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Mineral Resources On-Line Spatial Data

Raritan Formation

Raritan Formation - Red, white, gray, and black clay and poorly lithified white sand. Black clay contains lignite fragments and pyrite and siderite nodules. Exposed only in a few wave-cut bluffs on Block Island, but inferred to have originally onlapped both the Esmond-Dedham and Hope Valley subterranes. This unit may occur as large glacial erratic blocks enclosed in till, and may not represent in situ bedrock.
StateRhode Island
NameRaritan Formation
Geologic ageCretaceous
Original map labelKr
CommentsPart of Avalon Terrane
Primary rock typeclay or mud
Secondary rock typesand
Other rock types
Lithologic constituents
Unconsolidated > Fine-detrital > ClayRed, white, gray, and black clay. Black clay contains lignite fragments and pyrite and siderite nodules.
Unconsolidated > Coarse-detrital > Sandpoorly lithified white sand
Map references
Hermes, O.D., Gromet, L.P., Murray, D.P., Hamidzada, N.A., 1994, Geologic Map of Rhode Island, file name = (870kb) obtained from Rhode Island Geographic Information System, , shapefile or interchange file, scale 1/100,000.
Unit references
Hermes, O.D. (comp.), Gromet, L.P. (comp.), Murray, D.P. (comp.), Hamidzada, N.A., Skehan, J.W., and Mosher, S., 1994, Bedrock geologic map of Rhode Island: Rhode Island Map Series No. 1, Kingston, Rhode Island, scale 1: 100,000.

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