The BGS Lexicon of Named Rock Units — Result Details

Stockdale Farm Formation

Computer Code: STFA Preferred Map Code: StF
Status Code: Full
Age range: Tournaisian Stage (CT) — Chadian Substage (CI)
Lithological Description: A lower member comprises thinly interbedded laminated dolostones, dolomitic-siliciclastic siltstone, mudstone and laminated anhydrite. This is overlain by interbedded sandstone, siltstone, mudstone and thin limestone. The sandstones are arkosic, pale grey, fine-grained, micaceous and carbonaceous. Limestones are dark grey micrites with subordinate packstones and wackestones.The upper member comprises interbedded limestone, siltstone and mudstone, lithologically similar to the middle member, but lacking sandstones.
Definition of Lower Boundary: Not seen, but possibly an angular unconformity above Lower Palaeozoic sandstone, siltstone and mudstone.
Definition of Upper Boundary: A deeply fissured top surface marking a significant non-sequence, overlain by conglomerates of the Chapel House Limestone Formation and underlain by limestone, siltstone and mudstone of the Stockdale Farm Formation.
Thickness: At least 165m
Geographical Limits: The southern margin of the Askrigg Block, in the transition zone to the Craven sub-basin.
Parent Unit: Not Applicable (-)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Stockdale Farm (SD86SE/6, Cominco Borehole S7) from 170.00 to 309.4m, proves the upper and middle part of the formation. 
Type Section  Halsteads (SD86SW/6, Cominco Borehole S2), shows the basal 37m of the lower part of the formation. 
Reference(s):
Arthurton, R S, Johnson, E W and Mundy, D J C. 1988. Geology of the country around Settle. Memoir of the British Geological Survey, Sheet 60 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E060