Publications
Filter Total Items: 832
Digital geologic map of the Harpers Ferry National Historical Park
No abstract available.
Authors
Scott Southworth, D. K. Brezinski, Randall C. Orndorff, Kerry M. Lagueux, Peter G. Chirico
Isotopic ages from intrusive rocks near the Stuyahok gold placer deposits, south-central Holy Cross quadrangle, Alaska: A section in Geologic studies in Alaska by the U.S. Geological Survey, 1998
In the Stuyahok area of the south-central Holy Cross quadrangle, Alaska, felsic to intermediate dikes and sills intrude Lower Cretaceous volcanic and volcaniclastic rocks of the Koyukuk terrane. These previously undated intrusions are the probable source of at least 933 kg (30,000 oz) of past placer gold production. Additional placer, and perhaps lode, resources are likely present at Stuyahok. New
Authors
Marti L. Miller, Robert D. Tucker, Paul W. Layer, Thomas K. Bundtzen
Preliminary stratigraphic database for the subsurface Tertiary and uppermost Cretaceous sediments of Dorchester County, South Carolina
No abstract available.
Authors
Gregory Gohn, Laurel M. Bybell, Peter G. Chirico, R. A. Christopher, Lucy E. Edwards, N. O. Frederiksen, D. C. Prowell, Jean Self-Trail, Robert E. Weems
Neogene calcareous nannofossil biostratigraphy of the Caribbean coast of Panama and Costa Rica
No abstract available.
Authors
Laurel M. Bybell
The Central Great Lakes Geologic Mapping Coalition
The State Geological Surveys of Illinois, Indiana, Michigan, and Ohio joined with the U.S. Geological Survey (USGS, under the Earth Surface Dynamics Program) to form the Central Great Lakes Geologic Mapping Coalition. These four States have a similar geologic heritage and need to address common societal issues about land and water resources, the environment, and geologic hazards. By pooling their
Authors
Sustainable growth in America's heartland: 3-D geologic maps as the foundation
The Central Great Lakes States of Illinois, Indiana, Michigan, and Ohio constitute one of the most productive and economically important regions in the country—America’s heartland. The agriculture, industry, business, recreation, and ecology of these States are based on a common geologic heritage. During the last 1.8 million years, glaciers repeatedly advanced and retreated across the region, leav
Authors
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Historical trends in salinity and substrate in central and northern Florida Bay: A Paleoecological Reconstruction using modern analogue data
Understanding the natural spatial and temporal variability that exists within an ecosystem is a critical component of efforts to restore systems to their natural state. Analysis of benthic foraminifers and molluscs from modern monitoring sites within Florida Bay allows us to determine what environmental parameters control spatial and temporal variability of their assemblages. Faunal assemblages as
Authors
G. Lynn Wingard, Scott E. Ishman
Neoproterozoic(?) to Pennsylvanian inner-shelf, miogeoclinal strata in Sierra Agua Verde, Sonora, Mexico
No abstract available.
Authors
John H. Stewart, Forrest G. Poole, Anita G. Harris, John E. Repetski, Bruce R. Wardlaw, Bernard L. Mamet, J. M. Morales-Ramirez
Application of aerial gamma-ray spectrometric and magnetic surveys in geologic mapping: a case study in southern Virginia and northern North Carolina
Aerial gamma-ray spectrometric and magnetic survey maps are valuable aids for geologic
mapping where rocks are poorly exposed in south-central Virginia and northernmost North Carolina.
Broad low areas on the potassium and thorium gamma-ray survey maps distinguish the Carolina,
Spring Hope, and Roanoke Rapids terranes from more highly radiogenic areas of the Raleigh and
Triplet terranes, reflecting
Authors
J. Wright Horton, David L. Daniels
Lithostratigraphy, geophysics, biostratigraphy, and strontium-isotope stratigraphy of the surficial aquifer system of eastern Collier County and northern Monroe County, Florida
In 1997, ten cores were drilled in eastern Collier County and northern Monroe County, within the limits of the Big Cypress National Preserve. These cores represent a continuation of the study of seven cores in western Collier County begun in 1996 and reported in Weedman and others (1997) and Edwards and others (1998). This joint U.S. Geological Survey and Florida Geological Survey project is desig
Authors
S.D. Weedman, Frederick L. Paillet, Lucy E. Edwards, K. R. Simmons, T.M. Scott, B. R. Wardlaw, R.S. Reese, J.L. Blair
Inventory of debris flows and floods in the Lovingston and Horseshoe Mountain, VA, 7.5' quadrangles from the August 19/20, 1969, storm in Nelson County, Virginia
No abstract available.
Authors
B. A. Morgan, Giulio Iovine, Peter G. Chirico, G. F. Wieczorek
Mapping the glacial geology of the Central Great Lakes region in three dimensions: A model for state-federal cooperation
Planners need to evaluate complex and competing public-policy options for managing water, land, and biological resources; they must ensure economic growth, meet the needs of an increasing population, assess hazards, and manage the environment in a sustainable manner. The State Geological Surveys of Illinois, Indiana, Michigan, and Ohio and the U.S. Geological Survey (USGS) receive many requests fr
Authors
Richard C. Berg, Ned K. Bleuer, Berwyn E. Jones, Kevin A. Kincare, Richard R. Pavey, Byron D. Stone