Littleton Formation (VTDl;0)

Littleton Formation - Gray slate and phyllite containing interbeds of gray schistose quartzite 1/4 inch to 6 inches thick. West of Guildhall are lustrous, light to dark gray biotite-garnet phyllite and schist, some slate, and subordinate quartzite and impure quartzite. South of Bellows Falls gray phyllite passes eastward into gray mica schist containing porphyroblasts of biotite, garnet, and staurolite.

State	Vermont
Name	Littleton Formation
Geologic age	Devonian
Original map label	Dl
Comments	Part of Eastern Vermont
Primary rock type	slate
Secondary rock type	phyllite
Other rock types	quartzite; schist; mica schist
Lithologic constituents	Major Metamorphic > Metasedimentary > Metaclastic > Phyllitelight to dark gray biotite-garnet phyllite and schist Metamorphic > Metasedimentary > Metaclastic > Slate Minor Metamorphic > Metasedimentary > Metaclastic > Quartziteinterbeds of gray schistose quartzite 1/4 inch to 6 inches thick; West of Guildhall are subordinate quartzite and impure quartzite. Metamorphic > Schistlight to dark gray biotite-garnet phyllite and schist; South of Bellows Falls gray phyllite passes eastward into gray mica schist containing porphyroblasts of biotite, garnet, and staurolite.
Map references	Nicholson, S.W., Dicken, C.L., Horton, J.D., Foose, M.P., Mueller, J.A.L., and Hon, Rudi, 2006, Preliminary integrated geologic map databases for the United States: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, Rhode Island, and Vermont: U.S. Geological Survey Open-File Report 2006-1272. [http://pubs.er.usgs.gov/publication/ofr20061272]
Unit references	Doll, C.G., Cady, W.M., Thompson, J.B., Jr., and Billings, M.P., 1961, Centennial Geologic Map of Vermont: Vermont Geological Survey, Miscellaneous Map MISCMAP-01, scale 1:250,000.
Geographic coverage	Essex - Windham - Windsor