Narragansett Bay Group - Rhode Island Formation (RIPAnbr;0)

Narragansett Bay Group - Rhode Island Formation - In northern Rhode Island, consists of gray to black, fine- to coarse-grained quartz arenite, litharenite, shale, and conglomerate, with minor beds of anthracite and meta-anthracite. In southern Rhode Island, consists of meta-sandstone, meta-conglomerate, schist, carbonaceous schist, and graphite. Plant fossils are common.

State	Rhode Island
Name	Narragansett Bay Group - Rhode Island Formation
Geologic age	Pennsylvanian
Original map label	Pnbr
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.
Primary rock type	arenite
Secondary rock type	shale
Other rock types	conglomerate; coal; metasedimentary rock; meta-conglomerate; schist
Lithologic constituents	Minor Metamorphic > SchistIn southern Rhode Island: schist, carbonaceous schist, and graphite Sedimentary > Clastic > ConglomerateIn northern Rhode Island Sedimentary > Clastic > Mudstone > ShaleIn northern Rhode Island Sedimentary > Clastic > Sandstone > AreniteIn northern Rhode Island: gray to black, fine- to coarse-grained quartz arenite, litharenite Metamorphic > Metasedimentary > Metaclastic > MetaconglomerateIn southern Rhode Island: meta-sandstone, meta-conglomerate Metamorphic > Metasedimentary > Metaclastic > MetasandstoneIn southern Rhode Island: meta-sandstone, meta-conglomerate Incidental Sedimentary > Coal > AnthraciteIn northern Rhode Island: minor beds of anthracite and meta-anthracite
Map references	Hermes, O.D., Gromet, L.P., Murray, D.P., Hamidzada, N.A., 1994, Geologic Map of Rhode Island, file name = bedrock_shp.zip (870kb) obtained from Rhode Island Geographic Information System, http://www.edc.uri.edu/rigis-spf/Statewide/state.html#geology , shapefile or interchange file, scale 1/100,000. [http://www.edc.uri.edu/rigis-spf/Statewide/state.html#geology]
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.
Geographic coverage	Bristol - Kent - Newport - Providence - Washington