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Stratigraphy and petrography of the Iron Mountain formation (basal part of the Unicoi group) in southwestern Virginia
The Precambrian or Canbrian Unicoi Formation in
southwestern Virginia consists of at least three litho
logically distinct rock sequences which can be distin
guished as formations. The Uhicoi therefore should be
raised to the rank of group. The lowest rock sequence
is named Iron Mountain Formation; the middle sequence,
consisting of three basalt flowa and inter-layered
claatic sedimentary rocks, an the upper sequence of
clastic sedimentary rocks are not named.