist in an understanding of the basement. Previous investigations of the buried basement in this region used available drill hole data, isotope age information, and regional geophysical data (Sims, 1990; Denison and others, 1984; Bickford and others, 1986). These studies were regional in scope and were presented at state and multistate scales. The work documented here used recently collected detailed gravity and aeromagnetic data to enhance the regional geologic knowledge of the area. Terrace-density and terrace-magnetization maps were calculated from the gravity and aeromagnetic data, leading directly to inferred physical-property (density and magnetization) maps. Once these maps were produced, the known geology and drill-hole data were reconciled with the physical-property maps to form a refined structural and lithologic map of the crystalline basement.
This map shows the geochemical favorability for mesothermal base- and precious-metal veins in the Wallace 1° by 2° quadrangle, Montana and Idaho. The information presented here is part of the Wallace CUSMAP (Conterminous United States Mineral Assessment Program) project conducted by the U.S. Geological Survey.
This map is part of a folio of maps of the Springfield 1° x 2° quadrangle, Missouri, prepared under the Conterminous United States Mineral Assessment Program. Other publications in this folio to data include U.S. Geological Survey Miscellaneous Field Studies Maps MF-1830-A and B and Missouri Geological Survey Open-file Report OFR-85-42-MR. Additional maps showing various geologic aspects of the Springfield quadrangle will be published as U.S. Geological Survey Miscellaneous Field Studies Maps bearing this same serial number with different letter suffixes (MF-1830-D, E).
Survey and the U.S. Bureau of Mines have been conducting mineral surveys of wilderness and primitive areas.Areas officially designated as "wilderness", "wild", or "canoe" when the act was passed were incorporated into the National Wilderness Preservation System, and some of them are presently being studied.The act provided that areas under consideration for wilderness designation should be studied for suitability for incorporation into the Wilderness System.The mineral surveys constitute one aspect of the suitability studies.The act directs that the results of such surveys are to be made available to the public and be submitted to the President and the Congress.This report discusses the results of a mineral survey of the Hoover Wilderness and
