Editing Carboniferous rocks of the Roman Wall and Haltwhistle Burn - an excursion

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==== Locality 2 ====
 
==== Locality 2 ====
  
Make a short detour at Twice Brewed [NY 751 668], turning north to Steel Rigg. From the car park just north of the wall [NY 751 677], walk 100 m from the southeast corner along the wall to the edge of the '''overflow channel''' and a superb view of the Whin escarpment, with its columnar '''jointing''', and Crag Lough in the middle distance ([[:File:YGS_NORTROCK_FIG_11_2.jpg|Figure 11.2]]).
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Make a short detour at Twice Brewed [NY 751 668], turning north to Steel Rigg. From the car park just north of the wall [NY 751 677], walk loo m from the southeast corner along the wall to the edge of the '''overflow channel''' and a superb view of the Whin escarpment, with its columnar '''jointing''', and Crag Lough in the middle distance ([[:File:YGS_NORTROCK_FIG_11_2.jpg|Figure 11.2]]).
  
Return to the Military Road, which over the next 2 km west has the dip slop of the Whin continuing on the north side but to the south the features are buried under till. They gradually emerge near the junction at NY 730 663 where quarries in the Four Fathom Limestone can be seen alongside the road and in the Great Limestone near the skyline; these features strengthen and the Four Fathom Limestone crosses the road at [NY 720 662]. To the south quarries and lime kilns indicate the position of the Great Limestone with further quarries in the sandstone above it.
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Return to the Military Road, which over the next 2 km west has the dip slop of the Whin continuing on the north side but to the south the features are buried under till. They gradually emerge near the junction at NY 730663 where quarries in the Four Fathom Limestone can be seen alongside the road and in the Great Limestone near the skyline; these features strengthen and the Four Fathom Limestone crosses the road at [NY 720 662]. To the south quarries and lime kilns indicate the position of the Great Limestone with further quarries in the sandstone above it.
  
Turn north at the Milecastle Inn [NY 716 660] to Cawfields. Immediately on the right is a good section of the Four Fathom Limestone exposed in an old quarry, while on a raised hillock on the left, between the road and Haltwhistle Burn, is the site of the fortlet that guarded this section of the Stanegate. Between the Four Fathom Limestone and the top surface of the Whin are the remains of old workings in coal below the Three Yard Limestone and '''siderite''' ironstone bands in shales in the same part of the succession. The most striking feature, however, is the vallum and mounds running along the base of the Whin feature. Continue to Cawfields quarry car park.
+
Turn north at the Milecastle Inn [NY 716 660] to Cawfields. Immediately on the right is a good section of the Four Fathom Limestone exposed in an old quarry, while on a raised hillock on the left, between the road and Haltwhistle Burn, is the site of the fortlet that guarded this section of the Stanegate. Between the Four Fathom Limestone and the top surface of the Whin are the remains of old workings in coal below the Three Yard Limestone and '''siderite''' ironstone bands in shales in the same part of the succession. The most striking feature, however, is the vallum and mounds running along the base of the Whin feature. Continue to Cawfields quarry car park.
  
 
==== Locality 3, Cawfields Quarry [NY 713 666] ====
 
==== Locality 3, Cawfields Quarry [NY 713 666] ====

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