Editing Carboniferous and Permian rocks in southern County Durham - an excursion

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=== Locality 11, old quarry at High Coniscliffe [NZ 2251 1525] ===
 
=== Locality 11, old quarry at High Coniscliffe [NZ 2251 1525] ===
  
There is limited parking at the entry gate [NZ 2253 1530] on the A67 near the church. The enigmatic section in the main face is in lagoonal beds of the Ford Formation and comprises two rock units that meet at a sharp sub-horizontal very uneven surface (relief c.2 m). The lower unit (up to 3.5 m thick) is of soft, porous, finely oolitic buff dolostone in regular beds mainly 0.1–0.3 m thick, of which some are planar cross-bedded; the upper unit (up to 5 m ) is generally massive finely crystalline pale grey hard limestone that bears faint hints of bedding (and ?cross-bedding) in a few patches. The massive unit has a reef-like appearance and it may be a lagoonal patch-reef, but samples of it have so far failed to reveal a diagnostic reef fauna. The limestone may be secondary ('dedolomite) and produced by the reaction between former dolostone and groundwater rich in dissolved calcium sulphate. Dome-shaped structures up to about 1.2 m across in a minor north face could be '''algal'''.
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There is limited parking at the entry gate [NZ 2253 1530] on the A67 near the church. The enigmatic section in the main face is in lagoonal beds of the Ford Formation and comprises two rock units that meet at a sharp sub-horizontal very uneven surface (relief c.2 m). The lower unit (up to 3.5 m thick) is of soft, porous, finely oolitic buff dolostone in regular beds mainly 0.1–0.3 m thick, of which some are planar cross-bedded; the upper unit (up to 5 m ) is generally massive finely crystalline pale grey hard limestone that bears faint hints of bedding (and ?cross-bedding) in a few patches. The massive unit has a reef-like appearance and it may be a lagoonal patch-reef, but samples of it have so far failed to reveal a diagnostic reef fauna. The limestone may be secondary ('dedolomite) and produced by the reaction between former dolostone and groundwater rich in dissolved calcium sulphate. Dome-shaped structures up to about 1.2 m across in a minor north face could be algal.
  
 
== [[Northumbrian rocks and landscape: a field guide#Glossary|Glossary]] ==
 
== [[Northumbrian rocks and landscape: a field guide#Glossary|Glossary]] ==

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