Ironbound Mountain Formation - rhythmically graded member

Light- to medium-gray, fine-grained micaceous metasandstones that grade upward into subordinate dark-gray slate or phyllite; some rocks are calcareous. Graded sets range in thickness from a few centimeters to about a meter; typically they are 10 to 30 cm thick. Contact with Di gradational. Part of the Connecticut Valley Trough.
State Vermont
Name Ironbound Mountain Formation - rhythmically graded member
Geologic age Lower Devonian
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > MetasandstoneLight- to medium-gray, fine-grained micaceous metasandstones that grade upward into subordinate dark-gray slate or phyllite; some rocks are calcareous.
Metamorphic > Metasedimentary > Metaclastic > PhylliteLight- to medium-gray, fine-grained micaceous metasandstones that grade upward into subordinate dark-gray slate or phyllite; some rocks are calcareous.
Metamorphic > Metasedimentary > Metaclastic > SlateLight- to medium-gray, fine-grained micaceous metasandstones that grade upward into subordinate dark-gray slate or phyllite; some rocks are calcareous.
References
NGMDB product
Counties Essex