Tibbit Hill Formation

Largely metabasalt and minor metasedimentary rocks consisting of massive, fine-grained, dark-green metabasalt flows, pillow basalt, vesicular basalt composed of albite, epidote, chlorite (±actinolite); and interbedded phyllitic grits, feldspathic quartzite, chloritic metawacke, and basaltic tuffaceous metasedimentary rocks, all similar to rocks of the Pinnacle Formation. Volcanics are alkalic to transitional metabasalts. Cover rocks of the Lincoln Mountain massif and northwestern flank of the Green Mountain massif.
State Vermont
Name Tibbit Hill Formation
Geologic age Cambrian and Neoproterozoic
Lithologic constituents
Major
Metamorphic > Metaigneous > Metavolcanic > MetabasaltLargely metabasalt and minor metasedimentary rocks consisting of massive, fine-grained, dark-green metabasalt flows, pillow basalt, vesicular basalt composed of albite, epidote, chlorite (±actinolite). Volcanics are alkalic to transitional metabasalts.
Minor
Metamorphic > MetasedimentaryMinor metasedimentary rocks consisting of massive, fine-grained, dark-green metabasalt flows, pillow basalt, vesicular basalt composed of albite, epidote, chlorite (±actinolite); basaltic tuffaceous metasedimentary rocks
Metamorphic > Metasedimentary > Metaclastic > Metasandstone > MetagraywackeInterbedded chloritic metawacke.
Metamorphic > Metasedimentary > Metaclastic > QuartziteInterbedded feldspathic quartzite.
References
NGMDB product
Counties Franklin