The BGS Lexicon of Named Rock Units — Result Details

Grampound Formation

Computer Code: GRAD Preferred Map Code: Gmp
Status Code: Pending Upgrade
Age range: Mid Devonian Epoch (DM) — Mid Devonian Epoch (DM)
Lithological Description: Thinly interlaminated grey slaty mudstone and mid-grey siltstone, weathering yellowish green, with sporadic thin beds of sandstone and sparse lenticular limestone.
Definition of Lower Boundary: Faulted contact.
Definition of Upper Boundary: Carrick Thrust (in Mevagissey map area).
Thickness: Unknown
Geographical Limits: At least along the northern margin of the Mevagissey (353) Sheet area and in the northeastern corner of the Falmouth (352) Sheet area.
Parent Unit: Not Available (!)
Previous Name(s): Grampound Group (-1571)
Grampound Grit [Obsolete Name And Code: Use TRSA Or GRAD] (GPG)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Inland exposures in the Grampound area. 
Partial Type Section  Coastal section at Pentewan. 
Reference(s):
none recorded or not applicable
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E353 E354