|Name||Esmond Igneous Suite - augen granite gneiss|
|Geologic age||Late Proterozoic|
Metamorphic > Gneissaugen granite gneiss - Pale- to dark-gray, medium- to coarse-grained, granite gneiss characterized by large feldspar porphyroclasts (> 1 cm). Composition ranges from tonalite to granodiorite to quartz monzonite. Composed of sodic plagioclase, quartz, microcline/orthoclase, biotite, opaque minerals; hornblende and epidote common in more mafic types; accessory apatite, sphene, allanite, and zircon; secondary chlorite. Typically massive, but with strong penetrative foliation and lineation defined by major minerals.
Metamorphic > AmphiboliteCommonly contains structurally conformable layers of amphibolite.
|Comments||Part of Esmond-Dedham Subterrane (West Bay Area). Printed map unit symbol is Zeag, digital map symbol is Zeagg.|
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.
|Counties||Kent - Providence - Washington|