State | Vermont |
---|---|
Name | Northfield Formation |
Geologic age | Lower Devonian and Upper Silurian |
Lithologic constituents |
Major
Metamorphic > Metasedimentary > Metaclastic > PhylliteDark-gray to silvery-gray, lustrous, fine-grained carbonaceous quartz-muscovite phyllite and silicic phyllite.
Metamorphic > Schist > Mica-schistGarnet-rich biotite-muscovite-quartz schist.
Minor
Metamorphic > Metasedimentary > Metaclastic > MetasiltstoneContains millimeter- to centimeter-thick beds of gray quartzite and metasiltstone, and thicker beds of quartz-feldspar grit or quartzite near base.
Metamorphic > Metasedimentary > Metaclastic > QuartziteContains millimeter- to centimeter-thick beds of gray quartzite and metasiltstone, and thicker beds of quartz-feldspar grit or quartzite near base.
|
Comments | On the printed map the unit label is DSn, but in the GIS it is Sn. Changing to DSn to match the printed map; Sn is a mistake according to Greg Walsh (oral communication 2012). |
References | |
NGMDB product | |
Counties | Caledonia - Orange - Orleans - Washington - Windham - Windsor |