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Geology of the Yorkshire Coast
Dr Liam Herringshaw - [email protected]
Sedimentary rock types
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Sedimentary grain size
Grain size reflects energy: – - Strong currents pick up larger grains – - Proxy for environment (& sea level)
Geology of Yorkshire
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Coastal geology of North- East Permian England
Triassic
Permian on the Yorkshire coast
Boulby Potash Mine
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Salts from the Zechstein Sea
Large, arid, northern European basin
Drilling for salts
Permian polyhalites
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Magnesian Limestone
Permian at the coast
Caythorpe gas field, near Bridlington
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Geology of the Yorkshire Coast - The Cleveland Basin
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The Early Jurassic: Redcar – Ravenscar
Redcar Mudstone Formation Staithes Sandstone Formation Cleveland Ironstone Formation Whitby Mudstone Formation
Lias Group
Lias = Old term for lower Jurassic;
In Yorkshire (after Powell 1984): - Lower Lias = Redcar Mudstone Formation; - Middle Lias = Staithes Sandstone Formation, Cleveland Ironstone Formation; - Upper Lias = Whitby Mudstone Formation
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Lias of Yorkshire
Redcar Mudstone Formation
Robin Hood's Bay
Redcar
Earliest Jurassic unit on Yorkshire Coast – - Divided into 4 members
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Redcar Rocks
Redcar Rocks geological map (Rawson & Wright 1992)
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Hummersea
Image © Dave Eagle, geograph.org.uk
Common fossils
Gryphaea arcuata, an Early Jurassic 'oyster'
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Trace fossils
Rhizocorallium, Boggle Hole
Robin Hood's Bay
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Robin Hood's Bay
Why does Redcar Mudstone Fm reappear so far south of Redcar?
The Peak Fault
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The Cleveland Anticline
Older rocks reach surface in axis of fold
Links
North Yorkshire Geodiversity Partnership: http://www.nygp.org.uk/index.php
North-East Yorkshire Geology Trust: http://www.avm-branding.com/neygt/pages/whatwedo.html
Tees Valley RIGS Group: http://www.tvrigs.org.uk/
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Links Boulby Potash Mine http://www.mining-technology.com/projects/boulby/
North Yorks geology (Natural England): http://www.naturalengland.org.uk/ourwork/conservation/geodiversity/englands/counties/area_ID41.aspx
Durham & Tees geology (Natural England): http://www.naturalengland.org.uk/ourwork/conservation/geodiversity/englands/counties/area_ID11.aspx
Links British Lower Jurassic Stratigraphy: http://www.thegcr.org.uk/ImageBank.cfm?v=30&Style=All
RMF, Redcar Rocks: http://www.redcar.ukfossils.co.uk/
RMF, Hummersea: http://www.tvrigs.org.uk/archives/69
RMF, Robin Hood's Bay: jncc.defra.gov.uk/pdf/gcrdb/GCRsiteaccount1943.pdf
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