Editing Carboniferous and Permian rocks in southern County Durham - an excursion

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Return to the vehicle, drive south through Cockfield and take the A688 via Staindrop to Barnard Castle.
 
Return to the vehicle, drive south through Cockfield and take the A688 via Staindrop to Barnard Castle.
  
=== Locality 3, Barnard Castle [NZ 053 159]–[NZ 048 165] ===
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=== Locality 3, Barnard Castle [NZ 053 159]–[NZ 048 165] ===
  
There is ample free car parking on the Demesnes [NZ 052 161], on the north bank of the River Tees. From the footpath on the south bank, reach the riverside near the mill where a traverse through Yoredale cycles of the early Namurian can be examined ([[:File:YGS_NORTROCK_FIG_17_3.jpg|Figure 17.3]]). The waterfall at the mill is formed by the dark-grey, thin-beddded, fine-grained Bottom Little Limestone (2.5 m) dipping 10° north. The 9 m shale with limestone ribs between the Bottom and Top Little Limestones is exposed between Demesnes and Thorngate Mills. Cross the footbridge to where the Top Little Limestone (5 m) can be seen on the north bank upstream of Thorngate Wynd [NZ 048 161] forming a natural ledge across the River Tees. The overlying shale (6 m), which is poorly exposed, is capped by the Ten Fathom Grit (9 m) and can be seen under the County Bridge. This is succeeded by the Bottom (11 m) and Top (7 m) Crag Limestones with intervening shales; the castle stands on this sequence.
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There is ample free car parking on the Demesnes [NZ 052 161], on the north bank of the River Tees. From the footpath on the south bank, reach the riverside near the mill where a traverse through Yoredale cycles of the early Namurian can be examined ([[:File:YGS_NORTROCK_FIG_17_3.jpg|Figure 17.3]]). The waterfall at the mill is formed by the dark-grey, thin-beddded, fine-grained Bottom Little Limestone (2.5 m) dipping to° north. The g m shale with limestone ribs between the Bottom and Top Little Limestones is exposed between Demesnes and Thorngate Mills. Cross the footbridge to where the Top Little Limestone (5 m) can be seen on the north bank upstream of Thorngate Wynd [NZ 048 161] forming a natural ledge across the River Tees. The overlying shale (6 m), which is poorly exposed, is capped by the Ten Fathom Grit (9 m) and can be seen under the County Bridge. This is succeeded by the Bottom (1 1 m) and Top (7 m) Crag Limestones with intervening shales; the castle stands on this sequence.
  
 
Return to the vehicle and from the market cross in Barnard Castle, take the minor road towards Whorlton, turning off to Egglestone Abbey.
 
Return to the vehicle and from the market cross in Barnard Castle, take the minor road towards Whorlton, turning off to Egglestone Abbey.
  
=== Locality 4, Egglestone Abbey [NZ 066 149] ===
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=== Locality 4, Egglestone Abbey [NZ 066 149] ===
  
 
Park just before the Abbey Bridge under which the River Tees has cut a gorge in the grey, massively bedded, '''bioclastic''' Great Limestone which marks the base of the Namurian. Upstream, the soft overlying beds are covered until, on the northern side and set back from the river bank, the White Hazle Sandstone forms a cliff. The overlying Bottom Little Limestone is not seen. The siltstones, shales and thin Coal Sills sandstones between the Great Limestone and the White Hazle Sandstone are exposed further upstream in the northern bank of the river.
 
Park just before the Abbey Bridge under which the River Tees has cut a gorge in the grey, massively bedded, '''bioclastic''' Great Limestone which marks the base of the Namurian. Upstream, the soft overlying beds are covered until, on the northern side and set back from the river bank, the White Hazle Sandstone forms a cliff. The overlying Bottom Little Limestone is not seen. The siltstones, shales and thin Coal Sills sandstones between the Great Limestone and the White Hazle Sandstone are exposed further upstream in the northern bank of the river.

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