Editing Craven Fault Zone — Malham to Settle - an excursion

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[[File:YGS_YORKROCK_FIG_02_03.jpg|thumbnail|Figure 2.3 Geological section across the Middle Craven Fault near Malham. Abbreviations as in Figure 2.1.]]
 
[[File:YGS_YORKROCK_FIG_02_03.jpg|thumbnail|Figure 2.3 Geological section across the Middle Craven Fault near Malham. Abbreviations as in Figure 2.1.]]
  
'''By David Mundy''' ''Talisman Energy, Calgary ''and '''Russell Arthurton''' formerly ''British Geological Survey, Keyworth, Nottingham''
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'''By David Mundy''' ''Talisman Energy, Calgary ''and Russell Arthurton formerly ''British Geological Survey, Keyworth, Nottingham''
  
 
== Purpose ==
 
== Purpose ==
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=== Locality 18, Corner of High Hill Lane and Stockdale Lane [SD 836 630] ===
 
=== Locality 18, Corner of High Hill Lane and Stockdale Lane [SD 836 630] ===
  
From this location, view the steep southern slope of High Hill, formed in 'reef' limestones. This topography is a pre-Namurian surface exhumed from a cover of Upper Bowland Shales, and gives an impression of the original bathymetry of the shelf margin. The extensive late Dinantian erosion on the front of the build-up has all but removed the basinward-dipping flank beds (as seen at Cawden, Malham), revealing mostly the unbedded 'core' of bank facies. Debris from this erosional episode was deposited to the south as conglomerates and boulder beds of the Pendleside Limestone and Lower Bowland Shales (as exposed nearby at Scaleber). This erosion surface has cut down progressively southwards, through the northward-dipping succession in the fault block defined by the South Craven Fault, intercepting the pre-'reefal' Holkerian and Arundian succession of the Scaleber Quarry and Scaleber Force limestones (correlatives of the Kilnsey Formation). This deep erosion on the downside of the MCF (well exposed at Scaleber Beck and Scaleber Force some 600 m to the southwest) is associated with the minor compressional episode that preceded the major collapse on the faults. Continue west back to Settle via High Hill Lane (1.5 km) or rejoin vehicles parked adjacent to this locality.
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From this location, view the steep southern slope of High Hill, formed in 'reef' limestones. This topography is a pre-Namurian surface exhumed from a cover of Upper Bowland Shales, and gives an impression of the original bathymetry of the shelf margin. The extensive late Dinantian erosion on the front of the build-up has all but removed the basinward-dipping flank beds (as seen at Cawden, Malham), revealing mostly the unbedded 'core' of bank facies. Debris from this erosional episode was deposited to the south as conglomerates and boulder beds of the Pendleside Limestone and Lower Bowland Shales (as exposed nearby at Scaleber). This erosion surface has cut down progressively southwards, through the northward-dipping succession in the fault block defined by the South Craven Fault, intercepting the pre-'reefar Holkerian and Arundian succession of the Scaleber Quarry and Scaleber Force limestones (correlatives of the Kilnsey Formation). This deep erosion on the downside of the MCF (well exposed at Scaleber Beck and Scaleber Force some 600 m to the southwest) is associated with the minor compressional episode that preceded the major collapse on the faults. Continue west back to Settle via High Hill Lane (1.5 km) or rejoin vehicles parked adjacent to this locality.
 
== [[Yorkshire rocks and landscape: a field guide#Glossary|Glossary]] ==
 
== [[Yorkshire rocks and landscape: a field guide#Glossary|Glossary]] ==
  

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