Waits River Formation

The Waits River Formation is a late Silurian to early Devonian limestone containing lesser amounts of phyllite and schist.

Waits River Formation Stratigraphic range: late Silurian to early Devonian
Garnet schist and quartzite (Waits River Formation in Vermont)
Type	sedimentary, metamorphic
Sub-units	Standing Pond Volcanic Member
Underlies	Bradford Schist
Lithology
Primary	limestone
Other	phyllite, schist
Location
Region	New England
Country	USA
Extent	Vermont, Massachusetts, New Hampshire
Type section
Named for	Village of Waits River (within Topsham) and stream
Named by	C. H. Richardson, 1906[1]

The description by the USGS is:

Gray quartzose and micaceous crystalline limestone weathered to distinctive brown earthy crust; interbedded and intergradational with gray quartz-muscovite phyllite or schist. Where more metamorphosed the limestones contain actinolite, hornblende, zoisite, diopside, wollastonite, and garnet, and the phyllite and schist, biotite, garnet, and locally andalusite, kyanite, or sillimanite.[2]

References

1. Richardson, C.H., 1906, THE AREAL AND ECONOMIC GEOLOGY OF NORTHEASTERN VERMONT. From the Fifth Report Vermont State Geologist. Argus and Patriot Press, Montpelier, Vermont.
2. Waits River Formation, Mineral Resources On-Line Spatial Data