The BGS Lexicon of Named Rock Units — Result Details

Hill House Flags Member

Computer Code: HHF Preferred Map Code: notEntered
Status Code: Pending Upgrade
Age range: St David's Series (ED) — St David's Series (ED)
Lithological Description: Dark, flaggy sandstones, phosphatic and calcareous in places. This division appears to be partly erected on biostratigraphical grounds, and so little of it is exposed that its status has to be regarded as doubtful. Propose that it be retained as an informal term, with Member status regarded as provisional, until a fuller study of the divisions of the Upper Comley Sandstone Formation is undertaken.
Definition of Lower Boundary: Appears to overlie the greenish grey Quarry Ridge Shales (Upper Comley Sandstone Formation) conformably, but little is seen of the junction.
Definition of Upper Boundary: Conformably overlain by the Hill House Grits, also of the Upper Comley Sandstone Formation.
Thickness: 1m exposed.
Geographical Limits: Church Stretton area, Comley, Shropshire.
Parent Unit: Upper Comley Sandstone Formation (UCSS)
Previous Name(s): Hill House Flags (-2236)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Hill House Ridge, Comley, Shropshire. Cobbold, E S. 1909. 
Reference(s):
Cobbold, E S. 1909. On some excavations in the Cambrian rocks of Comley, Shropshire, 1907. Report of the British Association (for 1908), 231-242. 
Rushton, A W A. 1974. The Cambrian of Wales and England, 43-121 in Holland, C H (editor), The Cambrian of the British Isles, Norden and Spitzbergen (Lower Palaeozoic rocks of the world, 2). [London: John Wiley and Son.] 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable