The BGS Lexicon of Named Rock Units — Result Details

Woundale Tuff Formation

Computer Code: WOU Preferred Map Code: Wou
Status Code: Full
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Heterogenous andesitic tuff and lapilli-tuff, with impersistent interbeds of volcaniclastic sandstone, particularly in the upper part of the Formation.
Definition of Lower Boundary: Taken at the change from massive, uniform, dacitic lapilli-tuff of the Froswick Tuff Formation, to variable andesitic tuff and lapilli-tuff lithofacies, at a generally conformable contact interpreted to be an erosion surface of low relief.
Definition of Upper Boundary: Defined by the base of the overlying Seathwaite Fell Sandstone Formation, which here is an erosion surface overlain by well bedded volcaniclastic sedimentary rocks.
Thickness: To 800m
Geographical Limits: From Stock Ghyll, Ambleside to Troutbeck, Kentmere and Longsleddale to Mosedale and around High Street, eastern Lake District.
Parent Unit: Borrowdale Volcanic Group (BVG)
Previous Name(s): Woundale Tuff (-1284)
Froswick Tuffs (-264)
Woundale Formation (-1929)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Woundale, Hart Crag and Doup Crag, on the north side of the A592 between Troubeck and the Kirkstone Pass in the Kendal area of Cumbira. 
Reference(s):
Mitchell, G H, 1929. The succession and structure of the Borrowdale Volcanic Series in Troutbeck, Kentmere and the western part of Long Sleddale (Westmorland). Quarterly Journal of the Geological Society of London, Vol. 85, 9-44. 
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