The BGS Lexicon of Named Rock Units — Result Details

Barns Ness Limestone [Obsolete Name And Code: Use MIHO]

Computer Code: BNSS Preferred Map Code: MIHO
Status Code: Index Level
Age range: Brigantian Substage (CX) — Brigantian Substage (CX)
Lithological Description: A grey to brownish grey, fine-grained limestone, somewhat dolomitic, slightly bioclastic, crinoidal, interpreted to be of marine origin, with Zoophycus caudagalli trace fossil common.
Definition of Lower Boundary: Generally a conformable change from the rooted top of a c.10m-thick sandstone within the Lower Limestone Formation that directly overlies the Chapel Point Limestone (now the Main Hosie Limestone).
Definition of Upper Boundary: Generally apparently conformable change to pale reddish brown, cross-bedded, medium-grained sandstone within the Lower Limestone Formation. Because of erosion, higher strata in the Lower Limestone Formation are not known in this area.
Thickness: Generally to 0.3m, but seen as 1.8m in East Lothian, although may be locally absent.
Geographical Limits: In East Lothian, in the Barns Ness area near Dunbar.
Parent Unit: Lower Limestone Formation (LLGS)
Previous Name(s): none recorded or not applicable
Alternative Name(s): Barns Ness East Limestone
Stratotypes:
Reference Section  Barns Ness Lighthouse, East Lothian. 
Reference(s):
Davies, A, McAdam, A D and Cameron, I B. 1986. Geology of the Dunbar district. Memoir of the British Geological Survey, Sheet 33E and part of Sheet 41 (Scotland). 
Browne, M A E, Dean, M T, Hall, I H S, McAdam, A D Monro, S K and Chisholm, J I. 1999. A lithostratigraphical framework for the Carboniferous rocks in the Midland Valley of Scotland. British Geological Survey Research Report, RR/99/07. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S033