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

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Downstream, beyond lime kilns on both banks, the basal section of the sandstone above the Great Limestone is exposed in the east bank. It is thin bedded and shows fine detail of sedimentary structures picked out by severe wind erosion in its exposed position. Around the next bend are the remains of the colliery which worked the Little Limestone Coal; the chimney and engine block are still standing. Fragments of the coal can be found and the overlying Little Limestone, rich in bryozoa, is exposed in the hillside behind the chimney; there is a smaller exposure downstream in the west bank. The Little Limestone is rarely exposed, since it is only 3–4 m thick.
 
Downstream, beyond lime kilns on both banks, the basal section of the sandstone above the Great Limestone is exposed in the east bank. It is thin bedded and shows fine detail of sedimentary structures picked out by severe wind erosion in its exposed position. Around the next bend are the remains of the colliery which worked the Little Limestone Coal; the chimney and engine block are still standing. Fragments of the coal can be found and the overlying Little Limestone, rich in bryozoa, is exposed in the hillside behind the chimney; there is a smaller exposure downstream in the west bank. The Little Limestone is rarely exposed, since it is only 3–4 m thick.
  
==== Locality 5 [NY 709 655] ====
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==== Locality 5 [NY 709 655] ====
  
 
Cross to the west bank by the footbridge. South dipping interbedded massive sandstones and shales are exposed in the banks, with two of numerous quarries in the sandstones adjacent to the footbridge. Apparent changes in the dip of the sandstones downstream, particularly well seen at Jackdaw Crags where the massive sandstone in the east bank, underlain by a thin coal, appears to be synclinal, are due to the frequent changes in stream direction. The dip is constant. Stream erosion across the shale/ sandstone alternations has produced a very sinuous course.
 
Cross to the west bank by the footbridge. South dipping interbedded massive sandstones and shales are exposed in the banks, with two of numerous quarries in the sandstones adjacent to the footbridge. Apparent changes in the dip of the sandstones downstream, particularly well seen at Jackdaw Crags where the massive sandstone in the east bank, underlain by a thin coal, appears to be synclinal, are due to the frequent changes in stream direction. The dip is constant. Stream erosion across the shale/ sandstone alternations has produced a very sinuous course.
  
==== Locality 6 [NY 707 651] ====
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==== Locality 6 [NY 707 651] ====
  
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.
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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.
  
 
==== Locality 7 [NY 708 649] ====
 
==== Locality 7 [NY 708 649] ====

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