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
Stratotypes:
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. 
Reference(s):
Hamblin, R J O. 1973. The Haldon Gravels of South Devon. Proceedings of the Geologists' Association, Vol.84(4), 459-476. 
Ussher, W A E, 1913. Geology of the country around Newton Abbot. Memoir of the British Geological Survey, Sheet 339. (England and Wales). 
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). 
Edwards, R A, 1991. Geology of the Dunchideock district (Devon) 1:10,000, SX88NE. British Geological Survey Technical Report, WA/91/7. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E339 E307 E308