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Geologic units in Arlington county, Virginia

Bacons Castle Formation (Tertiary) at surface, covers 1 % of this area
Bacons Castle Formation - Gravel grading upward into sand and sandy clayey silt
Lithology: gravel; sand; silt; clay or mud
Shirley Formation (Quaternary) at surface, covers 7 % of this area
Shirley Formation - Interbedded gravel, sand, silt, clay, and peat; at altitudes to 35-45 ft. (top of unit).
Lithology: gravel; sand; silt; clay or mud; peat
Pliocene Sand and Gravel (Tertiary) at surface, covers 14 % of this area
Pliocene Sand and Gravel - Sandy gravel, gravelly sand, poorly to well-sorted sands, and thin- to medium-beds of clay and silt, at altitudes from 170-320 ft. (top of unit).
Lithology: gravel; sand; clay or mud; silt
Miocene Sand and Gravel (Tertiary) at surface, covers 5 % of this area
Miocene Sand and Gravel - Sandy gravel, sand, silt, and clay.
Lithology: gravel; sand; silt; clay or mud
Potomac Formation (Cretaceous) at surface, covers 28 % of this area
Potomac Formation - Pebbly, poorly sorted quartzo-feldspathic sand interbedded with sandy clay and silt; minor organic-rich clay and silt
Lithology: sand; clay or mud; silt
Sykesville Formation (Cambrian) at surface, covers 29 % of this area
Sykesville Formation - Metasedimentary melange
Lithology: melange
Indian Run Formation (Cambrian) at surface, covers 5 % of this area
Indian Run Formation - Metasedimentary melange
Lithology: melange
Artificial Fill (Quaternary) at surface, covers 4 % of this area
Artificial Fill - Areas filled for construction and waste disposal
Lithology: unconsolidated deposit
Lowland Deposits (Quaternary) at surface, covers 0.1 % of this area
Lowland Deposits - Gravel, sand, silt, and clay. Medium- to coarse-grained sand and gravel; cobbles and boulders near base; commonly contains reworked Eocene glauconite; varicolored silts and clays; brown to dark gray lignitic silty clay; contains estuarine to marine fauna in some areas (includes in part Pamlico, Talbot, Wicomico and Sunderland Formations of earlier reports); thickness 0 to 150 feet.
Lithology: gravel; sand; silt; clay or mud

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Page Last modified: 13:39 on 25-Apr-2014