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    Geology of Loudoun County

    Metadata Updated: November 15, 2025

    The geology of Loudoun County, Virginia, was mapped in 1988 through 1991 under a cooperative agreement between the U.S. Geological Survey (USGS) and the Loudoun County Department of Environmental Resources.This geologic map was compiled in 1993 from a series of detailed published and unpublished field investigations at scales of 1:12,000 and 1:24,000. Some of these same datawere compiled as a digital geologic map at 1:100,000 scale (Burton and others, 1992a) and were the basis for a cost-benefit analysis of the societal value of geologic maps (Bernknopf and others, 1993).

    The data was later revised and published by USGS in the Open File Report, MAP OF-99-150, GEOLOGIC MAP OF LOUDOUN COUNTY, VIRGINIA By Scott Southworth, W.C. Burton, J.S. Schindler, and A.J. Froelich1 with contributions on the geology of the Piedmont province by A.A. Drake, Jr., and R.E. Weems and an aeromagnetic survey by D.L. Daniels, W.F. Hanna, and R.E. Bracken.
    Data current as of April 2018

    Access & Use Information

    Public: This dataset is intended for public access and use. Non-Federal: This dataset is covered by different Terms of Use than Data.gov. License: See this page for license information.

    Downloads & Resources

    Dates

    Metadata Created Date September 2, 2022
    Metadata Updated Date November 15, 2025

    Metadata Source

    Harvested from Loudoun County Virginia Data Source

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date September 2, 2022
    Metadata Updated Date November 15, 2025
    Publisher Loudoun County GIS
    Maintainer
    Identifier https://www.arcgis.com/home/item.html?id=c4e0219017c14b70ab55192b847ae350
    Data First Published 2018-05-08T12:28:45.000Z
    Data Last Modified 2025-11-13T23:04:06.000Z
    Category geospatial
    Public Access Level public
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Harvest Object Id 563ff4bd-6a16-4913-8a0b-2b7ac184b87e
    Harvest Source Id bc39e510-cff7-4263-8d5b-7c800dd08cd6
    Harvest Source Title Loudoun County Virginia Data Source
    Homepage URL https://geohub-loudoungis.opendata.arcgis.com/apps/LoudounGIS::geology-of-loudoun-county
    License https://logis.loudoun.gov/loudoun/disclaimer.html
    Metadata Type geospatial
    Old Spatial {{extent:computeSpatialProperty}}
    Source Datajson Identifier True
    Source Hash b2b3d7906bf546b0e35fd4bfe4194134ebc464711072585194abfd5e37013ac2
    Source Schema Version 1.1
    Spatial

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