The BGS Lexicon of Named Rock Units — Result Details

Middle Dodd Dacite Formation

Computer Code: MDD Preferred Map Code: MdD
Status Code: Full
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Dacite lava flow: porphyritic, flow-banded, locally autobrecciated, white-weathered.
Definition of Lower Boundary: Incoming of dacite above volcaniclastic sedimentary rocks of Esk Pike Sandstone Formation.
Definition of Upper Boundary: Top not seen in Type Area or Reference Section. Probable equivalent lithologies to the north are overlain by the Helvellyn Tuff and Deepdale Sandstone formations.
Thickness: 0 - 75m
Geographical Limits: Middle Dodd and Little Hart Crag, on north side of the Kirkstone Pass, Cumbria.
Parent Unit: Borrowdale Volcanic Group (BVG)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Summit of Middle Dodd, 1.5km north-north-east of Kirkstone Pass. 
Reference Section  Little Hart Crag 2 - 3km northeast of Kirkstone Pass. 
Reference(s):
Woodhall, D G, 1998. The geology of the Wythburn, Thirlmere and Fairfield areas of the north-east Lake District. British Geological Survey Technical Report WA/98/07. 
Millward, D, Johnson, E W, Beddoe-Stephens, B, Young, B, Kneller, B C, Lee, M K, Fortey, N J, Allen, P M, Branney, M J, Cooper, D C, Hirons, S, Kokelaar, B P, Marks, R J, McConnell, B J, Merritt, J W, Molyneux, S G, Petterson, M G, Roberts, B, Rundle, C C, Rushton, A W A, Scott, R W, Soper, N J and Stone, P. 2000. Geology of the Ambleside district. Memoir of the British Geological Survey, England and Wales, Sheet 38. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E030 E039 E038 E029