The BGS Lexicon of Named Rock Units — Result Details

Telegraph Hill Sands Member

Computer Code: THSS Preferred Map Code: notEntered
Status Code: Full
Age range: Albian Age (KA) — Albian Age (KA)
Lithological Description: Green and red glauconitic sandstone, generally fine-grained, clay-free and well-sorted, with several layers of chertified sandstone. A massive basal conglomerate is locally developed and in places strongly silicified, with oyster-encrusted pebbles and scattered corals. Lenses of shelly, indurated sandstone containing silicified bivalves occur in the lower part of the member.
Definition of Lower Boundary: Unconformable contact with Permian breccias. In some places the unconformity is irregular and overlain by a massive, locally silicified, highly fossiliferous conglomerate; elsewhere the unconformity is relatively flat and overlain by a bed of derived pebbles.
Definition of Upper Boundary: Contact with the overlying Woodlands Sands Member, marked by an upward facies-change to coarser, less well-sorted and more clay-rich sandstone.
Thickness: Up to 5.26m.
Geographical Limits: Haldon Hills in Devon (Sheet 339).
Parent Unit: Upper Greensand Formation (UGS)
Previous Name(s): Haldon Sands (-1299)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Road cutting [SX 912 836], Telegraph Hill, Great Haldon, Selwood et al. (1984). Exposed the full succession when opened. 
Reference Section  Temporary road cutting at Woodlands Goyle [SX 902 840], at the north end of Great Haldon, Selwood et al. (1984). 
Reference(s):
Jukes-Browne, A J and Hill, W. 1900. The Cretaceous Rocks of Britain. 1. Gault and Upper Greensand. Memoir of the Geological Survey of Great Britain. 
Hamblin, R J O and Wood, C J. 1976. The Cretaceous (Albian-Cenomanian) stratigraphy of the Haldon Hills, south Devon, England. Newsletters on Stratigraphy, Vol.4, 135-149. 
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). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable