The BGS Lexicon of Named Rock Units — Result Details

Hangman Sandstone Group [Obsolete Name And Code: See HASA]

Computer Code: HGMS Preferred Map Code: notEntered
Status Code: Index Level
Age range: Eifelian Age (DI) — Givetian Age (DV)
Lithological Description: Quartzitic sandstones, locally coarse or conglomeratic, some slates. Colours red, green, variegated. Rare plant remains marine fossils at upper boundary.
Definition of Lower Boundary: Drawn at the base of the Triscombe Beds where it rests conformably upon the Lynton Beds.
Definition of Upper Boundary: Drawn at the conformable upward passage from the Sherry Combe Beds to the Ilfracombe Beds.
Thickness: 1219m approx.
Geographical Limits: North Devon, England.
Parent Unit: Not Entered (?)
Previous Name(s): Hangman Grits [Obsolete Name And Code: Use HASA] (HAG)
Alternative Name(s): Hangman Sandstone Formation
Stratotypes:
Type Area  Hangman Hill to Martinhoe, east of Combe Martin, North Devon. 
Reference(s):
House, M R, Richardson, J B, Chaloner, W G, Allen, J R L, Holland, C H and Westoll, T S. 1977. A Correlation of Devonian rocks of the British Isles. Geological Society of London, Special Report No.8, Scottish Academic Press, Edinburgh. 
Sedgwick, A and Murchison, R I, 1836. A Classification of the old slate rocks of North Devonshire. British Academy for the Advancement of Science, Report No.5, p.95. 
Hallam, A D, 1934. The geology of the Hangman Grits of the Quantock Hills. Geological Magazine, Vol.71, p.433-446. 
Etheridge, R. 1867. On the physical structure of west Somerset and north Devon and on the palaeontological value of the Devonian fossils. Quarterly Journal of the Geological Society of London, Vol. 23, p.568-698. 
Evans, J W. 1922. The geological structure of the country round Combe Martin. Proceedings of the Geologists' Association, Vol.33, 201-228. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable