The BGS Lexicon of Named Rock Units — Result Details

Dykebar Limestone

Computer Code: DYLS Preferred Map Code: notEntered
Status Code: Index Level
Age range: Asbian Substage (CR) — Asbian Substage (CR)
Lithological Description: A pale to dark grey, argillaceous, shelly, bioclastic limestone, interpreted to be of marine origin.
Definition of Lower Boundary: Generally seen as a change from marine mudstone (Dykebar and Balmore Marine bands) belonging to Lawmuir Formation overlying thin coal or seatrocks.
Definition of Upper Boundary: Generally a changes to a marine mudstone, the Dykebar and Balmore Marine bands Dykebar and Balmore Marine bands, belonging to the Lawmuir Formation, and overlain by non-marine sandy strata
Thickness: Up to 1.4 m thick in the Paisley and Glasgow districts, elsewhere represented by the Dykebar and Balmore Marine Bands.
Geographical Limits: The Paisley and Glasgow area of the Midland Valley of Scotland.
Parent Unit: Lawmuir Formation (LWM)
Previous Name(s): Netherfield Limestone (-2161)
Netherfield Limestone Bed [Obsolete Name And Code: Use DYLS] (NFLM)
Alternative Name(s): Fiddler Shell Bed
Stratotypes:
Reference Section  The Hurlet Borehole NS56SW/333, where it is 0.72m thick in two leaves, at a base depth of 84.26m. 
Reference(s):
Forsyth, Hall and McMillan. Hall, Browne and Forsyth. 1998. Geology of the Glasgow district. Memoir for 1:50000 Geological Sheet 30E (Scotland) pp27-30 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S023 S030 S030