|Name||Waterford Group and Branford Gneiss|
|Geologic age||Proterozoic Z?|
Metamorphic > GneissWaterford Group (may be equivalent in part to Monson Gneiss) - Interlayered part (but layers locally distinct) of Waterford Group, light to dark, generally medium grained gneiss, composed of plagioclase, quartz, and biotite, with hornblende in some layers and microcline in others. Branford Gneiss - Gray to white but rarely pink., medium-grained, well-foliated granitic gneiss, composed of oligoclase, K-feldspar, quartz, biotite, garnet, magnetite, and muscovite.
Metamorphic > AmphiboliteWaterford Group - some layers of amphibolite
|Comments||Part of Eastern Uplands; Avalonian (Continental) Terrane; Avalonian Anticlinorium; Branford Gneiss only = East Haven granitic body (may be equivalent to Sterling Plutonic-Group) (includes Light House Gneiss, Branford Gneiss, and Stony Creek Granite Gneiss) (Proterozoic Z?). Printed map has unit Zb by itself, digital map combines Zb with Zw.|
Rodgers, John, compiler, 1985, Bedrock Geological Map of Connecticut: Connecticut Geological and Natural History Survey, Hartford, Connecticut, 2 sheets, scale 1:125,000.