| 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 [Obsolete Name and Code: Use STT]
(-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): |
| 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. |
| 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. |
| 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
|
