Editing Permian and Carboniferous rocks of Knaresborough - an excursion

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=== Locality 10 [SE 356 556] ===
 
=== Locality 10 [SE 356 556] ===
  
About 100 m north of Locality 9, the Grimbald Crag Fault crosses the River Nidd opposite the Priory and is marked by a prolific spring. At this locality the Brotherton Formation limestone and Roxby Formation (formerly called the Upper Marl) are thrown against the Cadeby Formation, the fault scarp forming a prominent feature which can be traced to the west.
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About too m north of Locality 9, the Grimbald Crag Fault crosses the River Nidd opposite the Priory and is marked by a prolific spring. At this locality the Brotherton Formation limestone and Roxby Formation (formerly called the Upper Marl) are thrown against the Cadeby Formation, the fault scarp forming a prominent feature which can be traced to the west.
  
 
=== Locality 11 [SE 352 560] ===
 
=== Locality 11 [SE 352 560] ===
  
North of the Grimbald Crag Fault, Calcutt Cricket Ground occupies a quarry excavated in the Sprotbrough Member of the Cadeby Formation. East of the quarry the Lower Plompton Grit is exposed in the river bed, while to the south and north the Edlington Formation overlies the dolomite of the Cadeby Formation. East of the Nidd, beneath Knaresborough, the Cadeby Formation is thick and its top rises to 75 m 0.D., but at Calcutt it is thin and the top only rises to 53 m. As the regional dip of the Permian rocks is to the east, the westward thinning of the Cadeby Formation at this point is clearly illustrated (see cross-section in [[:File:YGS_YORKROCK_FIG_13_01.jpg|Figure 13.1]]). Proceed along the riverside path to Low Bridge, a convenient place to break for lunch with pubs nearby.
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North of the Grimbald Crag Fault, Calcutt Cricket Ground occupies a quarry excavated in the Sprotbrough Member of the Cadeby Formation. East of the quarry the Lower Plompton Grit is exposed in the river bed, while to the south and north the Edlington Formation overlies the dolomite of the Cadeby Formation. East of the Nidd, beneath Knaresborough, the Cadeby Formation is thick and its top rises to 75 m 0.D., but at Calcutt it is thin and the top only rises to 53 m. As the regional dip of the Permian rocks is to the east, the westward thinning of the Cadeby Formation at this point is clearly illustrated (see cross-section in [[:File:YGS_YORKROCK_FIG_13_01.jpg|Figure 13.1]]). Proceed along the riverside path to Low Bridge, a convenient place to break for lunch with pubs nearby.
  
 
=== Locality 12 [SE 348 569] ===
 
=== Locality 12 [SE 348 569] ===
  
Cross the river at Low Bridge and head northwards on the east side of the Nidd. Below the castle the cliff section near the Weir, seen earlier from the opposite bank of the river, exposes the unconformity at the base of the Cadeby Formation. The 27  m high vertical face is not accessible. At road level 2–3 m of weathered Addlethorpe Grit is exposed with a fossilized tree-trunk present below an overhang about 1 m above ground level. The remaining 27 m of the cliff comprises a basal zone 6–7 m thick of reddish-buff sandy dolomite overlain by about 17 m of dolomite in large-scale cross-bedded units.
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Cross the river at Low Bridge and head northwards on the east side of the Nidd. Below the castle the cliff section near the Weir, seen earlier from the opposite bank of the river, exposes the unconformity at the base of the Cadeby Formation. The 27 m high vertical face is not accessible. At road level 2–3 m of weathered Addlethorpe Grit is exposed with a fossilized tree-trunk present below an overhang about i m above ground level. The remaining 27 m of the cliff comprises a basal zone 6–7 m thick of reddish-buff sandy dolomite overlain by about 17 m of dolomite in large-scale cross-bedded units.
  
 
=== Locality 13 [SE 349 569] ===
 
=== Locality 13 [SE 349 569] ===

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