Editing Upper Carboniferous of the Halifax area - an excursion

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=== Locality 4, Woodside Quarry [SE 099 209] ===
 
=== Locality 4, Woodside Quarry [SE 099 209] ===
  
Easiest access to the quarry is from Woodlands Lane, off the B61 12 Holywell Green Road. The Rough Rock exposed in the quarry face consists of braided river sandbodies showing '''tectonically''' induced deformation features, and occurs at about the same stratigraphic level as the outcrop in Greetland Quarry. Good views of Greetland Quarry and especially the Elland Road cut section can he seen from this locality. The outcrop exposed in the quarry face is up to 13 m high and can be traced laterally for some 150 m. The lower part of the outcrop consists of a coarse-grained, plant-rich channel sandstone with low-angle trough cross-stratification and rare solitary planar sets, deposited by palaeocurrents flowing south-southwest. The top of the sandstone is characterized by a laterally persistent 1.5 m thick zone of deformed cross-stratification ([[:File:YGS_YORKROCK_FIG_09_02.jpg|Figure 9.2]]c) showing local flexuring of foresets, oversteepened foresets, overturned and recumbently folded foresets, and convolute foresets. The thickness and lateral persistence of this unit suggests that deformation may be related to contemporaneous tectonic activity.
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Easiest access to the quarry is from Woodlands Lane, off the B61 12 Holywell Green Road. The Rough Rock exposed in the quarry face consists of braided river sandbodies showing tectonically induced deformation features, and occurs at about the same stratigraphic level as the outcrop in Greetland Quarry. Good views of Greetland Quarry and especially the Elland Road cut section can he seen from this locality. The outcrop exposed in the quarry face is up to 13 m high and can be traced laterally for some 150 m. The lower part of the outcrop consists of a coarse-grained, plant-rich channel sandstone with low-angle trough cross-stratification and rare solitary planar sets, deposited by palaeocurrents flowing south-southwest. The top of the sandstone is characterized by a laterally persistent 1.5 m thick zone of deformed cross-stratification ([[:File:YGS_YORKROCK_FIG_09_02.jpg|Figure 9.2]]c) showing local flexuring of foresets, oversteepened foresets, overturned and recumbently folded foresets, and convolute foresets. The thickness and lateral persistence of this unit suggests that deformation may be related to contemporaneous tectonic activity.
  
  
The lower sandstone is overlain by a much coarser-grained, erosively based channel sandbody downcutting to the southwest ([[:File:YGS_YORKROCK_FIG_09_02.jpg|Figure 9.2]]c). Concentrated along the erosion surface are granules and small pebbles of '''quartz''', and shale and siltstone '''intraclasts''' and lenses, together with abundant plant material including well-preserved ''Calamites ''stems. Internally the sandstone is structured by trough cross-stratification, except at the southwestern end where it contains a 2 m thick bed of ripple cross-laminated fine sandstone with rare small trough cross-stratification ([[:File:YGS_YORKROCK_FIG_09_02.jpg|Figure 9.2]]c).
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The lower sandstone is overlain by a much coarser-grained, erosively based channel sandbody downcutting to the southwest ([[:File:YGS_YORKROCK_FIG_09_02.jpg|Figure 9.2]]c). Concentrated along the erosion surface are granules and small pebbles of quartz, and shale and siltstone intraclasts and lenses, together with abundant plant material including well-preserved ''Calamites ''stems. Internally the sandstone is structured by trough cross-stratification, except at the southwestern end where it contains a 2 m thick bed of ripple cross-laminated fine sandstone with rare small trough cross-stratification ([[:File:YGS_YORKROCK_FIG_09_02.jpg|Figure 9.2]]c).
  
 
=== Locality 5, Upper Elland Edge [SE 118 204] ===
 
=== Locality 5, Upper Elland Edge [SE 118 204] ===

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