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
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). 
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: