The BGS Lexicon of Named Rock Units — Result Details

Buckbanks Sandstone Member

Computer Code: BNKS Preferred Map Code: BkS
Status Code: Full
Age range: Chadian Substage (CI) — Chadian Substage (CI)
Lithological Description: A dark grey, brown weathered, massive, thick-to thin-bedded, fine-to medium-grained, calcareous, quartzitic, bioclastic (crinoid and brachiopod debris), finely micaceous sandstone, interbeddedwith thin, dark grey, calcareous, laminated mudstones and siltstones.
Definition of Lower Boundary: The base taken at the base of the first sandstone bed above laminated calcisiltites and mudstones of the Hodder Mudstone Formation (undifferentiated).
Definition of Upper Boundary: Taken at the passage of sandstone into the overlying laminated mudstones and thin-bedded calcisiltites of the Hodder Mudstone Formation (undifferentiated).
Thickness: Maximum thickness of 11.5 m in the Thornley Anticline.
Geographical Limits: The member is present in the western part of the Craven Basin, in the western closure of the Whitewell Anticline (SD 64 47) and the northern limb of the Clitheroe (SD 75 45), Thornley (SD 62 40) and Throstle Nest (SD 63 44) anticlines.
Parent Unit: Hodder Mudstone Formation (HOM)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Leagram Brook, on the west bank of the gorge (SD 6380 4435), 1.9 km ENE of Chipping Parish Church: base of the member is exposed; the top of the member is exposed upstream at (SD 6355 4472). Riley, 1990. 
Reference(s):
Riley N J. 1990. Stratigraphy of the Worston Shale Group (Dinantian) Craven Basin, north-west England. Proceedings of the Yorkshire Geological Society, Vol. 48, 163-187. 
Aitkenhead, N, Bridge, D M, Riley, N J and Kimbell, S F. 1992. Geology of the country around Garstang. Memoir of the British Geological Survey, Sheet 67 (England and Wales) 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E067 E068