The BGS Lexicon of Named Rock Units — Result Details

Cock Rig Formation

Computer Code: CKRI Preferred Map Code: CKRI
Status Code: Full
Age range: Telychian Age (ST) — Telychian Age (ST)
Lithological Description: Medium- and coarse-grained, locally flaggy, cross-stratified sandstones, interbedded with clast-supported and poorly graded conglomerates.
Definition of Lower Boundary: Conformable on Deerhope Formation: Lowest pinkish-grey medium- to coarse-grained sandstone.
Definition of Upper Boundary: Conformable: highest olive medium-grained sandstone below grey-green mudstones of the Wether Law Linn Formation.
Thickness: 80-97m
Geographical Limits: Pentland Hills, Midland Valley.
Parent Unit: North Esk Group (NSK)
Previous Name(s): Bed C (-3303)
Upper Part Of Deerhope Formation (-1436)
Beds At C (-2092)
Haggis Grit And Conglomerate (HGC)
Bed B (-3935)
Alternative Name(s): none recorded or not applicable
Partial Type Section  Top of Cock Rig Formation and base of Wether Law Linn Formation, Lynslie Burn, 920m south of Wether Law summit. 
Type Section  North Esk river, 450-560m upstream of North Esk Reservoir. 
Partial Type Section  Top of Deerhope Formation and base of Cock Rig Formation, Deerhope Burn, 490m north of the mount summit. 
Peach, B N and Horne, J. 1899. The Silurian Rocks of Britain, Volume 1. Scotland. Memoir of the Geological Survey of the United Kingdom. 
Mitchell, G H. 1962. The geology of the neighbourhood of Edinburgh. (Explanation of Sheet 32) Third Edition. (Reprinted 1980). Memoir of the Geological Survey of Great Britain (Scotland). 
Robertson, G, 1986. North Esk Inlier. 174-185 in Lothian Geology. An Excursion Guide. McAdam, A D and Clarkson, E N K (editors). [Edinburgh: Scottish Academic Press.] 
Howell, H H and Geikie, A, 1861. The Geology of the neighbourhood of Edinburgh (1st edition). Memoir of the Geological Survey, Scotland. 
Lamont, A, 1952. Ecology and correlation of the Pentlandian - a new division of the Silurian System in Scotland. 27-32 in Faunal and floral facies and zonal correlation. Dighton-Thomas, H (editor). Report of the 18th Session of the International Geological Congress, Great Britain, 1948, Pt.10. 
Tipper, J C, 1976. The stratigraphy of the North Esk Inlier. Scottish Journal of Geology, Vol.12, Pt, 15-22. 
Henderson, J and Brown, D J, 1870. On the Silurian rocks of the Pentland Hills. Transactions of the Edinburgh Geological Society, Vol.1, 266-272. 
Robertson, G, 1989. A palaeoenvironmental interpretation of the Silurian rocks in the Pentland Hills, near Edinburgh, Scotland. Transactions of the Royal Society of Edinburgh: Earth Sciences, Vol.80, 127-141. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: