Esmond Igneous Suite - felsic volcaniclastic rock (RIZefv;0)

Esmond Igneous Suite - felsic volcaniclastic rock

Light-colored to dark-gray ash flow tuff, ignimbrite, and felsite; may include some shallow-level intrusive rock. Phenocrysts of quartz, orthoclase, and plagioclase in a fine-grained matrix of quartz, feldspar, biotite, and opaque minerals. Some varieties contain fiamme and lithic fragments. Includes rock mapped formerly as Pennsylvanian felsite at Diamond Hill.

State	Rhode Island
Name	Esmond Igneous Suite - felsic volcaniclastic rock
Geologic age	Late Proterozoic
Lithologic constituents	Major Igneous > Volcanic > Felsic-volcanic (Pyroclastic-ash flow)felsic volcaniclastic rock - Light-colored to dark-gray ash flow tuff, ignimbrite, and felsite; may include some shallow-level intrusive rock. Phenocrysts of quartz, orthoclase, and plagioclase in a fine-grained matrix of quartz, feldspar, biotite, and opaque minerals. Some varieties contain fiamme and lithic fragments.
Comments	Part of Esmond-Dedham Subterrane (West Bay Area)
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.
NGMDB product	NGMDB product page for 19719
Counties	Providence

Esmond Igneous Suite - felsic volcaniclastic rock

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.