The BGS Lexicon of Named Rock Units — Result Details

St John's Knap Sandstone Member

Computer Code: SJKS Preferred Map Code: SJKS
Status Code: Full
Age range: Lochkovian Age (DO) — Pragian Age (DP)
Lithological Description: Sandstone, pebbly sandstone and conglomerate.
Definition of Lower Boundary: Passes diachronously and conformably downwards and laterally to the south into the conglomerates of the Catterline Conglomerate Formation; taken at the point where sandstone becomes predominant in the upward sequence.
Definition of Upper Boundary: Passes diachronously and conformably upwards and laterally to the north into the Barras Conglomerate Member, taken at the point at which conglomerate becomes predominant.
Thickness: From 230 to 345m
Geographical Limits: Between Law of Lumgair (NO 8525 8180), and Moor of Auchendreich (NO 833 770).
Parent Unit: Catterline Conglomerate Formation (CATC)
Previous Name(s): St John's Knap Sandstone Formation (-3031)
Johnshaven Formation [Obsolete Name And Code: See CATC] (JNF)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  St. Johns Knap, near Roadside of Kinneff. 
Reference(s):
Carroll, S, 1994. Geology of the Inverbervie and Catterline district, 1:10 000 sheets NO87NW, NO87NE and NO87SW. British Geological Survey, Technical Report, WA/94/20. 
Armstrong, M and Paterson, I B, 1970. The Lower Old Red Sandstone of the Strathmore Region. Report of the Institute of Geological Sciences No.70/12 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S067