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Mineral Resources On-Line Spatial Data

Wachapreague Formation

Wachapreague Formation - Coarsening-upward sequence from lower muddy fine-grained sand to upper medium- to coarse-grained gravelly sand, at altitudes from sea level to about 15 ft. (top of unit).
StateVirginia
NameWachapreague Formation
Geologic ageQuaternary
Original map labelQwa
CommentsCoastal Plain, East of Chesapeake Bay From expanded explanation (ref. VA002): Wachapreague Formation (upper Pleistocene, Mixon, 1985). Coarsening upward sequence, includes a lower member of clayey and silty, fine to very-fine, gray sand interbedded with clay-silt and an upper member of medium to coarse, gravelly sand. Mollusks, including Mesodesma arctatum and Siliqua costata, and ostracode assemblages dominated by Elofsonella concinna and Muellerina canadensis indicate cooling ocean temperatures during deposition of unit. Pollen assemblage dominated by pine, spruce, birch, and alder suggests cool- to cold-temperate conditions in nearby land areas. Unit is surficial deposit of narrow, arcuate coastal lowland ranging in altitiude from sea level, at eastern border with Holocene barrier-lagoon complex, to about 15 feet at toe of ocean-facing scarp forming western boundary. Thickness is 0 to 40 feet..
Primary rock typesand
Secondary rock type
Other rock types
Lithologic constituents
Major
Unconsolidated > Coarse-detrital > Sand
Map references
Digital Representation of the 1993 Geologic Map of Virginia", 2003, CD ROM (ISO-9660) contains image file, expanded explanation in pdf, and ESRI shapefiles, viewing software not included. This is a digital version of "Geologic Map of Virginia" published in 1993. Available from: https://www.dmme.virginia.gov/commerce/
Unit references
Virginia Division of Mineral Resources, 1993, Geologic Map of Virginia: Virginia Division of Mineral Resources, scale 1:500,000
Digital Representation of the 1993 Geologic Map of Virginia - expanded explanation: 2003, Commonwealth of Virginia, Department of Mines, Minerals, and Energy, Divsion of Mineral Resources, Publication 147, 85 pp
Digital Representation of the 1993 Geologic Map of Virginia", 2003, CD ROM (ISO-9660) contains image file, expanded explanation in pdf, and ESRI shapefiles, viewing software not included. This is a digital version of "Geologic Map of Virginia" published in 1993. Available from: https://www.dmme.virginia.gov/commerce/
Geographic coverageAccomack - Northampton

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URL: http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=VAQwa;0
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