The BGS Lexicon of Named Rock Units — Result Details

Lathkill Lodge Lava Member

Computer Code: LOB Preferred Map Code: notEntered
Status Code: Full
Age range: Brigantian Substage (CX) — Brigantian Substage (CX)
Lithological Description: At Lathkill Dale, basalt lava includes marmorised limestone fragments. In the Haddon Fields Borehole the member mainly comprises, in upward sequence: 20m of bedded tuff, 8m of partly brecciated basalt, 40m of hyaloclastite and 17.5m of amygdaloidal basalt.
Definition of Lower Boundary: Not seen at outcrop. In the Haddon Fields Borehole tuffs of the Lathkill Lodge Lava Member rest upon grey and dark grey bioclastic limestone, included within the Fallgate Volcanic Formation.
Definition of Upper Boundary: In the Haddon Fields Borehole basalt of the Lathkill Lodge Lava Member is overlain by pale grey and cherty limestones with some calcilutites, included within the Fallgate Volcanic Formation.
Thickness: In the Haddon Fields Borehole the member is 85.5m thick. At Lathkill Dale there is about 5m of lava.
Geographical Limits: Present at outcrop in the lower part of Lathkill Dale, north of Alport. Also proved in Boreholes at Alport (SK 23 65). Occurs about 27m (Shirley, 1950) or 19m (Aitkenhead, et al., 1985) below the Conksbury Bridge Lava Member.
Parent Unit: Fallgate Volcanic Formation (FV)
Previous Name(s): Lathkill Lodge Basalt (-2297)
Lathkill Lodge Lavas (-2298)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Lathkill Dale: Section of 3.8 m of weathered vesicular basalt, representing much of the thickness of the member in this area. Aitkenhead et al., 1985. 
Type Section  Haddon Fields Borehole SK26NW/25: the entire thickness of 85.5 m of tuffs, basalts and hyaloclastites proved in this confidential borehole. Aitkenhead et al., 1985. 
Reference(s):
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. 
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. 
Shirley, J. 1950. The stratiographical distribution of the lead-zinc ores of Mill Close Mine, Derbyshire and the future prospects of the area. XVIII International Geological congress, London, Vol 7, 353-361. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E111