Digital geologic map and database of the Frederick 30 X 60 minute quadrangle, Maryland, Virginia, and West Virginia

Online link https://geo-nsdi.er.usgs.gov/metadata/open-file/02-437/metadata.faq.html
Description The geology of the Frederick 30 by 60 minute quadrangle, Maryland, Virginia, and West Virginia, was mapped on 1:24,000-scale base maps from 1989 to 1994. The geologic data were manually compiled at 1:100,000-scale in 1997 and were digitized and converted
Originators Southworth, C. Scott; Brezinski, David K.; Drake, Avery Ala, Jr.; Burton, William C.; Orndorff, Randall C.; Froelich, Albert J.; Daniels, David L.; Reddy, James E.; and Denenny, Danielle
Publication U.S. Geological Survey Open-File Report 02-437

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States or counties

Landslide

Polygon delineating the planimetric area of a landslide found in coverages whose names begin with ls, ols, or yls

Label Definition
LS Some regions within landslides were apparently unaffected by the landslide (that is, they represent areas bypassed by the landslide but are within its outer boundaries) This attribute is used to distinguish those areas from the landslide itself.

Mapped area

Polygon in the mm coverages, used to indicate the method by which landslides were identified, found in coverages whose names begin with mm.

Label Definition
MM Mapping method