Editing Dinantian and Namurian rocks of Bolton Abbey and Trollers Gill - an excursion

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==== Locality 9 [SE 073 558] ====
 
==== Locality 9 [SE 073 558] ====
  
Return to the main path and continue upstream for 350 m to an outcrop of gritstone. This marks the position of a small fault striking northeast–southwest, which downthrows gritstone to the northwest. From this point to the Strid the route is over gritstone, the change from variably resistant Bowland Shale to uniformly resistant gritstone being recorded by a marked change in the characteristics of the river.
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Return to the main path and continue upstream for 350 m to an outcrop of gritstone. This marks the position of a small fault striking northeast–southwest, which downthrows gritstone to the northwest. From this point to the Strid the route is over gritstone, the change from variably resistant Bowland Shale to uniformly resistant gritstone being recorded by a marked change in the characteristics of the river.
  
 
==== Locality 10, The Strid [SE 064 565] ====
 
==== Locality 10, The Strid [SE 064 565] ====
  
Follow the path upstream to the Strid, a distance of approximately 1 km. At this famous locality, except in times of extreme flood, the entire River Wharfe descends through a series of large pot-holes which originally developed along a joint in the river bed and which have now merged to form a narrow, deep (c. 10 m) channel through which the river flows. Evidence of pot-holing abounds, including some large dry pot-holes on the abandoned margins of the river.
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Follow the path upstream to the Strid, a distance of approximately i km. At this famous locality, except in times of extreme flood, the entire River Wharfe descends through a series of large pot-holes which originally developed along a joint in the river bed and which have now merged to form a narrow, deep (c. 10 m) channel through which the river flows. Evidence of pot-holing abounds, including some large dry pot-holes on the abandoned margins of the river.
  
 
This is also an excellent locality at which to study the composition and sedimentary structure of the grit, but there should most definitely be ''no hammering.''
 
This is also an excellent locality at which to study the composition and sedimentary structure of the grit, but there should most definitely be ''no hammering.''
  
Follow the track up to the Strid car park, a distance of about 1 km, and then drive to the old school-house at Skyreholme. Note that the shortest route, via Barden bridge, is not suitable for large vehicles. The alternative route, via Burnsall, also includes a very narrow road between Burnsall and Appletreewick.
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Follow the track up to the Strid car park, a distance of about 1 km, and then drive to the old school-house at Skyreholme. Note that the shortest route, via Barden bridge, is not suitable for large vehicles. The alternative route, via Burnsall, also includes a very narrow road between Burnsall and Appletreewick.
  
 
=== The Trollers Gill Section ===
 
=== The Trollers Gill Section ===

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