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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 5,500 book chapters 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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THE SKIN | Functional morphology of the integumentary system in fishes THE SKIN | Functional morphology of the integumentary system in fishes
The integument that covers the outer surface of a fish’s body and fins is a multifunctional organ, with morphological features highly adapted to carry out these functions. The integument consists of two layers. The outer layer, the epidermis, is essentially cellular in structure, comprised of a multilayered epithelium that usually includes specialized cells. The inner layer, the dermis...
Authors
D.G. Elliott
Topographic mapping data semantics through data conversion and enhancement Topographic mapping data semantics through data conversion and enhancement
This paper presents research on the semantics of topographic data for triples and ontologies to blend the capabilities of the Semantic Web and The National Map of the U.S. Geological Survey. Automated conversion of relational topographic data of several geographic sample areas to the triple data model standard resulted in relatively poor semantic associations. Further research employed
Authors
Dalia Varanka, Jonathan Carter, E. Lynn Usery, Thomas Shoberg
U.S. Geological Survey: A synopsis of Three-dimensional Modeling U.S. Geological Survey: A synopsis of Three-dimensional Modeling
The U.S. Geological Survey (USGS) is a multidisciplinary agency that provides assessments of natural resources (geological, hydrological, biological), the disturbances that affect those resources, and the disturbances that affect the built environment, natural landscapes, and human society. Until now, USGS map products have been generated and distributed primarily as 2-D maps...
Authors
Linda J. Jacobsen, Pierre D. Glynn, Geoff A. Phelps, Randall C. Orndorff, Gerald W. Bawden, V. J. S. Grauch
Upper Cretaceous bituminous coal deposits of the Olmos Formation, Maverick County, Texas Upper Cretaceous bituminous coal deposits of the Olmos Formation, Maverick County, Texas
This report describes the bituminous coal deposits of the Olmos Formation (Navarro Group, Upper Cretaceous; Figures 1, 2) of Maverick County in south Texas. Although these were not evaluated quantitatively as part of the current Gulf Coastal Plain coal-resource assessment, a detailed review is presented in this chapter. Prior to the late 1920s, these coal beds were mined underground on a...
Authors
Robert W. Hook, Peter D. Warwick, John R. SanFilipo
Use of stable isotopes and mercury to assess trophic positions of black carp and other large fishes in the Red-Atchafalaya River system, Louisiana, USA Use of stable isotopes and mercury to assess trophic positions of black carp and other large fishes in the Red-Atchafalaya River system, Louisiana, USA
No abstract available.
Authors
L. Nico, A. Demopoulos, D. Gualtieri, C. Wieser
Use of visible geostationary operational meteorological satellite imagery in mapping reference and potential evapotranspiration over Florida Use of visible geostationary operational meteorological satellite imagery in mapping reference and potential evapotranspiration over Florida
No abstract available.
Authors
John R. Mecikalski, David Summers, Jennifer M. Jacobs, Chandra S. Pathak, Simon J. Paech, Ellen M. Douglas
Verification of ploidy and reproductive potential in triploid black carp and grass carp Verification of ploidy and reproductive potential in triploid black carp and grass carp
No abstract available
Authors
Diana M. Papoulias, James S. Candrl, Jill A. Jenkins, Donald E. Tillitt
Walleye and sauger habitat Walleye and sauger habitat
No abstract available.
Authors
Michael A. Bozek, Timothy J. Haxton, Joshua K. Raabe
Wilcox group (Paleocene to Eocene) coals of the Sabine Uplift area, Texas and Louisiana Wilcox group (Paleocene to Eocene) coals of the Sabine Uplift area, Texas and Louisiana
The Wilcox Group (Paleocene to Eocene) of the Sabine uplift, a structural arch in northeastern Texas and northwestern Louisiana (Figure 1), has lignite zones that approach subbituminous rank (see Chapter 4, this publication). These coals are among the highest quality resources known within the Gulf Coastal Plain because of their low ash yield and sulfur content. The surface expression of...
Authors
Robert W. Hook, Peter D. Warwick, John R. SanFilipo
Mapping the onset and progression of marsh dieback Mapping the onset and progression of marsh dieback
Along the Gulf of Mexico (GOM) coasts, vast wetlands inject valuable nutrients and suspended and dissolved materials into the coastal ocean. Juncus roemerianus (black needlerush) wetlands, dominating coastlines in the northeastern GOM, transition to the Spartina alternifl ora (smooth cordgrass) coastline of Louisiana. Mixed marsh and mangrove barrier island systems occupy the...
Authors
Elijah Ramsey III, Amina Rangoonwala
Inside the crater, outside the crater: Stratigraphic details of the margin of the Chesapeake Bay impact structure, Virginia, USA Inside the crater, outside the crater: Stratigraphic details of the margin of the Chesapeake Bay impact structure, Virginia, USA
Two cores at the outer margin of the Chesapeake Bay impact structure show significant structural and depositional variations that illuminate its history. Detailed stratigraphy of the Watkins School core reveals that this site is outside the disruption boundary of the crater with respect to its lower part (nonmarine Cretaceous Potomac Formation), but just inside the boundary with respect...
Authors
Lucy E. Edwards, David S. Powars, J. Wright Horton,, Gregory Gohn, Jean Self-Trail, R. J. Litwin