Editing Permian and Carboniferous rocks of Knaresborough - an excursion

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=== Locality 1 [SE 3475 5685] ===
 
=== Locality 1 [SE 3475 5685] ===
  
Starting at Old Mother Shipton's car park, take the Long Walk to the Weir [SE 3475 5685]; here Carboniferous sandstone (Addlethorpe Grit) is present in the river, and the sub-Permian unconformity is visible in the cliffs below the Walk. About 12 m of dolomite are exposed, overlain by red siltstones of the Edlington Formation. On the opposite bank of the river the Addlethorpe Grit and overlying Cadeby Formation form a sheer cliff; the unconformity at the base of the Permian sequence is clearly visible.
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Starting at Old Mother Shipton's car park, take the Long Walk to the Weir [SE 3475 5685]; here Carboniferous sandstone (Addlethorpe Grit) is present in the river, and the sub-Permian unconformity is visible in the cliffs below the Walk. About 12 m of dolomite are exposed, overlain by red siltstones of the Edlington Formation. On the opposite bank of the river the Addlethorpe Grit and overlying Cadeby Formation form a sheer cliff; the unconformity at the base of the Permian sequence is clearly visible.
  
 
=== Locality 2 [SE 348 565] ===
 
=== Locality 2 [SE 348 565] ===
  
Proceed southwards to the Dropping Well. Here there are several magnificent '''tufa''' screens produced by the carbonate- and sulphate-rich waters of the spring. The Dropping Well spring emanates from the dolomite of the Cadeby Formation, but includes dissolved sulphates derived from the gypsum of the overlying Edlington Formation. The carbonate is readily deposited from the water forming the Dropping Well screens and petrifying objects placed in its path. Mother Shipton's Cave, just north of the Dropping Well, is situated below an ancient tufa screen. Tradition says that the notorious sibyl of the North, Mother Shipton, was born near this well in the year 1488. Leave Old Mother Shipton's by the exit at Low Bridge, cross to the east side of the river and walk south about 50 m.
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Proceed southwards to the Dropping Well. Here there are several magnificent tufa screens produced by the carbonate- and sulphate-rich waters of the spring. The Dropping Well spring emanates from the dolomite of the Cadeby Formation, but includes dissolved sulphates derived from the gypsum of the overlying Edlington Formation. The carbonate is readily deposited from the water forming the Dropping Well screens and petrifying objects placed in its path. Mother Shipton's Cave, just north of the Dropping Well, is situated below an ancient tufa screen. Tradition says that the notorious sibyl of the North, Mother Shipton, was born near this well in the year 1488. Leave Old Mother Shipton's by the exit at Low Bridge, cross to the east side of the river and walk south about 50 m.
  
 
=== Locality 3 [SE 351 565] ===
 
=== Locality 3 [SE 351 565] ===
  
At the entrance to Bunker's Hill Quarry (Low Bridge Caravan Park) massive, cross-bedded oolites of the Cadeby Formation are exposed in the cliff along to the House in the Rock and the Chapel of Our Lady of the Crag which may be visited upon payment of an entrance fee. The chapel was formerly known as St Robert's Chapel after the monk who built it (see Locality 7 for further details). To visit the rock faces in Bunker's Hill Quarry [SE 3515 5655] permission must be sought in advance from the caravan site owner (see Logistics). Near the Chapel of Our Lady of the Crag the cliffs show rows of post holes from the roofs of houses occupied by weavers up to about 1840. Hereabouts the rock faces show sections of oolitic dolomite which occurs in massive cross-bedded units with sets up to 18 m high; these belong to the Sprotbrough Member of the Cadeby Formation. These units represent massive subaqueous oolite sand waves. There is general westward thinning of the sequence from here to Calcutt (see cross-section in [[:File:YGS_YORKROCK_FIG_13_01.jpg|Figure 13.1]]).
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At the entrance to Bunker's Hill Quarry (Low Bridge Caravan Park) massive, cross-bedded oolites of the Cadeby Formation are exposed in the cliff along to the House in the Rock and the Chapel of Our Lady of the Crag which may be visited upon payment of an entrance fee. The chapel was formerly known as St Robert's Chapel after the monk who built it (see Locality 7 for further details). To visit the rock faces in Bunker's Hill Quarry [SE 3515 5655] permission must be sought in advance from the caravan site owner (see Logistics). Near the Chapel of Our Lady of the Crag the cliffs show rows of post holes from the roofs of houses occupied by weavers up to about 1840. Hereabouts the rock faces show sections of oolitic dolomite which occurs in massive cross-bedded units with sets up to 18 m high; these belong to the Sprotbrough Member of the Cadeby Formation. These units represent massive subaqueous oolite sand waves. There is general westward thinning of the sequence from here to Calcutt (see cross-section in [[:File:YGS_YORKROCK_FIG_13_01.jpg|Figure 13.1]]).
  
 
=== Locality 4 [SE 355 559] ===
 
=== Locality 4 [SE 355 559] ===

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