Lawrence, D. J. D. 1990. Limestone Landscapes — a geodiversity audit and action plan for the Durham Magnesian Limestone Plateau. British Geological Survey open report OR/09/007.
Hepplewhites (Cold Knuckles) Quarry [NT 328 380]
Active Quarry
Tarmac
Excellent section from Yellow Sands Formation to Ford Formation. Fossil fish have been found here recently. Links with Old Quarrington quarry.
Proposed action Stockpile Marl Slate and maintain access for supervised parties. Consider open days. Possible viewing and interpretation point.
Existing designations None
Existing on site interpretation None
Major geodiversity interest The basal unconformity is sometimes revealed. Very good and accessible section in Yellow Sands Formation. Faulting can be seen in west face. The Marl Slate Formation has yielded good specimens of fossil fish. Overlying beds of Raisby and Ford formations well displayed in higher parts of faces.
Biodiversity interest None
Other heritage links None
Additional comment Used by Open University for geology Summer School. Marl Slate Formation fish can be collected from weathered material. The quarry is working towards the old face at Old Quarrington Quarry — it is highly desirable that arrangements are made to keep a representative section of the complete< sequence somewhere in the overall quarry.
Date of photography 2003 and 2004
Fossil fish photo copyright G. Easterbrook