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

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==== Locality 20, Hell Hole [SE 066 622] ====
 
==== Locality 20, Hell Hole [SE 066 622] ====
  
This large swallow hole is just one of a series which mark the junction between the top of the limestone and the base of the overlying Bowland Shale. Since the Bowland Shale is impermeable, run-off is concentrated at this boundary. The important marker horizon, the ''Girvanella ''Band, may be examined on the flat limestone slabs in the entrance to the hole. This '''algal''' band marks the junction between the Asbian and the overlying Brigantian and is very widespread throughout northern England.
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This large swallow hole is just one of a series which mark the junction between the top of the limestone and the base of the overlying Bowland Shale. Since the Bowland Shale is impermeable, run-off is concentrated at this boundary. The important marker horizon, the ''Girvanella ''Band, may be examined on the flat limestone slabs in the entrance to the hole. This algal band marks the junction between the Asbian and the overlying Brigantian and is very widespread throughout northern England.
  
 
Return to the track and walk to the parking place. Note the feature of Fancarl Crag to the northwest, formed of Grassington Grit which lies upon the Bowland Shale. The scale of the Skyreholme Anticline can be judged by now looking towards Simon's Seat to the southeast. Fancarl Crag and Simon's Seat both consist of Namurian grit (although not at precisely the same horizon), on opposite sides of the Skyreholme Anticline. The limestone of Trollers Gill is at the anticline's core. The parking place is on Bowland Shale, which is clearly considerably thinner here than in the Skipton Anticline. This shale also contains two prominent limestone bands, each of which produces a marked change in gradient on the road.
 
Return to the track and walk to the parking place. Note the feature of Fancarl Crag to the northwest, formed of Grassington Grit which lies upon the Bowland Shale. The scale of the Skyreholme Anticline can be judged by now looking towards Simon's Seat to the southeast. Fancarl Crag and Simon's Seat both consist of Namurian grit (although not at precisely the same horizon), on opposite sides of the Skyreholme Anticline. The limestone of Trollers Gill is at the anticline's core. The parking place is on Bowland Shale, which is clearly considerably thinner here than in the Skipton Anticline. This shale also contains two prominent limestone bands, each of which produces a marked change in gradient on the road.

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