The BGS Lexicon of Named Rock Units — Result Details

Main Algal Member

Computer Code: MAN Preferred Map Code: MALG
Status Code: Full
Age range: Arundian Substage (CJ) — Arundian Substage (CJ)
Lithological Description: Rhythmic alternations of limestone and mudstone with 14 well developed nodular algal horizons.
Definition of Lower Boundary: Main Algal One is conformable on Bewcastle Member (Lyne Formation) of Bewcastle.
Definition of Upper Boundary: Top of Main Algal Fourteen is conformable with overlying Lower Antiquatonia Bed of the Cambeck Member (Lyne Formation) of Bewcastle.
Thickness: 87m (Bewcastle).
Geographical Limits: Northumberland - Solway Basin. Bewcastle District (England Sheet 12).
Parent Unit: Lyne Formation (LYNE)
Previous Name(s): Main Algal Limestone Beds (-2933)
Main Algal (-2932)
Alternative Name(s): none recorded or not applicable
Type Section  Main Algal Member, Birky Cleuch, a tributary of the Kirk Beck, Bewcastle. Day, 1970. 
Day, J B W and others, 1970. Geology of the neighbourhood around Bewcastle. Memoir of the British Geological Survey, Sheet 12. (England and Wales). 
Leeder, M R. 1974. Lower Border Group (Tournaisian) fluvio-deltaic sedimentation and palaeogeography of the Northumberland Basin. Proceedings of the Yorkshire Geological Society, Vol.40, 129 - 180. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: