Bull Formation - Bomoseen Graywacke member

Pale-reddish-brown to light-gray-weathering, medium- and fine-grained, massive to thickly bedded, olive-green to gray micaceous quartz-feldspar graywacke and siltstone, locally containing coarse detrital muscovite, biotite, and autoclastic slate chips. Resembles finer grained parts of the Rensselaer Graywacke Member of the Nassau Formation (of Potter, 1972), and the Bird Mountain Grit (of Dale, 1900). Unit interfingers with and grades laterally into the Mettawee slate facies. In the Mt. Anthony area is shown as CZnb (Bomoseen Member of the Nassau Formation of Potter, 1972). Rocks of the Giddings Brook, Sunset Lake, and Bird Mountain slices. Part of the Taconic Allochthon.
State Vermont
Name Bull Formation - Bomoseen Graywacke member
Geologic age Neoproterozoic
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone > Graywacke (Bed)Pale-reddish-brown to light-gray-weathering, medium- and fine-grained, massive to thickly bedded, olive-green to gray micaceous quartz-feldspar graywacke and siltstone, locally containing coarse detrital muscovite, biotite, and autoclastic slate chips.
Sedimentary > Clastic > Siltstone (Bed)Pale-reddish-brown to light-gray-weathering, medium- and fine-grained, massive to thickly bedded, olive-green to gray micaceous quartz-feldspar graywacke and siltstone, locally containing coarse detrital muscovite, biotite, and autoclastic slate chips.
Minor
Metamorphic > Metasedimentary > Metaclastic > SlateLocally containing coarse detrital muscovite, biotite, and autoclastic slate chips.
Comments Unit is labeled as CZbb, but only has Neoproterozoic age? Changed symbol to Zbb.
References
NGMDB product
Counties Addison - Bennington - Rutland