Editing Geology and landscape of Upper Teesdale - an excursion

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Return to the vehicle and leave Middleton-in-Teesdale on the B6277 for Bowlees.
 
Return to the vehicle and leave Middleton-in-Teesdale on the B6277 for Bowlees.
  
=== Locality 6, Bowlees Picnic site [NY 907 283] ===
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=== Locality 6, Bowlees Picnic site [NY 907 283] ===
  
Around the old limestone quarry [NY 908 284] there is a wealth of geological detail (summarized on [[:File:YGS_NORTROCK_FIG_16_1.jpg|Figure 16.1]]b) which requires careful observation.
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Around the old limestone quarry [NY 908 284] there is a wealth of geological detail (summarized on [[:File:YGS_NORTROCK_FIG_16_1.jpg|Figure 16.1]]b) which requires careful observation.
  
Walk upstream on the well-made path from the quarry. Above the quarry fault waterfall, Bow Lee Beck runs over the '''cross-bedded''' and channel fill sandstones of the Scar Limestone Cyclothem the top of which is at Gibson's Cave [NY 910 287] where the limestones of the succeeding Five Yard Limestone Cyclothem form the lip of the waterfall.
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Walk upstream on the well-made path from the quarry. Above the quarry fault waterfall, Bow Lee Beck runs over the '''cross-bedded''' and channel fill sandstones of the Scar Limestone Cyclothem the top of which is at Gibson's Cave [NY 910 287] where the limestones of the succeeding Five Yard Limestone Cyclothem form the lip of the waterfall.
  
Leave the picnic area and walk eastwards on the B6277 for 0.6 km before taking the footpath southwest to the River Tees ([[:File:YGS_NORTROCK_FIG_16_2.jpg|Figure 16.2]]).
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Leave the picnic area and walk eastwards on the B6277 for 0.6 km before taking the footpath southwest to the River Tees ([[:File:YGS_NORTROCK_FIG_16_2.jpg|Figure 16.2]]).
  
=== Locality 7, Scoberry Bridge [NY 910 273] ===
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=== Locality 7, Scoberry Bridge [NY 910 273] ===
  
Here the Cockleshell Limestone is exposed with the brachiopod ''Gigantoproductus ''and compound corals (do not hammer this locality). Cross the bridge and walk upstream on the Pennine Way. The gentle downstream dip brings in successively lower strata of the Single Post Limestone Cyclothem and into the top of the Tyne Bottom Limestone Cyclothem. Note the waste heaps from Wynch Mine trials into the Single Post Limestone (iron and zinc replacement ores) to the southwest side of the path some 300–550 m upstream from the bridge (Dunham 1990).
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Here the Cockleshell Limestone is exposed with the brachiopod ''Gigantoproductus ''and compound corals (do not hammer this locality). Cross the bridge and walk upstream on the Pennine Way. The gentle downstream dip brings in successively lower strata of the Single Post Limestone Cyclothem and into the top of the Tyne Bottom Limestone Cyclothem. Note the waste heaps from Wynch Mine trials into the Single Post Limestone (iron and zinc replacement ores) to the southwest side of the path some 300–550 m upstream from the bridge (Dunham 1990).
  
The River Tees changes its character some 200 m upstream from the bridge, caused by the exposure of the top margin of the Whin Sill. The sill has been injected into the sandstones of the Tyne Bottom Limestone Cyclothem and now forms the bed of the River Tees for 1.7 km upstream to Holwick Head Bridge [NY 889 283]. The indurate nature of the upper margin of the Whin Sill causes the river to flow over a series of rapids, small waterfalls and through small sharply defined valleys.
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The River Tees changes its character some 200 m upstream from the bridge, caused by the exposure of the top margin of the Whin Sill. The sill has been injected into the sandstones of the Tyne Bottom Limestone Cyclothem and now forms the bed of the River Tees for 1.7 km upstream to Holwick Head Bridge [NY 889 283]. The indurate nature of the upper margin of the Whin Sill causes the river to flow over a series of rapids, small waterfalls and through small sharply defined valleys.
  
 
=== Locality 8 [NY 904 278] ===
 
=== Locality 8 [NY 904 278] ===

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