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

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In Leeshall Quarry, on the west bank, two sandstones are separated by a 25 cm coal, the same as that at the base of Jackdaw Crags, underlain by '''seatearth''' 2 m thick. The sequence reflects the build up of the Carboniferous delta top to water level allowing the growth of plants and the formation of peat. Downstream of Leeshall Quarry the path returns to the east bank via the old railway bridge in which the narrow gauge tracks are still embedded. Continue downstream to the picnic place where an excellent dipping top bedding surface of the Upper Leeshall Quarry Sandstone can be seen in the stream. Stay close to the edge of the stream where the Oakwood Limestone crops out just above water level on the west bank. The exposure continues for 20 m downstream to just above the wooden footbridge. The 2–3 m thick limestone is impure with a high clay content and is a significant marker horizon in this part of the succession dominated by sandstone and shale.
 
In Leeshall Quarry, on the west bank, two sandstones are separated by a 25 cm coal, the same as that at the base of Jackdaw Crags, underlain by '''seatearth''' 2 m thick. The sequence reflects the build up of the Carboniferous delta top to water level allowing the growth of plants and the formation of peat. Downstream of Leeshall Quarry the path returns to the east bank via the old railway bridge in which the narrow gauge tracks are still embedded. Continue downstream to the picnic place where an excellent dipping top bedding surface of the Upper Leeshall Quarry Sandstone can be seen in the stream. Stay close to the edge of the stream where the Oakwood Limestone crops out just above water level on the west bank. The exposure continues for 20 m downstream to just above the wooden footbridge. The 2–3 m thick limestone is impure with a high clay content and is a significant marker horizon in this part of the succession dominated by sandstone and shale.
  
==== Locality 7 [NY 708 649] ====
+
==== Locality 7 [NY 708 649] ====
  
 
Downstream on the east bank, sandstone, underlain by the shale above the Oakwood Limestone, forms the main face of a large quarry, set back from and running parallel to the burn. Nearby are the remains of another colliery, a drift into the base of the cliff marked by some stone packing and a concrete tunnel from which issues a flow of water, white with alum. The colliery initially worked a thin coal above the Oakwood Limestone but later it mainly mined fireclay for the pottery, recently closed, a few metres ahead. The remains of the kilns and the large sandstone wheels used to grind up the clay are still in the yard and glazed pipes can be found.
 
Downstream on the east bank, sandstone, underlain by the shale above the Oakwood Limestone, forms the main face of a large quarry, set back from and running parallel to the burn. Nearby are the remains of another colliery, a drift into the base of the cliff marked by some stone packing and a concrete tunnel from which issues a flow of water, white with alum. The colliery initially worked a thin coal above the Oakwood Limestone but later it mainly mined fireclay for the pottery, recently closed, a few metres ahead. The remains of the kilns and the large sandstone wheels used to grind up the clay are still in the yard and glazed pipes can be found.
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{{EWwalks}}
 
{{EWwalks}}
  
[[Category:Northumbrian rocks and landscape: a field guide ]]
 
 
[[Category:7. Northern England]]
 
[[Category:7. Northern England]]

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