Scientific data near [37.71668,-76.69945]

Search area extends approximately 2.2 km east-west and 2.8 km north-south.

Geographic context

Counties, states, countries, continents, or oceans
Middlesex	county
Virginia	state
United States	country
North America	continent
Land	continent
Map quadrangles, from USGS or Canadian NTS
Church View	quadrangle 1:24,000 scale
Tappahannock	quadrangle 1:100,000 scale
Richmond	quadrangle 1:250,000 scale
Watershed boundaries (USGS hydrologic units)
Lower Rappahannock	hydrologic unit
Lower Chesapeake	hydrologic accounting unit
Lower Chesapeake	hydrologic subregion
Mid Atlantic	hydrologic region

Geology of US states

Digital geologic maps of the US states with consistent lithology, age, GIS database structure, and format

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Unit	State	Lithology
Windsor Formation	VA	Tertiary-Quaternary
Chesapeake Group	VA	Tertiary

Airborne geophysical surveys

Aerial surveys of magnetic anomaly and gamma ray emission; older surveys were analog record which have been digitized, newer surveys collected data in digital form.

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ID	Data type	Description
Southeast Virginia	M-Dz	Southeast Virginia 9173 line km with spacing 3.20 km over parts of VA

The continental crust

Seventy-seven major components of the North American continent were delineated at a general scale (1:5,000,000); including the general composition, geological environment, and types of primary metals endowments that can be expected in each domain.

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Domain	Crust type	Region
Carolinia	Oceanic arc	Southeastern Laurentia and Appalachians

Prospect- and mine-related features on USGS topographic maps

Symbols indicating mining-related features digitized from historical USGS topographic maps in the western part of the conterminous US. Includes prospect pits, mine shafts and adits, quarries, open-pit mines, tailings piles and ponds, gravel and borrow pit

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Feature ID	Feature type	Feature name
Gravel Pit	point
Gravel Pit	polygon