Editing Lower and Middle Jurassic rocks between Robin Hood's Bay and Hawsker Bottoms - an excursion

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=== Locality 10, Clock Case Nab [NZ 956 071] ===
 
=== Locality 10, Clock Case Nab [NZ 956 071] ===
  
A thin split ironstone nodule horizon can be seen at the base of Clock Case Nab. Looking northwest across the embayment called Far Jetticks towards Hawsker High Cliff and High Scar, there is a fine view of the upper Middle Lias (''spinatum ''Biozone) on the foreshore section with a thick sequence of the Upper Lias (Whitby Mudstone Formation: Grey Shale Member to Alum Shale Member) in the cliff section above.
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A thin split ironstone nodule horizon can be seen at the base of Clock Case Nab. Looking northwest across the embayment called Far Jetticks towards Hawsker High Cliff and High Scar, there is a fine view of the upper Middle Lias ''(spinatum ''Biozone) on the foreshore section with a thick sequence of the Upper Lias (Whitby Mudstone Formation: Grey Shale Member to Alum Shale Member) in the cliff section above.
  
 
=== Locality 11, Far Jetticks [NZ 953 073] ===
 
=== Locality 11, Far Jetticks [NZ 953 073] ===
  
The Upper Middle Lias section at Far Jetticks, some 12.5 m thick, may be compared with that seen in the Staithes–Port Mulgrave section (Excursion 16). All the subzone index ammonites may be found on this section together with many belemnites, bivalves and nests of ''Tetrarhynchia''.
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The Upper Middle Lias section at Far Jetticks, some 12.5 m thick, may be compared with that seen in the Staithes–Port Mulgrave section (Excursion 16). All the subzone index ammonites may be found on this section together with many belemnites, bivalves and nests of ''Tetrarhynchia''.
  
 
While in the vicinity of Hawsker High Cliff look ''(with extreme caution) ''at the fallen material at the base of the cliff. Pyrite-skinned nodules contain ''Harpoceras exaratum'' and ''H. falciferum'' (index fossils of the Mulgrave Shale Member), while grey nodules containing ''Dactylioceras'' and ''Hildoceras'' indicate the Grey Shale and Alum Shale Members.
 
While in the vicinity of Hawsker High Cliff look ''(with extreme caution) ''at the fallen material at the base of the cliff. Pyrite-skinned nodules contain ''Harpoceras exaratum'' and ''H. falciferum'' (index fossils of the Mulgrave Shale Member), while grey nodules containing ''Dactylioceras'' and ''Hildoceras'' indicate the Grey Shale and Alum Shale Members.
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=== Locality 12, Hawsker High Scar [NZ 951 077] ===
 
=== Locality 12, Hawsker High Scar [NZ 951 077] ===
  
The calcareous sandstone that forms the top of the scar, which may involve a 3 m scramble, is some 3.20 m below the top of the Middle Lias. The sediments here indicate an important event boundary within the Yorkshire Basin, where the shallow-water sediments of the Cleveland Ironstone Formation abruptly change to deeper-water sediments of the Whitby Mudstone Formation (Grey Shale Member).
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The calcareous sandstone that forms the top of the scar, which may involve a 3 m scramble, is some 3.20 m below the top of the Middle Lias. The sediments here indicate an important event boundary within the Yorkshire Basin, where the shallow-water sediments of the Cleveland Ironstone Formation abruptly change to deeper-water sediments of the Whitby Mudstone Formation (Grey Shale Member).
  
 
=== Locality 13, White Stone Hole (NZ 950 076] ===
 
=== Locality 13, White Stone Hole (NZ 950 076] ===

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