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

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==== Locality 18 [SE 066 621] ====
 
==== Locality 18 [SE 066 621] ====
  
Walk up the valley, cross the stile and then examine the old workings at a disused mine on the left (Gill's Head Mine or Gill Heads Mine). This mine was the largest in the vicinity and was worked sporadically until recently. The width of the fault zone represents a major fracture and the presence of horizontal '''slickensides''' indicates that the most recent movement has been in a horizontal direction. '''''This area is extremely dangerous and the old workings must on no account be entered.''''' This major fracture does not appear on the opposite side of the valley, indicating that it must be displaced by a second fault, which runs up the valley floor. The dip of the limestone is to the northwest, i.e. we are here on the northwestern limb of the Skyreholme Anticline.
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Walk up the valley, cross the stile and then examine the old workings at a disused mine on the left (Gill's Head Mine or Gill Heads Mine). This mine was the largest in the vicinity and was worked sporadically until recently. The width of the fault zone represents a major fracture and the presence of horizontal slickensides indicates that the most recent movement has been in a horizontal direction. '''''This area is extremely dangerous and the old workings must on no account be entered.''''' This major fracture does not appear on the opposite side of the valley, indicating that it must be displaced by a second fault, which runs up the valley floor. The dip of the limestone is to the northwest, i.e. we are here on the northwestern limb of the Skyreholme Anticline.
  
 
==== Locality 19 [SE 068 621] ====
 
==== Locality 19 [SE 068 621] ====
  
Continue up the track until it passes through a small cutting. Here the track follows the line of a small fault through the limestone escarpment, and affords an excellent opportunity to examine two different '''facies''' of Asbian limestone. On the right (east side) the limestones contain colonial '''corals''', whilst on the left (west side) there are abundant productid '''brachiopods'''.
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Continue up the track until it passes through a small cutting. Here the track follows the line of a small fault through the limestone escarpment, and affords an excellent opportunity to examine two different facies of Asbian limestone. On the right (east side) the limestones contain colonial corals, whilst on the left (west side) there are abundant productid brachiopods.
  
 
==== Locality 20, Hell Hole [SE 066 622] ====
 
==== Locality 20, Hell Hole [SE 066 622] ====

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