[1] It consists of clayey, silty, very shelly, glauconitic sand.

[1] Fossil records indicate that this stratigraphic unit was created during the Paleocene.

[2] When uncovered, it appears dark green to gray-green, argillaceous, with well sorted fine- to medium-grained sand and locally indurated shell beds.

[4] A few hard streaks of shells or thin "rock" layers are often reported but appear to be more abundant in the sections south of the James River.

Older publications describe the Aquia as being of Eocene age.