The BGS Lexicon of Named Rock Units — Result Details

Ravensdale Tuff Member

Computer Code: RDT Preferred Map Code: notEntered
Status Code: Full
Age range: Asbian Substage (CR) — Asbian Substage (CR)
Lithological Description: A banded tuff with lapilli, including vesicles infilled with analcite.
Definition of Lower Boundary: Not seen, but defined as the transition from tuffs of the Ravensdale Tuff Member to underlying limestones of the Bee Low Limestone Member.
Definition of Upper Boundary: Not seen, but defined as the transition from tuffs of the Ravensdale Tuff Member to overlying limestones of the Bee Low Limestone Member.
Thickness: Up to 20 m thick.
Geographical Limits: Restricted to the lower part of Cressbrook Dale (SK 17 74), in the northern part of the Peak District inlier.
Parent Unit: Bee Low Limestone Formation (BLL)
Previous Name(s): Ravensdale Tuff (-4858)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  Stream section near Ravensdale Cottages shows 2.44 m of banded tuff with lapilli. 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. 
Arnold-Bemrose, H. 1894. On the microscopical structure of the Carboniferous dolerites and tuffs of Derbyshire. Quarterly Journal of the Geological Society of London, Vol. 50, 603-644. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E111