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Poultney Formation

Poultney Formation - White weathering, well-laminated gray slate and chert.
State Massachusetts
Name Poultney Formation
Geologic age Middle and Lower Ordovician
Comments Part of Taconic-Berkshire Zone (Ordovician and Older Rocks); in the Taconic Allochthon
Primary rock type slate
Secondary rock type chert
Other rock types
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Slate
Sedimentary > Chemical > Chert
Map references
Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon at Boston College in 1998.
Unit references
Zen, E-An (ed.), Goldsmith, R. (comp.), Ratcliffe, N.M. (comp.), Robinson, P. (comp.), Stanley, R.S. (comp.), Hatch, N.L., Jr., Shride, A.F., Weed, E.G.A., Wones, D.R., 1983, Bedrock Geologic Map of Massachusetts: U.S. Geological Survey, Reston, VA, scale 1: 250,000.