The BGS Lexicon of Named Rock Units — Result Details

Armathwaite-Cleveland Dyke

Computer Code: CADY Preferred Map Code: CADY
Status Code: Full
Age range: Paleocene Epoch (GP) — Paleocene Epoch (GP)
Lithological Description: Porphyritic basaltic andesite with plagioclase and pyroxene phenocrysts in a devitrified glassy groundmass. Locally it is amygdaloidal.
Definition of Lower Boundary: Not applicable.
Definition of Upper Boundary: Not applicable.
Thickness: The dyke is generally 22 - 28 m. wide and 430 km. in mapped extent. [Macdonald, et al. 1988].
Geographical Limits: The dyke is mapped from the coastal area of north-eastern England, across northern England, the Southern Uplands and Midland Valley of Scotland. It can be traced as part of a dyke swarm to the Isle of Mull.
Parent Unit: Mull Dyke-Swarm (MULD)
Previous Name(s): Cleveland, Cockfield And Armathwaite Dyke (-4512)
Cleveland-Armathwaite-Barassie-Stevenson-Great Cumbrae-Toward Point Dyke (-2660)
Alternative Name(s): Cleveland - Armathwaite Dyke. Cleveland Dyke On BGS Published Maps
Stratotypes:
Reference Section  On the south side of Skeoch Hill, 2.5 km. north-west of Shawhead, Dumfries and Galloway. McMillan, A A. 2002. 
Reference(s):
Dagley, P, Skelhorn, R R, Mussett, A E, Styles, P and Walsh, J N. The Cleveland Dyke in southern Scotland. British Geological Survey Technical Report, WA/98/20. 
Macdonald, R, Wilson, L, Thorpe, R S, and Martin, A. 1988. Emplacement of the Cleveland Dyke: evidence from geochemistry, mineralogy, and physical modelling. Journal of Petrology, Vol.29, 559 - 583. 
Teall, J H H. 1884. Petrological notes on some north-of-England dykes. Quarterly Journal of the Geological Society of London, Vol. 40, p. 209 - 247. 
Holmes, A and Harwood, H F. 1929. The tholeiite dykes of the north of England. Mineralogical Magazine, Vol. 22, p. 1 - 52. 
Musset, A E, Dagley, P and Skelhorn, R R. 1988. Time and duration of activity in the British Tertiary igneous province. p. 337 - 348. Early Tertiary volcanism and the opening of the NE Atlantic. Morton, A C and Parson, L M (eds.). Special Publication of the Geological Society of London, No. 39. 
McMillan, A A. 2002. Geology of the New Galloway and Thornhill District. 2002. Memoir of the British Geological Survey. Sheets 9W and 9E (Scotland). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S009 S009 E017 E018 E024 E025 E031 E032 E033 E034 E035 E043 E044 S014 S014 S006 S015