The Dartmouth Group is an early Devonian lithostratigraphic group (a sequence of rock strata) from north and east Cornwall to southeast Devon in southwest England. The name is derived from the port of Dartmouth. The Group comprises (in ascending order i.e. oldest first) the Whitsand Bay and Bin Down formations. The type area is along the southeast coast of Cornwall. The sequence has had various earlier names including the Dartmouth Beds or Slates.[1]

Dartmouth Group
Stratigraphic range: Lochkovian to Pragian (Devonian)
Rocks of the Dartmouth group at Sugary Cove near Dartmouth
TypeGroup
Sub-unitsWhitsand Bay Formation, Bin Down Formation
UnderliesMeadfoot Group
Thicknessup to 3300m
Lithology
Primarymudstones,
Othersiltstones, sandstones, basaltic lavas, tuffs, hyaloclastite
Location
RegionEngland
CountryUnited Kingdom
Extentnorth and east Cornwall to southeast Devon
Type section
Named forDartmouth

References

edit
  1. ^ British Geological Survey. "Dartmouth Group". BGS Lexicon of Named Rock Units. Retrieved 3 November 2018.