The BGS Lexicon of Named Rock Units — Result Details

Wolf Crags Formation

Computer Code: WOCR Preferred Map Code: notEntered
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Diamicton and gravel that form moraines, fluted hummocks and terraces laid down in the uplands of the central part of the Lake District by corrie glaciers and their associated meltwaters during the Loch Lomond Stadial. Two members are recognised: The Wolf Crags Till Member is a yellowish brown sandy diamicton, with clasts of Borrowdale Volcanic Group and Skiddaw Group rocks, and subordinate numbers of clasts of Threlkeld Microgranite. The Wolf Crags Gravel Member forms a series of terraces in the Mosedale Beck valley. It is composed of coarse gravel (with clasts up to 1m diameter) with subordinate amounts of finer gravel and sand. It contains clasts of Borrowdale Volcanic Group rocks and Threlkeld Microgranite.
Definition of Lower Boundary: Unconformable on bedrock or disconformable on the Threlkeld Till Formation of the central Cumbria Glacigenic Group.
Definition of Upper Boundary: Generally the ground surface, but locally overlain by Holocene peat.
Thickness: c.15m at the type site.
Geographical Limits: Central Lake District 1:50k Sheet 29, but probably could also be applied to Loch Lomond Stadial deposits of the Central Cumbria Glacigenic Subgroup on sheets 30, 38 and 39, and elsewhere in Cumbria.
Parent Unit: Central Cumbria Glacigenic Subgroup (CCGL)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Exposure in the western side of the gap cut by the Mother Syke stream in the moraine ridge (at Mothersike Brow) of the Wolf Crags Corrie. C.3km southeast of the village of Threlkeld, central Cumbria. Boardman, J. 1991. 
Type Area  The Mosedale Valley area central Cumbria, from the vicinity of Mosedale Beck Fold to Lobbs, c.3km southeast of the village of Thelkeld, central Cumbria. Boardman, J. 1994, 1996. 
Reference(s):
Boardman, J. 1991. Glacial deposits of the English Lake District. 175-183 in Elhers, J, Gibbard, P L and Rose, J (editors), Glacial deposits in Great Britain and Ireland. [Rotterdam: Balkema.] 
Boardman, J. 1994. Mosedale. 165-172 in Boardman J and Walden, J (editors), The Quaternary of Cumbria: Field Guide. Quaternary Research Association, Oxford. 
Boardman, J. 1996. Classic landforms of the Lake District. Castleden, R and Green, C, (Series editors), Classic landform guides No.8. [Sheffield: Geographical Association in conjunction with the British Geomophological Research Group.] 
Merritt, J W and Auton, C A. 1997. Quaternary lithostratigraphy of the Sellafield district. Nirex Science Report SA/97/045 (Issue 2.0). [Report prepared for UK Nirex Ltd. 69pp, 5 tables, 20 figures, 14 enclosures and one appendix.] 
Merrit, J W and Auton, C A. 2000. An outline of the lithostratigraphy and depositional history of Quaternary deposits in the Sellafield district, west Cumbria. Proceedings of the Yorkshire Geological Society, Vol.53, 129-154 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable