Editing Geology and landscape of Upper Teesdale - an excursion

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This locality may also be approached from the public car park and picnic site at High Force [NY 886 287].
 
This locality may also be approached from the public car park and picnic site at High Force [NY 886 287].
  
=== Locality 11, High Force [NY 881 284] ===
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=== Locality 11, High Force [NY 881 284] ===
  
 
Park as above and take the woodland walks and paths maintained by the Raby Estate to the waterfall. This approach will allow you to see at close hand the bottom section of the Whin Sill where the quartz dolerite magma has been injected into the sandstones of the Tyne Bottom Limestone Cyclothem (again the bottom contact of the sill has a chilled tachylitic margin). The disposition of the rock types viewed at this classic locality can be seen in [[:File:YGS_NORTROCK_FIG_16_3.jpg|Figure 16.3]].
 
Park as above and take the woodland walks and paths maintained by the Raby Estate to the waterfall. This approach will allow you to see at close hand the bottom section of the Whin Sill where the quartz dolerite magma has been injected into the sandstones of the Tyne Bottom Limestone Cyclothem (again the bottom contact of the sill has a chilled tachylitic margin). The disposition of the rock types viewed at this classic locality can be seen in [[:File:YGS_NORTROCK_FIG_16_3.jpg|Figure 16.3]].
  
Continuing upstream on the west bank from Holwick Head Bridge, the path ascends a steep slope to a position about halfway up the Whin Sill intrusion, some 73 m thick in this area. The well defined path passes through preserved areas of juniper scrub, remnant areas of woody plant colonisation left after the last, Devensian, glaciation. There are several places where '''''with extreme caution''' ''High Force can be viewed from the rim of the gorge.
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Continuing upstream on the west bank from Holwick Head Bridge, the path ascends a steep slope to a position about halfway up the Whin Sill intrusion, some 73 m thick in this area. The well defined path passes through preserved areas of juniper scrub, remnant areas of woody plant colonisation left after the last, Devensian, glaciation. There are several places where '''''with extreme caution''' ''High Force can be viewed from the rim of the gorge.
  
=== Locality 12, Top of High Force [NY 880 284] ===
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=== Locality 12, Top of High Force [NY 880 284] ===
  
 
Views of the waterfall and the gorge beyond are spectacular and '''''dangerous'''. ''Flash floods generated by summer storms in the Pennines often surprise the unwary at this locality.
 
Views of the waterfall and the gorge beyond are spectacular and '''''dangerous'''. ''Flash floods generated by summer storms in the Pennines often surprise the unwary at this locality.
  
Following the Pennine Way upstream, Bleabeck Force is seen to cascade over the Whin Sill on the south side of the valley [NY 875 278] and on the north side of the Tees there is the active Force Garth Quarry. Here almost the whole thickness of the Whin Sill (often showing working faces with excellent columnar jointing) is worked for roadstone.
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Following the Pennine Way upstream, Bleabeck Force is seen to cascade over the Whin Sill on the south side of the valley [NY 875 278] and on the north side of the Tees there is the active Force Garth Quarry. Here almost the whole thickness of the Whin Sill (often showing working faces with excellent columnar jointing) is worked for roads tone.
  
 
The low and ill-drained ground around Pasture Foot ([[:File:YGS_NORTROCK_FIG_16_2.jpg|Figure 16.2]]) is part of a pre-glacial buried channel now partly choked by till.
 
The low and ill-drained ground around Pasture Foot ([[:File:YGS_NORTROCK_FIG_16_2.jpg|Figure 16.2]]) is part of a pre-glacial buried channel now partly choked by till.

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