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 Formation (-1929)
Froswick Tuffs (-264)
Woundale Tuff (-1284)
Alternative Name(s): none recorded or not applicable
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. 
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. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E030 E039