Name: Atlantic Seaboard Fall Line approximate location
Display Field: LEFT_FID
Type: Feature Layer
Geometry Type: esriGeometryPolyline
Description: <span style="font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;">This layer displays the approximate location of the Atlantic Seaboard Fall Line, or fall zone, located along the boundary between the Piedmont and Coastal Plain physiographic regions. The approximate location of the fall line is highlighted in blue.</span>
Copyright Text: M. Amelia Raines, Reference Librarian Library of Congress Geography and Map Division
Description: <div><font color="#333333" face="Helvetica Neue, Helvetica, Arial, sans-serif"><span style="font-size:14px;">The intent of defining Hydrologic Units (HU) within the Watershed Boundary Dataset is to establish a base-line drainage boundary framework, accounting for all land and surface areas. Hydrologic units are intended to be used as a tool for water-resource management and planning activities particularly for site-specific and localized studies requiring a level of detail provided by large-scale map information. The WBD complements the National Hydrography Dataset (NHD) and supports numerous programmatic missions and activities including: watershed management, rehabilitation and enhancement, aquatic species conservation strategies, flood plain management and flood prevention, water-quality initiatives and programs, dam safety programs, fire assessment and management, resource inventory and assessment, water data analysis and water census.</span></font></div><div><font color="#333333" face="Helvetica Neue, Helvetica, Arial, sans-serif"><span style="font-size:14px;">This layer was created by combining USGS Watershed Boundary Dataset (WBD) for 2-digit Hydrologic Unit - 02 (published 20250108) and USGS Watershed Boundary Dataset (WBD) for 2-digit Hydrologic Unit - 05 (published 20250108). Original data can be found at https://www.sciencebase.gov/catalog/item/5a1632b3e4b09fc93dd171de and https://www.sciencebase.gov/catalog/item/5a1632b4e4b09fc93dd171ea. </span></font></div>
Copyright Text: U.S. Geological Survey (USGS), 20250108, USGS Watershed Boundary Dataset (WBD) for 2-digit Hydrologic Unit - 05 (published 20250108) Shapefile: U.S. Geological Survey (USGS); U.S. Geological Survey (USGS), 20250108, USGS Watershed Boundary Dataset (WBD) for 2-digit Hydrologic Unit - 02 (published 20250108) Shapefile: U.S. Geological Survey (USGS).
Description: The intent of defining Hydrologic Units (HU) within the Watershed Boundary Dataset is to establish a base-line drainage boundary framework, accounting for all land and surface areas. Hydrologic units are intended to be used as a tool for water-resource management and planning activities particularly for site-specific and localized studies requiring a level of detail provided by large-scale map information. The WBD complements the National Hydrography Dataset (NHD) and supports numerous programmatic missions and activities including: watershed management, rehabilitation and enhancement, aquatic species conservation strategies, flood plain management and flood prevention, water-quality initiatives and programs, dam safety programs, fire assessment and management, resource inventory and assessment, water data analysis and water census. <div>This dataset was created by combining USGS Watershed Boundary Dataset (WBD) for 2-digit Hydrologic Unit - 02 and USGS Watershed Boundary Dataset (WBD) for 2-digit Hydrologic Unit - 05. Original data can be found at https://www.sciencebase.gov/catalog/item/5a1632b3e4b09fc93dd171de and https://www.sciencebase.gov/catalog/item/5a1632b4e4b09fc93dd171ea. </div>
Copyright Text: U.S. Geological Survey (USGS), 20250108, USGS Watershed Boundary Dataset (WBD) for 2-digit Hydrologic Unit - 02 (published 20250108) Shapefile: U.S. Geological Survey (USGS). ;
U.S. Geological Survey (USGS), 20250108, USGS Watershed Boundary Dataset (WBD) for 2-digit Hydrologic Unit - 05 (published 20250108) Shapefile: U.S. Geological Survey (USGS).
Description: Per USGS Open-File Report 2000-424, generalized lithology (rock type) and physiography based on geologic formations were used to characterize hydrogeomorphic regions (HGMR) within the Chesapeake Bay watershed. These HGMRs were used in conjunction with existing data to assess the significance of ground-water discharge as a source of nitrate load to nontidal streams in the Chesapeake Bay watershed (Bachman and others, 1998). This work is part of the U.S. Geological Survey's (USGS) Chesapeake Bay initiative to develop an understanding and provide scientific information for the restoration of the Chesapeake Bay and its watershed (Phillips and Caughron, 1997).
Name: Geologic Map of Frederick and Washington Counties, Maryland
Display Field: MapUnit
Type: Feature Layer
Geometry Type: esriGeometryPolygon
Description: <div style="text-align:Left;"><p>This file contains data concerning the location and characteristics of bedrock, mappable geologic units, within Frederick and Washington counties. Data from several geologic quadrangles and two regional scale geologic maps were incorporated into the regional scale geologic feature classes in this geodatabase. Because of the scale of this map, some features were generalized slightly from the quad scale data. Additionally, some corrections were made for accuracy, such as edge matching to resolve "border faults". The source data for this map and geodatabase come from maps published by the Maryland Geological Survey from 2001 to the present, as well as one map published in cooperation with the United States Geological Survey. The source maps are Buckeystown (2001), Catoctin Furnace (2004), Frederick (2004), New Windsor (2004), Point of Rocks (2004), Walkersville (2004), Woodsboro (2004), Middletown (2005), Union Bridge (2006), Funkstown (2009), Keedysville, Shepherdstown, Charlestown, and Harpers Ferry (2009), Myersville and Smithsburg (2009), Hagerstown (2013), Mason and Dixon (2013), Clear Spring and Hedgesville (2014), Williamsport (2014), Blue Ridge Summit (2021, in review), Emmitsburg and Taneytown (2021, in review), all 1:24000 quadrangle scale, as well as portions of two regional maps: Geologic Map of Garrett, Allegany, and Western Washington Counties, Maryland (2013), and Geologic Map of the Frederick 30' x 60' Quadrangle, Maryland, Virginia, and West Virginia (USGS, 2007). The GIS data from the referenced maps were mosaiced in Arc Map, corrected for accuracy across quad boundaries, merged to form a continuous dataset and clipped to the extent of the two counties in Maryland: Washington and Frederick. Feature level metadata are included, which contain field descriptions for each feature class. This is a small scale dataset, appropriate for 1:100,000 regional scale. Quad scale data are suggested for display or analysis that requires a larger scale. This dataset is prepared for compliance with the USGS GeMS database standard.</p></div>
Copyright Text: Brezinski, D.K., Kavage Adams, R., and Connallon, C.B., 2021, Geologic Map of Frederick and Washington Counties, Maryland: Maryland Geological Survey, Geologic Map, scale 1:100000.
These data represent the results of data collection/processing for a specific Department of Natural Resources, Maryland Geological Survey activity and indicate general existing conditions. As such, they are only valid for the intended use, content, time, and accuracy specification. The user is responsible for the results of any application of the data for other than their intended purpose. The Department of Natural Resources, Maryland Geological Survey makes no warranty, expressed or implied, as to the use or appropriateness of the data, and there are no warranties of merchantability or fitness for a particular purpose of use. The Maryland Geological Survey makes no representation to the accuracy or completeness of the data and may not be held liable for human error or defect. Data are only valid at 1:100,000 scale. Data should not be used at a scale greater than that. By using the data, you signify that you have read the use constraints and accept its terms. Acknowledgement of the Maryland Geological Survey and credit to the originator(s)/author(s) are expected in products derived from this data
Name: Geologic Map of Garrett, Allegany and Western Washington Counties in Maryland
Display Field: MapUnitAbb
Type: Feature Layer
Geometry Type: esriGeometryPolygon
Description: <div style="font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;">The "Geological Map of Garrett, Allegany and western Washington Counties in Maryland" is the first comprehensive geologic map of the region published in more than 50 years. This map covers the westernmost counties of the State, providing a current look at how bedrock units and major surface deposits are distributed. The map was developed by David K. Brezinski and Robert D. Conkwright, Jr.</div><div style="font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;"><br /></div><div style="font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;">As residential, commercial and recreational development increases in the western portion of the State, and with the potential for the Marcellus Shale to serve as a natural gas resource, the updated map will provide necessary information on the geologic factors that affect and guide decisions about the wise use of the landscape and natural resources.</div><div style="font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;"><br /></div><div style="font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;">This map includes short descriptions of geologic units and a cross section showing the distribution of geologic units under the earth’s surface. Among other uses, the map will provide users with a better understanding of the distribution, depths and thickness of Marcellus Shale. This map will be especially useful in showing the interplay between geologic formations and groundwater availability and quality.</div><div style="font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;">https://www.mgs.md.gov/publications/map_pages/garrett_allegany_washington_geo_map.html</div>
Copyright Text: Brezinski, D.K. and Conkwright, R.D., 2013, Geologic Map of Garrett, Allegany and Western Washington Counties in Maryland: Maryland Geological Survey, Geologic Map, scale 1:100000.
Description: DATA is for educational use only - there are known errors and omissions. These data are only valid for the intended use. The user is responsible for the outcome of the data resulting from use of this product. Neither the licensor, nor the owner of these data makes any warranties of merchantability or fitness for a particular purpose of use. Disclaimer for Towson University, CGIS and for Martin F. Schmidt, Jr. ("GIS FILE ORIGINATORS"): THE LICENSEE EXPRESSLY ACKNOWLEDGES THAT THE DATA CONTAIN SOME NONCONFORMITIES, DEFECTS, OR ERRORS. GIS FILE ORIGINATORS DO NOT WARRANT THAT THE DATA WILL MEET LICENSEE'S NEEDS OR EXPECTATIONS; THAT THE USE OF THE DATA WILL BE UNINTERUPPTED; OR THAT ALL NONCONFORMITIES, DEFECTS, OR ERRORS CAN OR WILL BE CORRECTED. GIS FILE ORIGINATORS ARE NOT INVITING RELIANCE ON THIS DATA, AND THE LICENSEE SHOULD ALWAYS VERIFY ACTUAL DATA. THE DATA AND RELATED MATERIALS CONTAIN THEREIN ARE PROVIDED "AS-IS," WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR USE. Acknowledgement of Towson University Center for Geographic Information Sciences & Martin F. Schmidt, Jr., for the educational GIS file and credit to the original authors/compilers of the source map are expected in products derived from this data.This is a MD iMAP hosted service layer. Find more information at https://imap.maryland.gov.
Copyright Text: Acknowledgement of Towson University Center for Geographic Information Sciences & Martin F. Schmidt, Jr., for the educational GIS file and credit to the original authors/compilers of the source map are expected in products derived from this data.