The BGS Lexicon of Named Rock Units — Result Details

Laggan Member

Computer Code: LAGN Preferred Map Code: LAGN
Status Code: Full
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Fossiliferous mudstone with well-preserved graptolite fauna obtained from the enclosed lime-rich nodules.
Definition of Lower Boundary: Succeeds Benan Conglomerate; mudstone abruptly overlies coarse, pebble and boulder conglomerate.
Definition of Upper Boundary: Succeeded by the Doon Hill Conglomerate Member of the Balclatchie Formation; boundary defined by abrupt overlying pebble conglomerate.
Thickness: c.100m (estimate).
Geographical Limits: Girvan area, Scotland.
Parent Unit: Balclatchie Formation (BCH)
Previous Name(s): Limestones In Laggan Burn (-4745)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Laggan Burn, c.600m northwest of Dalfask Farm, Girvan. Ingham (in Fortey et al., 2000) 
Reference(s):
Bulman, O M B. 1945-1947. A monograph of the Caradoc (Balclatchie) graptolites from limestones in Laggan Burn, Ayrshire. Parts 1-3, xi + 78pp., 10pls. Monograph of the Palaeontographical Society, London. 
Fortey, R A, Harper, D A T, Ingham, J K, Owen, A W, Parkes, M A, Rushton, A W A and Woodcock, N H. 2000. A revised correlation of Ordovician rocks in the British Isles. Geological Society Special Report, No.24. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable