Editing Carboniferous rocks of upper Nidderdale - an excursion

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=== Locality 5, Carle Side Quarries [SE 063 776] ===
 
=== Locality 5, Carle Side Quarries [SE 063 776] ===
  
Walk across the dam to the north side and ascend the old incline to Carle Side Quarries (access restricted to August till February inclusive). The three levels of the quarries were developed in 1920–34 to provide stone for the construction of Scar House Dam, which has a concrete core and masonry face. The dam trench was excavated in the highest Yoredale strata and the Grassington Grit Formation. In their heyday the quarries employed 400 men. Looking southwards, another old quarry visible on Rain Stang was open in 1904–15 to provide stone for the Angram Dam, farther up the valley. Note the great landslip of Woodale Scar beneath this quarry, formed by freeze-thaw at the close of the Devensian glaciation. Also one can see the dramatic right-angled bend of the Nidd 4 km to the east. This may mark the point of capture of the eastward-flowing proto-Nidd by a southward-flowing stream.
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Walk across the dam to the north side and ascend the old incline to Carle Side Quarries (access restricted to August till February inclusive). The three levels of the quarries were developed in 1920–34 to provide stone for the construction of Scar House Dam, which has a concrete core and masonry face. The dam trench was excavated in the highest Yoredale strata and the Grassington Grit Formation. In their heyday the quarries employed 400 men. Looking southwards, another old quarry visible on Rain Stang was open in 1904–15 to provide stone for the Angram Dam, farther up the valley. Note the great landslip of Woodale Scar beneath this quarry, formed by freeze-thaw at the close of the Devensian glaciation. Also one can see the dramatic right-angled bend of the Nidd 4 km to the east. This may mark the point of capture of the eastward-flowing proto-Nidd by a southward-flowing stream.
  
The lower sandstones of the Scar House Formation in the quarries at Carle Side were deposited by voluminous density currents beyond the mouth bar of a river. These are followed on the second level of the quarry by prodelta sand lobes with '''flute marks''' on some bedding planes, shown well in fallen blocks from above a bush high on the face. Ascend the dumps to the highest quarry level where medium-grained channel sandstones are displayed. At the undulating base of the higher channel a '''conglomerate''' with abundant siltstone rip-up '''clasts''' is well seen. Higher strata are thinly bedded mouth bar sandstones, overlain by mudstones. The skyline feature is in Lower Follifoot Grit.
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The lower sandstones of the Scar House Formation in the quarries at Carle Side were deposited by voluminous density currents beyond the mouth bar of a river. These are followed on the second level of the quarry by prodelta sand lobes with flute marks on some bedding planes, shown well in fallen blocks from above a bush high on the face. Ascend the dumps to the highest quarry level where medium-grained channel sandstones are displayed. At the undulating base of the higher channel a conglomerate with abundant siltstone rip-up clasts is well seen. Higher strata are thinly bedded mouth bar sandstones, overlain by mudstones. The skyline feature is in Lower Follifoot Grit.
  
 
Traverse the hillside westwards from the highest quarry levels along the top of the feature in the Red Scar Grit. Blocks from the upper half of this grit include abundant crinoid columnals and rarely the brachiopod ''Spirifer. ''Walk to the second stream, Stand Syke, which drains to an angular embayment in Scar House Reservoir.
 
Traverse the hillside westwards from the highest quarry levels along the top of the feature in the Red Scar Grit. Blocks from the upper half of this grit include abundant crinoid columnals and rarely the brachiopod ''Spirifer. ''Walk to the second stream, Stand Syke, which drains to an angular embayment in Scar House Reservoir.

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