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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
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.
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Status of important prey fishes in the U.S. waters of Lake Ontario, 2013: Introduction and methods Status of important prey fishes in the U.S. waters of Lake Ontario, 2013: Introduction and methods
Lake Ontario has a mean depth of 86 m (282 ft) and a maximum depth of 244 m (801 ft) (Herdendorf 1982). The southern, New York portion of the lake has the deepest water (Figure 1). In New York waters, about 67% of the lake is
Authors
Maureen Walsh, Brian Weidel, Michael J. Connerton
Status of whitebarkpine in the Greater Yellowstone Ecosystem: A step-trend analysis comparing 2004-2007 to 2008-2011 Status of whitebarkpine in the Greater Yellowstone Ecosystem: A step-trend analysis comparing 2004-2007 to 2008-2011
Whitebark pine (Pinus albicaulis) is a foundation and keystone species in upper subalpine environments of the northern Rocky Mountains that strongly influences the biodiversity and productivity of high-elevation ecosystems (Tomback et al. 2001, Ellison et al. 2005). Throughout its historic range, whitebark pine has decreased significantly as a major component of high-elevation forests...
Authors
Erin Shanahan, Kathryn M. Irvine, Dave Roberts, Andrea R. Litt, Kristin Legg, Rob Daley, Nina Chambers
Strategic conservation planning for the Eastern North Carolina/Southeastern Virginia Strategic Habitat Conservation Team Strategic conservation planning for the Eastern North Carolina/Southeastern Virginia Strategic Habitat Conservation Team
The Eastern North Carolina/Southeastern Virginia Strategic Habitat Conservation Team (ENCSEVA) is a partnership among local federal agencies and programs with a mission to apply Strategic Habitat Conservation to accomplish priority landscape-level conservation within its geographic region. ENCSEVA seeks to further landscape-scale conservation through collaboration with local partners. To
Authors
Louise B. Alexander-Vaughn, Jaime A. Collazo, C. Ashton Drew
Stratigraphic framework and depositional sequences in the Lower Silurian regional oil and gas accumulation, Appalachian basin from Jackson County, Ohio, through northwestern Pennsylvania, to Orleans County, New York Stratigraphic framework and depositional sequences in the Lower Silurian regional oil and gas accumulation, Appalachian basin from Jackson County, Ohio, through northwestern Pennsylvania, to Orleans County, New York
This chapter is a re-release of U.S. Geological Survey Scientific Investigations Map 2916, of the same title, by Ryder (2006).
Authors
Robert T. Ryder
Stratigraphic framework and depositional sequences in the Lower Silurian regional oil and gas accumulation, Appalachian basin: from Ashland County, Ohio, through southwestern Pennsylvania, to Preston County, West Virginia Stratigraphic framework and depositional sequences in the Lower Silurian regional oil and gas accumulation, Appalachian basin: from Ashland County, Ohio, through southwestern Pennsylvania, to Preston County, West Virginia
This chapter is a re-release of U.S. Geological Survey Geologic Investigations Series Map I–2810, of the same title, by Ryder (2004).
Authors
Robert T. Ryder
Stratigraphic framework and depositional sequences in the Lower Silurian regional oil and gas accumulation, Appalachian basin: from Licking County, Ohio, to Fayette County, West Virginia Stratigraphic framework and depositional sequences in the Lower Silurian regional oil and gas accumulation, Appalachian basin: from Licking County, Ohio, to Fayette County, West Virginia
This chapter is a re-release of U.S. Geological Survey Scientific Investigations Map 2916, of the same title, by Ryder (2006).
Authors
Robert T. Ryder
Stratigraphic framework of Cambrian and Ordovician rocks in the Appalachian basin from Sequatchie County, Tennessee, through eastern Kentucky, to Mingo County, West Virginia Stratigraphic framework of Cambrian and Ordovician rocks in the Appalachian basin from Sequatchie County, Tennessee, through eastern Kentucky, to Mingo County, West Virginia
This chapter is a re-release of U.S. Geological Survey Scientific Investigations Map 2994, of the same title, by Ryder and others (2008).
Authors
Robert T. Ryder, Robert D. Crangle, John E. Repetski, Anita G. Harris
Stratigraphic framework of Cambrian and Ordovician rocks in the central Appalachian basin from Campbell County, Kentucky, to Tazewell County, Virginia Stratigraphic framework of Cambrian and Ordovician rocks in the central Appalachian basin from Campbell County, Kentucky, to Tazewell County, Virginia
This chapter is a re-release of U.S. Geological Survey Miscellaneous Investigations Series Map I-2530, of the same title, by Ryder and others (1997; online version 2.0 revised and digitized by Erika E. Lentz, 2004). Version 2.0 is a digital version of the original and also includes the gamma-ray well log traces.
Authors
Robert T. Ryder, John E. Repetski, Anita G. Harris, Erika E. Lentz
Stratigraphic framework of cambrian and ordovician rocks in the central Appalachian basin from Lake County, Ohio, to Juniata County, Pennsylvania Stratigraphic framework of cambrian and ordovician rocks in the central Appalachian basin from Lake County, Ohio, to Juniata County, Pennsylvania
This chapter is a re-release of U.S. Geological Survey Miscellaneous Investigations Series Map I-2200, of the same title, by Ryder (1992; online version 1.0 revised and digitized by Robert D. Crangle, Jr., 2002). Version 1.0 is a digital verson of the original and also includes the gamma-ray well log traces.
Authors
Robert T. Ryder, Robert D. Crangle
Stratigraphic framework of Cambrian and Ordovician rocks in the central Appalachian basin from Medina County, Ohio, through southwestern and south-central Pennsylvania to Hampshire County, West Virginia Stratigraphic framework of Cambrian and Ordovician rocks in the central Appalachian basin from Medina County, Ohio, through southwestern and south-central Pennsylvania to Hampshire County, West Virginia
This chapter is a re-release of U.S. Geological Survey Bulletin 1839-K, of the same title, by Ryder and others (1992; online version 2.0 revised and digitized by Robert D. Crangle, Jr., 2003). It consists of one file of the report text as it appeared in USGS Bulletin 1839-K and a second file containing the cross section, figures 1 and 2, and tables 1 and 2 on one oversized sheet; the...
Authors
Robert T. Ryder, Anita G. Harris, John E. Repetski, Robert D. Crangle
Stratigraphic framework of Cambrian and Ordovician rocks in the central Appalachian basin from Richland County, Ohio, to Rockingham County, Virginia Stratigraphic framework of Cambrian and Ordovician rocks in the central Appalachian basin from Richland County, Ohio, to Rockingham County, Virginia
This chapter is a re-release of U.S. Geological Survey Miscellaneous Investigations Series Map I-2264, of the same title, by Ryder (1991; online version 1.0 revised and digitized by Robert D. Crangle, Jr., 2003). Version 1.0 is a digital version of the original and also includes the gamma-ray well log traces.
Authors
Robert T. Ryder, Robert D. Crangle
Summary of preliminary step-trend analysis from the Interagency Whitebark Pine Long-termMonitoring Program—2004-2013 Summary of preliminary step-trend analysis from the Interagency Whitebark Pine Long-termMonitoring Program—2004-2013
In mixed and dominant stands, whitebark pine (Pinus albicaulis) occurs in over two million acres within the six national forests and two national parks that comprise the Greater Yellowstone Ecosystem (GYE). Currently, whitebark pine, an ecologically important species, is impacted by multiple ecological disturbances; white pine blister rust (Cronartium ribicola), mountain pine beetle...
Authors
Kristin Legg, Erin Shanahan, Rob Daley, Kathryn M. Irvine