10/7/20

A Geological History of Yorkshire Dr Liam Herringshaw

Palaeontologist, Hidden Horizons Director, Yorkshire Fossil Festival

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Ordovician

Ingleton Group, Pecca Falls Quarry Acritarch microfossils

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Ordovician granite

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Silurian turbidites

Austwick Formation, Horton-in-Ribblesdale

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Devonian – missing!

CARBONIFEROUS ROCKS

ORDOVICIAN ROCKS

England and Scotland collided!

Thornton Force unconformity

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DalesEarly Carboniferous limestones

• Early Carboniferous – Great Scar Limestone Group 9

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Blocks and basins • Early Carboniferous shales

Bowland Shales, Bolton Abbey

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Hydration Break

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Late (proper!) Carboniferous

Pennine Coal Measures Group divided in 3 (Lower, Middle, Upper) 12

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Late Carboniferous

Millstone Grit – tough sandstones 13

Late Carboniferous

1. Limestone ------Yoredale Cycles 4. Mudstone / coal 3. Sandstone (Phillips 1836) 2. Shales 1. Limestone ------4. Mudstone / coal

From Tucker et al. (2009) 14

Permian Magnesian Limestone

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Permian potash!

Woodsmith Mine, nr Whitby

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On the shores of the Zechstein Sea

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Ripon yarns

Dissolving Permian rocks = sinkholes (and Alice holes)

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Triassic • Sherwood Sandstone • Mercia Mudstone

Sherwood Sandstone quarry, North Notts

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T Break

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Hildoceras bifrons Early Jurassic

Mostly marine mudstones

Saltwick Nab

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Middle Jurassic

Scarborough’s meandering dinosaurs

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Oo, Late Jurassic lobsters!

• Filey Brigg

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Early Cretaceous

• Speeton Clay

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Late Cretaceous

Flamborough Chalk

• Selwicks Bay

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Cenozoic • Faults, folds, and dykes

Cleveland Dyke

Flamborough folds

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Quaternary

1821: Bones found, Kirkdale Cave

1822: Buckland enters a hyaena den

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Quaternary: Holderness

Soft, young, Ice Age deposits, full of exotics!

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Image from Hall et al. (2010)

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OLDEST In conclusion

YOUNGEST

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