The BGS Lexicon of Named Rock Units — Result Details

Kempsey Formation

Computer Code: KEY Preferred Map Code: Key
Status Code: Full
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Lithic sandstone and tuffaceous siltstone, purple-green, with poorly sorted angular to subrounded clasts of tuff, agglomerate and acid to intermediate lava (Whittaker, 1980).
Definition of Lower Boundary: Not seen.
Definition of Upper Boundary: Unconformity beneath Permian Bridgnorth Sandstone.
Thickness: Proved thickness of 705.6m (2318 feet).
Geographical Limits: Not known; only proved in Kempsey Borehole; western limit is East Malvern Fault.
Parent Unit: Not Entered (?)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Kempsey No.1 Borehole, Kempsey, near Worcester, Hereford and Worcester (SO84NE/2), from 7562' to base of hole at 9880' (formation not bottomed). 
Reference(s):
Whittaker, A, 1980. Kempsey No.1 Geological well completion report. Report of the Deep Geology Unit, Institute of Geological Sciences, No.80/1. 
Barclay, W J, Ambrose K, Chadwick, R A and Pharaoh, T C. 1997. Geology of the country around Worcester. Memoir of the British Geological Survey, Sheet 199 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E199