The BGS Lexicon of Named Rock Units — Result Details

Kilbirnie Mudstone Member

Computer Code: KLMD Preferred Map Code: KLMD
Status Code: Full
Age range: Pendleian Substage (CE) — Pendleian Substage (CE)
Lithological Description: Mostly dark grey mudstone with ironstone, sporadic shelly marine bands, and also siltstone, medium-grained rooty grey sandstone and coal. The strata occur in upward-coarsening cycles, some capped by thin coal beds. The member includes the Dalry Clayband Ironstone, a grey argillaceous ironstone, and the Johnstone Shell Bed mudstone, with a marine brachiopod and bivalve fauna.
Definition of Lower Boundary: Taken at the top of the Top Hosie Limestone, the highest group of thin limestones characterized by the presence of Posidonia corrugata.
Definition of Upper Boundary: Taken at the lithological change from mudstone of the Kilbirnie Mudstone Member to the overlying dominantly sandstone-bearing cyclical sequences of the parent Limestone Coal Formation. The upper boundary is diachronous.
Thickness: c.35m
Geographical Limits: Presently used within north Ayrshire.
Parent Unit: Limestone Coal Formation (LSC)
Previous Name(s): Kilbirnie Mudstone Formation (-1625)
Limestone Coal Group (-2759)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Paduff Burn, starting 200m north of Place [NS 3028 5483] to the centre of Kilbirnie [NS 3148 5450] Monro, 1999. 
Reference(s):
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. 
Browne, M A E, Dean, M T, Hall, I H S, McAdam, A D and Monro, S K, 1995. A review of the lithostratigraphy of the Carboniferous rocks of the Midland Valley of Scotland. BGS Technical Report, WA/95/25R. 
Paterson, I B, Hall, I H S & Stephenson, D. 1990. Geology of the Greenock district: Memoir for 1:50000 geological sheet 30W and part of sheet 29E (Scotland). 
Monro, S K. 1999. Geology of the Irvine District. Memoir of the British Geological Survey, Sheet 22W and part of 21E (Scotland). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S022 S030 S022