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

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== Geological background ==
 
== Geological background ==
  
The Carboniferous sequence of the Craven Basin is conspicuously thicker than that to the north of the North Craven Fault, and its base is not seen. In contrast to equivalent rocks to the north, these rocks were '''folded''' and faulted during '''Variscan''' times into a series of anticlines and synclines which '''strike''' and '''plunge''' towards the northeast. Bolton Abbey lies on the southeastern flank of a large, plunging anticline, the Skipton Anticline ([[:File:YGS_YORKROCK_FIG_06_01A.jpg|Figure 6.1a]], [[:File:YGS_YORKROCK_FIG_06_01B.jpg|Figure 6.1b]]), which is broader and structurally more complex to the west. The first half of the route crosses this anticline and ends on the axis of the adjacent Barden Syncline, covering rocks ranging in age from mid-Dinantian [Skibeden Shale) to early Namurian [Skipton Moor Grit = Grassington Grit). The second half of the excursion crosses the Skyreholme Anticline and is primarily within late Dinantian limestones.
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The Carboniferous sequence of the Craven Basin is conspicuously thicker than that to the north of the North Craven Fault, and its base is not seen. In contrast to equivalent rocks to the north, these rocks were folded and faulted during Variscan times into a series of anticlines and synclines which strike and plunge towards the northeast. Bolton Abbey lies on the southeastern flank of a large, plunging anticline, the Skipton Anticline ([[:File:YGS_YORKROCK_FIG_06_01A.jpg|Figure 6.1a]], [[:File:YGS_YORKROCK_FIG_06_01B.jpg|Figure 6.1b]]), which is broader and structurally more complex to the west. The first half of the route crosses this anticline and ends on the axis of the adjacent Barden Syncline, covering rocks ranging in age from mid-Dinantian [Skibeden Shale) to early Namurian [Skipton Moor Grit = Grassington Grit). The second half of the excursion crosses the Skyreholme Anticline and is primarily within late Dinantian limestones.
  
Folding occurred on two scales. The major anticlines and syncline are generally too large to be seen at individual locations, but small-scale '''disharmonic''' folds, within the Bowland Shales, can be examined in both horizontal and vertical section. Faulting is simple and also strikes to the northeast. Those faults within the limestones of the Skyreholme Anticline tend to be mineralized.
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Folding occurred on two scales. The major anticlines and syncline are generally too large to be seen at individual locations, but small-scale disharmonic folds, within the Bowland Shales, can be examined in both horizontal and vertical section. Faulting is simple and also strikes to the northeast. Those faults within the limestones of the Skyreholme Anticline tend to be mineralized.
  
 
== Excursion details ==
 
== Excursion details ==
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=== The Bolton Abbey Section ===
 
=== The Bolton Abbey Section ===
  
Take the gateway into the Bolton Abbey grounds at the 'hole-in-the-wall' and follow the footpath towards the footbridge.
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Take the gateway into the Bolton Abbey grounds at the 'hole-in-thewall' and follow the footpath towards the footbridge.
  
 
==== Locality 1 [SE 075 541] ====
 
==== Locality 1 [SE 075 541] ====

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