State | Rhode Island |
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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.
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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 | |
Counties | Providence |