Editing Cheviot — early Devonian volcanic rocks, granite and basement - an excursion

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[[File:YGS_NORTROCK_FIG_04_3.jpg|thumbnail|Figure 4.3 Upper Coquet Dale, near Alwinton. Geological lines from B.G.S. Sheet 5 The Cheviot.]]
 
[[File:YGS_NORTROCK_FIG_04_3.jpg|thumbnail|Figure 4.3 Upper Coquet Dale, near Alwinton. Geological lines from B.G.S. Sheet 5 The Cheviot.]]
  
'''Peter Allen''' British Geological Survey, Keyworth, Nottingham
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== 4 The Cheviot–early Devonian rocks, granite and basement ==
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Peter Allen British Geological Survey, Keyworth, Nottingham
  
 
== Purpose ==
 
== Purpose ==
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{{YGSLogistics}}
 
{{YGSLogistics}}
  
There are two excursions, each comfortably done in a day. The first is along Harthope Burn, the second in Upper Coquet Dale. Both are primarily along roads suitable for minibuses, but with some localities up to 4 km away from the road.
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There are two excursions, each comfortably done in a day. The first is along Harthope Burn, the second in Upper Coquet Dale. Both are primarily along roads suitable for minibuses, but with some localities up to 4 km away from the road.
  
Approach Harthope Burn either from Wooler or the A697 some 4 km south, following the signs to North Middleton. Access from Haugh Head on the A697 is not recommended because of a dangerous ford. Make for Middleton Hall, turning onto the single track road signposted to Langleeford. The road is mostly unfenced. It can be used only as far as Hawsen Burn [NT 9532 2252].
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Approach Harthope Burn either from Wooler or the A697 some 4 km south, following the signs to North Middleton. Access from Haugh Head on the A697 is not recommended because of a dangerous ford. Make for Middleton Hall, turning onto the single track road signposted to Langleeford. The road is mostly unfenced. It can be used only as far as Hawsen Burn [NT 9532 2252].
  
Reach upper Coquet Dale either from Alwinton [NT 9210 0630] or the A68 at Cottonshopeburn Foot [NT 7804 0157]. From the A68 to Makendon [NT 8036 0932] is a military road and access may be barred when the artillery range is in use (check with the Army at Otterburn). For geological convenience this excursion, which is on unfenced, single track public road, is described from west to east.
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Reach upper Coquet Dale either from Alwinton [NT 9210 0630] or the A68 at Cottonshopeburn Foot [NT 7804 0157]. From the A68 to Makendon [NT 8036 0932] is a military road and access may be barred when the artillery range is in use (check with the Army at Otterburn). For geological convenience this excursion, which is on unfenced, single track public road, is described from west to east.
  
 
Maps
 
Maps
  
O.S. 1:50 000 sheets 75 Berwick-upon-Tweed, 80 Cheviot Hills & Kielder Forest, 81 Alnwick & Morpeth; B.G.S. 1:50 000 Sheet 5 The Cheviot.
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O.S. 1:50 000 sheets 75 Berwick-upon-Tweed, 80 Cheviot Hills & Kielder Forest, 81 Alnwick & Morpeth; B.G.S. 1:50 000 Sheet 5 The Cheviot.
  
 
== Geological background ==
 
== Geological background ==

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