The BGS Lexicon of Named Rock Units — Result Details

Melbury Sandstone Member

Computer Code: MYS Preferred Map Code: MelS
Status Code: Full
Age range: Cenomanian Age (KE) — Cenomanian Age (KE)
Lithological Description: Richly fossiliferous, glauconitic, fine-grained sand and weakly cemented sandstone with a considerable coccolith content.
Definition of Lower Boundary: The lower boundary is placed above the highest bed of chert of the Boyne Hollow Chert where present or at a distinct erosion surface above which a significant coccolith content becomes apparent.
Definition of Upper Boundary: The upper boundary is placed at the incoming of marl that is taken as the basal bed of the overlying remainder of the West Melbury Marly Chalk Formation. This can commonly be a minor erosion surface.
Thickness: 0 to 6m (1.22m at type locality)
Geographical Limits: Known for Dorset and Wiltshire. From Iwerne Courtenay (ST 860 130) northwards towards the limit of the Shaftesbury sheet (313). Northwards, through the Wincanton area, the Melbury Sandstone continues (previously informally called the Rye Hill Sand) and, farther north, onto the Salisbury Sheet area (Nadder Valley) and in the western part of the Devizes Sheet area. To the east the member is equivalent to the Glauconitic Marl Member.
Parent Unit: West Melbury Marly Chalk Formation (WMCH)
Previous Name(s): Cenomanian Sands (-1719)
Warminster Greensand (-4809)
Passage Beds (-3236)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Old quarry (now filled), 700m at 276 degrees from Melbury Abbas church. Section recorded by Jukes-Browne and Hill (1900, 1903). 
Reference(s):
Drummond, P U O. 1970. The Mid-Dorset Swell. Evidence of Albian-Cenomanian Movements in Wessex. Proceedings of the Geologists' Association, Vol.81, 679-714. 
Kennedy, W J. 1970. A correlation of the uppermost Albian and the Cenomanian of South-West England. Proceedings of the Geologists' Association, Vol.81, 613-677. 
Bristow, C R, 1989. Geology of the East Stour - Shaftesbury district (Dorset) British Geological Survey Technical Report WA/89/58. 
Bristow, C R, 1991. Geology of Sheet ST 81 (Shillingstone-Compton Abbas, Dorset). British Geological Survey Technical Report WA/91/03. 
Mottram, B H. 1957. Whitsun field meeting at Shaftesbury. Proceedings of the Geologists' Association, Vol.67, (for 1956), 160-167. 
White, H J O. 1923. The geology of the country south and west of Shaftesbury. Memoir of the Geological Survey of Great Britain, Sheet 313 (England and Wales). 
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. 
Jukes-Browne, A J and Hill, W. 1903 The Cretaceous Rocks of Britain, Vol.2. The Lower and Middle Chalk of England. Memoir of the Geological Survey of Great Britain. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E281 E313 E314