ArcGIS REST Services Directory
JSON

Layer: Geologic Map of Frederick and Washington Counties, Maryland (ID:90)

View In:   Map Viewer

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 &quot;border faults&quot;. 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

Min. Scale: 0

Max. Scale: 0

Default Visibility: true

Max Record Count: 2000

Supported query Formats: JSON, geoJSON, PBF

Use Standardized Queries: True

Extent:

Drawing Info:

HasZ: false

HasM: false

Has Attachments: false

Has Geometry Properties: true

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Object ID Field: FID

Unique ID Field:

Global ID Field:

Type ID Field: Symbol

Fields:
Types:

Is Data Versioned: false

Has Contingent Values: false

Supports Rollback On Failure Parameter: true

Last Edit Date: 6/24/2025 12:25:00 PM

Schema Last Edit Date: 6/24/2025 12:25:00 PM

Data Last Edit Date: 6/20/2025 4:22:23 PM

Supported Operations:   Query   Query Pivot   Query Top Features   Query Analytic   Query Bins   Generate Renderer   Validate SQL   Get Estimates   ConvertFormat