The BGS Lexicon of Named Rock Units — Result Details

Stour Formation

Computer Code: STOU Preferred Map Code: Sto
Status Code: Full
Age range: Oxfordian Age (JO) — Oxfordian Age (JO)
Lithological Description: Alternating sequence of oolitic limestone and clay, commonly oolitic, with generally only a minor sand content.
Definition of Lower Boundary: Incoming of ooliths, generally accompanied by a significant drop in, or elimination of, sand.
Definition of Upper Boundary: At the top of the non-bioclastic or evenly graded bioclastic limestone.
Thickness: 17 - 28m
Geographical Limits: From the eastern edge of the Yeovil Sheet (312), across the Shaftesbury Sheet (313) and the northern part of the Wincanton Sheet (297).
Parent Unit: Corallian Group (CR)
Previous Name(s): Osmington Oolite Series (-1450)
Berkshire Oolite Series And Osmington Oolite Series (-1847)
Stour Formation And Osmington Formation (-4905)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Cannings Court Borehole (ST70NW/2) from 2.8 - 19.9m depth. 
Type Section  East Stour Borehole ST82SW/9 (5.0 - 28.2m). 
Type Section  Hazelbury Bryan Borehole (ST70NE/3) from 6.1 - 25.25m depth. 
Reference(s):
Bristow, C R, 1989. Geology of the East Stour - Shaftesbury district (Dorset) British Geological Survey Technical Report WA/89/58. 
Bristow, C R, 1990. Geology of the West Stour - Cucklington district. British Geological Survey Technical Report WA/90/48. 
Arkell W J, 1933. The Jurassic System in Great Britain [Oxford: Clarendon Press.] 
Bristow, C R, 1989. Geology of Sheets 71NE and 71SE. (Marnhull-Sturminster Newton, Dorset) Part of 1:10,000 Sheet 313 (Shaftesbury). British Geological Survey Technical Report WA/89/59. 
Freshney, E C. 1989. Geology of Sheets ST70NW and ST70NE. (Hazelbury Bryan-Mappowder district, Dorset). British Geological Survey Technical Report WA/90/51. 
Gutmann, K, 1970. The Corallian Beds at Todber and White Way Hill in north Dorset. Proceedings of Dorset Natural History and Archaeological Society, Vol.91, p.123-133. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E281 E313