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

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Drive onto the A66, turn left then first right to Greta Bridge.
 
Drive onto the A66, turn left then first right to Greta Bridge.
  
=== Locality 5, Greta Bridge and Brignall [NZ 076 119]–[NZ 086 132] ===
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=== Locality 5, Greta Bridge and Brignall [NZ 076 119]–[NZ 086 132] ===
  
There is parking between the bridge and the Morritt Arms. Follow the River Greta upstream on the west bank to an exposure of the Five Yard Limestone [NZ 076 119], the lowest limestone seen in the western half of the Middleton Tyas Anticline. It is a grey, fine-grained, bioclastic limestone with a fauna of '''crinoid''' stems, '''corals''' and '''brachiopods''', gently dipping to the north. It forms a pavement at the river edge with the characteristic blocky pattern of the well-jointed Carboniferous limestones. Further downstream a brown, medium-grained, '''limonitic''' sandstone between the Five Yard and overlying Three Yard Limestones [NZ 078 124] is exposed in a river cliff. Return to the footpath and continue to the Scotchman's Stone (NZ 081 125), where the blue-grey, fine-grained, crinoidal Three Yard Limestone is exposed (better seen on the eastern bank). The Scotchman's Stone is a joint block of a brown, thick bedded, coarse-grained sandstone that has broken away from the cliff section seen above the eastern bank. It is seen again on the opposite bank at NZ 085 128. The top of this sandstone is approximately 8 m below the base of the Four Fathom Limestone which is not exposed. From the bridge looking north, the high ground is formed by the outcrop of the Great Limestone, which is seen in the next locality.
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There is parking between the bridge and the Morritt Arms. Follow the River Greta upstream on the west bank to an exposure of the Five Yard Limestone [NZ 076 119], the lowest limestone seen in the western half of the Middleton Tyas Anticline. It is a grey, fine-grained, bioclastic limestone with a fauna of '''crinoid''' stems, '''corals''' and '''brachiopods''', gently dipping to the north. It forms a pavement at the river edge with the characteristic blocky pattern of the well-jointed Carboniferous limestones. Further downstream a brown, medium-grained, '''limonitic''' sandstone between the Five Yard and overlying Three Yard Limestones [NZ 078 124] is exposed in a river cliff. Return to the footpath and continue to the Scotchman's Stone (NZ o81125), where the blue-grey, fine-grained, crinoidal Three Yard Limestone is exposed (better seen on the eastern bank). The Scotchman's Stone is a joint block of a brown, thick bedded, coarse-grained sandstone that has broken away from the cliff section seen above the eastern bank. It is seen again on the opposite bank at NZ 085128. The top of this sandstone is approximately 8 m below the base of the Four Fathom Limestone which is not exposed. From the bridge looking north, the high ground is formed by the outcrop of the Great Limestone, which is seen in the next locality.
  
 
Return across the A66 to the 'Meeting of the Waters'.
 
Return across the A66 to the 'Meeting of the Waters'.
  
=== Locality 6, 'Meeting of the Waters' [NZ 085 145] ===
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=== Locality 6, 'Meeting of the Waters' [NZ 085 145] ===
  
The metalled road to this locality is private but may be used as a footpath. Approaching the confluence with the River Tees, the River Greta has cut through the top 20 m of the east–west striking Great Limestone, and is generally flowing down the gentle northerly dip slope into the River Tees.
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The metalled road to this locality is private but may be used as a footpath. Approaching the confluence with the River Tees, the River Greta has cut through the top 20 m of the east–west striking Great Limestone, and is generally flowing down the gentle northerly dip slope into the River Tees.
  
 
Return to the A66, turn left and take the first left to Whorlton.
 
Return to the A66, turn left and take the first left to Whorlton.

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