| State | Connecticut |
|---|---|
| Name | Felsic gneiss member [of Quinebaug Formation] |
| Geologic age | Middle Ordovician or older |
| Lithologic constituents | Major
Metamorphic > GneissLight- to medium-gray, fine- to medium-grained gneiss, composed of plagioclase, quartz, biotite, and muscovite, commonly with K-feldspar.
|
| Comments | Part of Eastern Uplands; Iapetus (Oceanic) Terrane - Merrimack Synclinorium |
| References | Rodgers, John, compiler, 1985, Bedrock Geological Map of Connecticut: Connecticut Geological and Natural History Survey, Hartford, Connecticut, 2 sheets, scale 1:125,000. |
| NGMDB product | |
| Counties | New London - Windham |