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)
Haggis Grit And Conglomerate (HGC)
Beds At C (-2092)
Bed B (-3935)
Alternative Name(s): none recorded or not applicable
Stratotypes:
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. 
Reference(s):
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). 
Peach, B N and Horne, J. 1899. The Silurian Rocks of Britain, Volume 1. Scotland. Memoir of the Geological Survey of the United Kingdom. 
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. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S032