The BGS Lexicon of Named Rock Units — Result Details

Tower Wood Gravel Member

Computer Code: TWGR Preferred Map Code: TWGr
Status Code: Full
Age range: Eocene Epoch (GE) — Eocene Epoch (GE)
Lithological Description: Unbedded gravel of large, closely packed, unabraded flints in a matrix of white, locally brown-stained, clay and a little sand.
Definition of Lower Boundary: Junction with underlying Upper Greensand marked by a sandy flint-free bed up to 12.5cm thick containing well rounded quartz and schorl pebbles (Pickard, 1949).
Definition of Upper Boundary: Overlain by the Buller's Hill Gravel (fluvial flint gravel).
Thickness: To 8m
Geographical Limits: Great and Little Haldon Hill, south Devon; also occurs within dissolution pipes and hollows near Kingsteignton (Brunsden and others, 1976).
Parent Unit: Haldon Gravel Formation (HGR)
Previous Name(s): Tower Wood Gravel Formation (-3735)
Alternative Name(s): none recorded or not applicable
Type Section  Tower Wood Quarry, Great Haldon, near Exeter, Devon. c.6m of gravel visible to Hamblin (1973). Quarry now degraded - only c.2m of gravel visible. 
Hamblin, R J O. 1973. The Haldon Gravels of South Devon. Proceedings of the Geologists' Association, Vol.84(4), 459-476. 
Selwood, E B, Edwards, R A, Simpson, S, Chesher, J A, Hamblin, R J O, Henson, M R, Riddolls, B W and Waters, R A. 1984. Geology of the countryside around Newton Abbot. Memoir of the British Geological Survey, Sheet 339 (England and Wales). 
Ussher, W A E, 1913. Geology of the country around Newton Abbot. Memoir of the British Geological Survey, Sheet 339. (England and Wales). 
Pickard, R, 1949. The Geology of Milber Down. Report and Transactions of the Devonshire Association for the Advancement of Science, Vol.81, p.217-226. 
Brunsden, D and others. 1976. Tertiary and Cretaceous sediments in solution pipes in the Devonian Limestone of south Devon. Geological Magazine, Vol.113, p.441-447. 
Edwards, R A, 1991. Geology of the Dunchideock district (Devon) 1:10,000, SX88NE. British Geological Survey Technical Report, WA/91/7. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E339 E307 E308