|Name||Gneiss of Highlands massifs (including Fordham Gneiss)|
|Geologic age||Proterozoic Y; may contain some older rocks|
Metamorphic > Gneisspossibly contains: granitic, augen, layered, and mafic gneiss (mixture of Ygr, Yga, Ygn, Ygh, and Ygs).
Metamorphic > Amphibolitefrom unit Ygh
Metamorphic > Schistfrom Ygs
|Comments||Part of Western Uplands; Proto-North American (Continental) Terrane - Proterozoic Massifs - "Grenville". "Rocks described below" in the description include the following units: Ygr (Pink granitic gneiss), Yga (Augen gneiss), Ygn (Layered gneiss), Ygh (Hornblende gneiss and amphibolite), and Ygs (Rusty mica schist and gneiss).|
Rodgers, John, compiler, 1985, Bedrock Geological Map of Connecticut: Connecticut Geological and Natural History Survey, Hartford, Connecticut, 2 sheets, scale 1:125,000.
|Counties||Fairfield - Litchfield|