Editing Permian rocks of south-central Yorkshire - an excursion

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Park in the quarry, behind the houses. '''No hammering please; hard hats recommended.''' An important section that exposes the Hampole Beds and adjoining parts of the Wetherby and Sprotbrough members of the Cadeby Formation (EZ1Ca) (see [[:File:YGS_YORKROCK_TAB_14_02.jpg|Table 14.2]]).
 
Park in the quarry, behind the houses. '''No hammering please; hard hats recommended.''' An important section that exposes the Hampole Beds and adjoining parts of the Wetherby and Sprotbrough members of the Cadeby Formation (EZ1Ca) (see [[:File:YGS_YORKROCK_TAB_14_02.jpg|Table 14.2]]).
  
The Hampole Beds record a phase when the sea level fell by a few metres and subsequently rapidly recovered. The sea level fall led to subaerial exposure and the cutting of the Hampole Discontinuity, an erosion surface that can be traced from Ripon to Nottingham, and the return of the sea caused the shoreline to retreat westwards. The area then became part of a north–south offshore belt of large white submarine sand waves composed of ooliths. The sediment below the sea floor at this time was able to support a variety of burrowing organisms but the current-swept sea floor itself was an inhospitable and dangerous place and few invertebrates survived to be preserved as fossils. The 'fenestral fabric' in the lower part of the Hampole Beds is thought to have been caused by the expansion of trapped methane bubbles given off by decaying organic (microbial) films ('algal mats') in the laminated intertidal sediment. The 0.8 m bed in which it is present is an excellent and readily recognizable building stone and features in most of the stone-built houses and walls in New Micklefield.
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The Hampole Beds record a phase when the sea level fell by a few metres and subsequently rapidly recovered. The sea level fall led to subaerial exposure and the cutting of the Hampole Discontinuity, an erosion surface that can be traced from Ripon to Nottingham, and the return of the sea caused the shoreline to retreat westwards. The area then became part of a north–south offshore belt of large white submarine sand waves composed of ooliths. The sediment below the sea floor at this time was able to support a variety of burrowing organisms but the current-swept sea floor itself was an inhospitable and dangerous place and few invertebrates survived to be preserved as fossils. The 'fenestral fabric' in the lower part of the Hampole Beds is thought to have been caused by the expansion of trapped methane bubbles given off by decaying organic (microbial) films ('algal mats') in the laminated intertidal sediment. The 0.8 m bed in which it is present is an excellent and readily recognizable building stone and features in most of the stone-built houses and walls in New Micklefield.
  
 
A notice board gives additional information and interpretation.
 
A notice board gives additional information and interpretation.
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[[Category:Yorkshire rocks and landscape: a field guide ]]
 
 
[[Category:9. Eastern England from the Tees to the Wash]]
 
[[Category:9. Eastern England from the Tees to the Wash]]

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