The BGS Lexicon of Named Rock Units — Result Details

Shothouse Spring Tuff Member

Computer Code: STT Preferred Map Code: STT
Status Code: Full
Age range: Brigantian Substage (CX) — Brigantian Substage (CX)
Lithological Description: A green tuff containing beds of coarse lapilli in a calcareous cement. To the east of Grangemill (SK 244 578) the tuffs interdigitate with limestone in the Bottom Leys Farm Borehole (SK25NE/41) (SK 2587 5795). In the latter, the tuffs include medium-to coarse-grained, angular to subrounded fragments of mudstone and limestone in a fine-grained grey to dark grey or green matrix.
Definition of Lower Boundary: The tuffs of the Shothouse Spring Tuff Member rest upon thickly bedded limestones of the Monsal Dale Limestone Formation.
Definition of Upper Boundary: The tuffs of the Shothouse Spring Tuff Member are overlain by thickly bedded limestones of the Monsal Dale Limestone Formation.
Thickness: Unknown in the type area. Seen as 3 leaves, in ascending order 6.90, 0.32 and 4.93 m thick.
Geographical Limits: Outcrop is localised to the vicinity of Shothouse Spring (SK 242 589). Proved in a borehole at Bottom Leys Farm, Bonsall SK25NE/41, at SK 2587 5795.
Parent Unit: Monsal Dale Limestone Formation (MO)
Previous Name(s): Shothouse Spring Tuff (-1209)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Shothouse Spring (SK242 589): Series of poor exposures 1km to the south-west and south-east of Shothouse Spring. Aitkenhead et al., 1985. 
Reference(s):
Aitkenhead, N, Chisholm, J I and Stevenson, I P. 1985. Geology of the country around Buxton, Leek and Bakewell. Memoir of the British Geological Survey, England and Wales Sheet 111. 
Smith, E G, Rhys, G H and Eden, R A. 1967. Geology of the country around Chesterfield, Matlock, and Mansfield. Memoir of the Geological Survey of Great Britain. England and Wales Sheet 112. 
Walters, S G and Ineson, P R. 1981. A review of the distribution of and the correlation of igneous rocks in Derbyshire, England. Mercian Geologist, Vol. 8, 81-132. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E111 E112