The BGS Lexicon of Named Rock Units — Result Details

Scalehow Tuff Formation

Computer Code: SCW Preferred Map Code: Scw
Status Code: Full
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Andesitic and dacitic lapilli-tuff, and intercalated tuff, with some bedded volcaniclastic sandstone in the upper part of the formation, and some accretionary lapilli-tuff in the tuff sequence.
Definition of Lower Boundary: Taken at the sharp change from andesite and dacite sheets of the Birker Fell Andesite Formation to a dominantly pyroclastic sequence, along a conformable contact.
Definition of Upper Boundary: Defined by the base of silicic ignimbrites of the Whelter Knotts Formation.
Thickness: 0 - 340 m thick.
Geographical Limits: Patterdale Common, Martindale and Riggindale, south-east of Ullswater, Cumbria.
Parent Unit: Borrowdale Volcanic Group (BVG)
Previous Name(s): Birk Fell Group (-1170)
Scalehow Formation (-3662)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  From Hare Shaw to Scalehow Beck, Birk Fell, Ullswater, Cumbria. Woodhall, 2000. 
Reference(s):
Woodhall, D G. 2000. The geology of the Haweswater and Martindale areas of the north-eastern Lake District. British Geological Survey Technical Report WA/00/55. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E030 E039