Narragansett Bay Group - Sachuest Arkose

Gray, smoky-quartz granule-conglomerate, sandstone, and pebble to cobble conglomerate, interbedded with black carbonaceous phyllite. Includes some rock mapped formerly as Pondville Conglomerate.
State Rhode Island
Name Narragansett Bay Group - Sachuest Arkose
Geologic age Pennsylvanian
Lithologic constituents
Sedimentary > Clastic > Conglomerate (Bed)gray, smoky-quartz granule-conglomerate; and pebble to cobble conglomerate
Sedimentary > Clastic > Sandstone (Bed)
Metamorphic > Metasedimentary > Metaclastic > Phylliteinterbedded with black carbonaceous phyllite
Comments Part of Esmond-Dedham Subterrane. Narragansett Bay Group - deposited upon older rocks of both West Bay and East Bay parts of the Esmond-Dedham subterrane.

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.

NGMDB product
Counties Newport