Phyllite, schist, metagraywacke.
Graywacke, shale
(Including Fishkill limestone and dolostone): Copake Formation ?-limestone, dolostone; Rochdale Formation-limestone, dolostone; Halcyon Lake Dolostone-locally cherty; Briarcliff Dolostone; Pine Plains Formation-dolostone, shale, oolite; Stissing Formation-dolostone, shale.
Stockbridge Marble.
Locally with minor meta-graywacke lenses.
Shale, argillite, siltstone.
Graywacke, shale
Slate, phyllite, schist, metagraywacke.
Shale, quartzite.
Overprint signifies inequigranular texture.
Shale, argillite, quartzite.
Pelitic schists, amphibolite; Units ?Omb, ?Omc, and ?Omd may be Cambrian eugeosynclinal rocks thrust upon Oma; ?Omd - sillimanite-garnet-muscovite-biotite-plagioclase-quartz gneiss; ?Omc - sillimanite-garnet-muscovite-biotite-quartz-plagioclase schistose gneiss, sillimanite nodules, local quartz-rich layers; ?Omb - discontinous unit of amphibolite and ?Omc-type schist.
Shale, argillite, chert.
Shale, siltstone.
Shale, limestone, conglomerate.
(includes local Dalton Formation at base)-locally conglomeratic.
Briarcliff - locally cherty; Pines Plains - dolostone, shale, oolite.
Copake Formation-limestone, dolostone, siltstone; Rochdale Formation-limestone, dolostone; Halcyon Lake Dolostone-locally cherty.
Interlayered metasedimentary rock and granitic gneiss.
With subordinate leucogranite.
Chaotic mixture of Early Cambrian thru Middle Ordovician pebble to block-size clasts in a pelitic matrix of Middle Ordovician (Barneveld) age. Rims and floors earlier submarine gravity slides of Taconian Orogeny.
With subordinate biotite granitic gneiss, amphibolite, calcsilicate rock.
Columbia County: Pine Plains-dolostone, oolite, shale.
Underlying bedrock geology unknown.
Balmville Limestone
Dolostone, shale.
May contain pyroxenes, hornblende, biotite; locally interlayered with amphibolite; subordinate biotite mesoperthite gneiss.
Contains varying amounts of biotite, garnet, sillimanite; minor marble, amphibolite, rusty paragneiss.
Quartzite, quartz-feldspar gneiss, calcsilicate rock.
South of Troy; shale, conglomerate, limestone.
Minor meta-graywacke lenses. Includes Greylock Schist in Massachusetts.
Pyroxenic amphibolite, hornblende gneiss, commonly biotitic, garnetiferous; subordinate calcsilicate rock.
Shale, slate, cherts.
South of Troy; shale, siltstone.
Occuring as slivers caught along thrusts of later allochthones, or carbonate blocks in Taconic Melange. Also mapped as horses along normal faults.
Shale, argillite, quartzite.
Chaotic mixture of Early Cambrian thru Middle Ordovician pebble to block-size angular to rounded clasts in a pelitic matrix of Middle Ordovician (Barneveld) age. Rims and floors earlier submarine gravity slides of Taconian Orogeny.
Light-green and greenish-gray chlorite-muscovite-albite or chloritoid-rich phyllite. Predominantly dark-gray chloritoid-rich schist in Lenox Mountain.