Editing Chalk of Flamborough Head - an excursion

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=== Locality 1, Sewerby [TA 202 687] ===
 
=== Locality 1, Sewerby [TA 202 687] ===
  
Flamborough Chalk Formation (Sewerby Member), ''Inoceramus lingua '''''Biozone''' (60 m). Reach Sewerby on a minor road off the B1255 from Bridlington. Park at Sewerby Park (Zoo and small Museum, with cafe and toilets), walk to the cliff edge and descend to the beach by the concrete Sewerby Steps, noting the rotational slipping of the Skipsea '''Till''' along a spring line. The beach is built of chalk boulders, many bored by modern '''bivalves''', together with erratics and large blocks of calcrete, a post-glacial gravel cemented by calcium carbonate. The chalk is soft and flintless, with thin marly partings. Investigation is often prevented by rainwash from above, bringing down mudflows of drift, and by rock falls. In the past, the wave-cut platforms offered good collecting, especially from the Flamborough '''Sponge''' Bed that stretches from here almost to Danes Dyke, but it is better to collect from beach boulders. Fossils found include bivalves, '''echinoids, brachiopods''', starfish plates, '''ammonites''' and well-preserved hexactinellid and lithistid sponges.
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Flamborough Chalk Formation (Sewerby Member), ''Inoceramus lingua ''Biozone (60 m). Reach Sewerby on a minor road off the B1255 from Bridlington. Park at Sewerby Park (Zoo and small Museum, with cafe and toilets), walk to the cliff edge and descend to the beach by the concrete Sewerby Steps, noting the rotational slipping of the Skipsea Till along a spring line. The beach is built of chalk boulders, many bored by modern bivalves, together with erratics and large blocks of calcrete, a post-glacial gravel cemented by calcium carbonate. The chalk is soft and flintless, with thin marly partings. Investigation is often prevented by rainwash from above, bringing down mudflows of drift, and by rock falls. In the past, the wave-cut platforms offered good collecting, especially from the Flamborough Sponge Bed that stretches from here almost to Danes Dyke, but it is better to collect from beach boulders. Fossils found include bivalves, echinoids, brachiopods, starfish plates, ammonites and well-preserved hexactinellid and lithistid sponges.
  
Some 250 m south, the gently dipping chalk cliffs end at the Sewerby Buried Cliff ([[:File:YGS_YORKROCK_FIG_21_03.jpg|Figure 21.3]]) which displays a section through glacial and interglacial deposits banked against and over the old cliff face. This feature can be traced southwards along the edge of the Yorkshire Wolds to Hessle and into Lincolnshire, and represents an interglacial cliffline of between 116 000 and 128 000 years ago. The exposure varies depending on the amount of slippage, but when it is clear the interglacial beach at the base can be seen resting on a planed wave-cut platform of chalk and Basement Till. From these deposits fragmented mammalian bones have been collected indicating an Ipswichian age. The interglacial beach is covered by rain wash, scree deposits, blown sands, and Chalk rubble with loess, capped with Skipsea Till, followed by '''glaciofluvial''' Sewerby Gravels containing mammoth teeth and human artifacts.
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Some 250 m south, the gently dipping chalk cliffs end at the Sewerby Buried Cliff ([[:File:YGS_YORKROCK_FIG_21_03.jpg|Figure 21.3]]) which displays a section through glacial and interglacial deposits banked against and over the old cliff face. This feature can be traced southwards along the edge of the Yorkshire Wolds to Hessle and into Lincolnshire, and represents an interglacial cliffline of between i 16 000 and 128 000 years ago. The exposure varies depending on the amount of slippage, but when it is clear the interglacial beach at the base can be seen resting on a planed wave- cut platform of chalk and Basement Till. From these deposits fragmented mammalian bones have been collected indicating an Ipswichian age. The interglacial beach is covered by rain wash, scree deposits, blown sands, and Chalk rubble with loess, capped with Skipsea Till, followed by glaciofluvial Sewerby Gravels containing mammoth teeth and human artifacts.
  
 
Return to Sewerby Steps and the car park or coastal path, or continue east along the beach to Danes Dyke, with many fossils, including sponges, to be found en route.
 
Return to Sewerby Steps and the car park or coastal path, or continue east along the beach to Danes Dyke, with many fossils, including sponges, to be found en route.

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