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Geology of the Yorkshire Coast
Dr Liam Herringshaw - [email protected]
Most of the middle is Middle
Middle Jurassic
“The Dogger”
I. Ravenscar
Group
II. Cornbrash,
Cayton Clay &
Osgodby
formations Ravenscar – Scarborough
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Whitby cliffs
Mudstones incised by sandstones
Lower Jurassic mudstones
Middle Jurassic sandstones
Middle Jurassic: shallow and sandy
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Simplified
stratigraphy
Saltwick Formation
Dogger Formation
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Ravenscar Group
“Deltaic Series” or “Estuarine Series”
1. Saltwick Formation (non-marine)
2. Eller Beck Formation (marine)
3. Cloughton Formation (non-marine)
4. Scarborough Formation (marine)
5. Scalby Formation (non-marine)
Scalby Bay meander belt
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Tidal sediments
Yons Nab, Cayton Bay
Shallow marine burrows
Diplocraterion, Cloughton Wyke
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Soils, coals, roots
Yons Nab, Cayton Bay
Dinoturbation
Cloughton Wyke
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Hayburn Wyke
Great for plant fossils
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Fossil
plants of
the
Middle
Jurassic
Scarborough Fm, Scarborough
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Middle Jurassic Museums
Rotunda and
Yorkshire museums
built of Hackness
Stone
Upper Jurassic – Cleveland Basin
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Upper Jurassic
stratigraphy
Yorkshire:
Oxfordian
Kimmeridgian
(but no
Portlandian)
Scarborough:
Castle Hill
A faulted outlier
Resistant Upper
Jurassic rocks
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Peak
Trough
East-southeast
to Filey Lower Calcareous Grits
Oxford Clay
Lower Oxfordian
(OXC-LCG)
well-exposed
between
Cunstone Nab
and Filey Brigg
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Filey Brigg
Birdsall Calcareous Grit:
wedge of tough, limy sandstone
Filey Brigg
stratigraphy
Coarse-grained
Limestones-sandstones
Oolites
Shelly fossils
Trace fossils
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Big Brigg burrows!
Uppermost Jurassic
Not much on coast: head inland!
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Kimmeridgian?
Very dark, soft, and very rarely seen in Yorkshire
Kimmeridge Clay Formation
Very occasionally exposed at Speeton Sands
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Jurassic-Cretaceous boundary
somewhere in Filey Bay
Links
Middle Jurassic of Yorkshire: http://www.thegcr.org.uk/ImageBank.cfm?v=26&Style=Chapter&Chapter=05
British Middle Jurassic Stratigraphy: http://www.thegcr.org.uk/ImageBank.cfm?v=26&Style=Contact
Sheffield Dinosaur Trackway Group: http://www.sorbygeology.group.shef.ac.uk/dino.html
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Links
The BGS Lexicon of named rock units: http://www.bgs.ac.uk/lexicon/home.html
Upper Jurassic Stratigraphy of Yorkshire: http://www.thegcr.org.uk/ImageBank.cfm?v=21&Style=Chapter&Chapter=04
Middle-Upper Jurassic of UK: http://www.geolsoc.org.uk/gsl/pid/10462;jsessionid=C52B58AD38EFF1AD9CB18C69375EA57F