The BGS Lexicon of Named Rock Units — Result Details

Higher Comberoy Formation

Computer Code: HICO Preferred Map Code: HC
Status Code: Full
Age range: Permian Period (P) — Permian Period (P)
Lithological Description: Lower unit of reddish-brown silt and clayey, very fine-grained sand; middle unit of reddish-brown fine-grained breccia; upper unit of reddish-brown clayey, very fine-grained sand.
Definition of Lower Boundary: Not seen: faulted.
Definition of Upper Boundary: Not seen: faulted.
Thickness: Lower unit at least 30m. Middle unit 7-16m. Upper unit at least 9m. (At least 55m in total.)
Geographical Limits: Restricted to small fault-bounded outcrop (0.6km squared) between Brook Hill (ST 002 006)in the west, and Higher Comberoy Farm (ST 016 005) in the east, near Clyst St Lawrence, Devon.
Parent Unit: Exeter Group (EXE)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Area  Higher Comberoy Farm, near Clyst St Lawrence, Devon. Upper unit not exposed; augered around and SW of Higher Comberoy Farm. 
Edwards, R A, 1988. Geology of the Clyst Hydon District (Devon). British Geological Survey Technical Report, WA/88/4. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable