The BGS Lexicon of Named Rock Units — Result Details

Kirkland Formation

Computer Code: KDF Preferred Map Code: KdF
Status Code: Full
Age range: Abereiddian Stage (O2) — Abereiddian Stage (O2)
Lithological Description: Grey mudstone and siltstone with subordinate beds of brown weathered, pyritic mudstone and dark blue grey calcareous mudstone, interbedded with thick units of volcaniclastic rock and locally intruded by altered basalt and andesite sills [previously lavas]
Definition of Lower Boundary: Not seen
Definition of Upper Boundary: Not seen
Thickness: At least 1000m
Geographical Limits: Restricted to the Cross Fell and Teesdale inliers, Cumbria
Parent Unit: Skiddaw Group (SKG)
Previous Name(s): Milburn Beds (Group, Rocks, Series, Stage) [Obsolete Name And Code: Use KDF] (MBN)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  Milburn Beck, about 2km east of Milburn, Cumbria Arthurton and Wadge, 1981 
Reference Section  Wythwaite Hole and Wythwaite Top, about 3km north of Milburn, Cumbria Arthurton and Wadge, 1981 
Reference(s):
Cooper, A H and Molyneux, S G, 1990. The age and correlation of Skiddaw Group [early Ordovician] sediments in the Cross Fell Inlier [northern England]. Geological Magazine, Vol.127, 147-157. 
Hughes, R A and Kokelaar, B P, 1993. The timing of Ordovician magmatism in the English Lake District and Cross Fell Inliers. Geological Magazine, Vol.130, 369-377. 
Arthurton, R S, and Wadge, A J. 1981. Geology of the country around Penrith. Memoir for geological sheet 24. Institute of Geological Sciences, London, HMSO. 
Burgess, I C and Holliday, D W. 1979. Geology of the country around Brough-under-Stainmore. Memoir for 1:50 000 geological sheet 31 and parts of sheets 25 and 30. Geological Survey of Great Britain (England and Wales). [London: HMSO.] 131pp. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E024 E031 E030 E025