A Geological History of Yorkshire Dr Liam Herringshaw

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10/7/20 A Geological History of Yorkshire Dr Liam Herringshaw Palaeontologist, Hidden Horizons Director, Yorkshire Fossil Festival 1 2 3 1 10/7/20 4 Ordovician Ingleton Group, Pecca Falls Quarry Acritarch microfossils 5 Ordovician granite 6 2 10/7/20 Silurian turbidites Austwick Formation, Horton-in-Ribblesdale 7 Devonian – missing! CARBONIFEROUS ROCKS ORDOVICIAN ROCKS England and Scotland collided! Thornton Force unconformity 8 DalesEarly Carboniferous limestones • Early Carboniferous – Great Scar Limestone Group 9 3 10/7/20 Blocks and basins • Early Carboniferous shales Bowland Shales, Bolton Abbey 10 Hydration Break 11 Late (proper!) Carboniferous Pennine Coal Measures Group divided in 3 (Lower, Middle, Upper) 12 4 10/7/20 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 15 5 10/7/20 Permian potash! Woodsmith Mine, nr Whitby 16 On the shores of the Zechstein Sea 17 Ripon yarns Dissolving Permian rocks = sinkholes (and Alice holes) 18 6 10/7/20 Triassic • Sherwood Sandstone • Mercia Mudstone Sherwood Sandstone quarry, North Notts 19 T Break 20 Hildoceras bifrons Early Jurassic Mostly marine mudstones Saltwick Nab 21 7 10/7/20 Middle Jurassic Scarborough’s meandering dinosaurs 22 Oo, Late Jurassic lobsters! • Filey Brigg 23 Early Cretaceous • Speeton Clay 24 8 10/7/20 Late Cretaceous Flamborough Chalk • Selwicks Bay 25 Cenozoic • Faults, folds, and dykes Cleveland Dyke Flamborough folds 26 Quaternary 1821: Bones found, Kirkdale Cave 1822: Buckland enters a hyaena den 27 9 10/7/20 Quaternary: Holderness Soft, young, Ice Age deposits, full of exotics! 28 Image from Hall et al. (2010) 29 OLDEST In conclusion YOUNGEST 30 10 10/7/20 Find out more: www.fossilhub.org Email: [email protected] • Hidden Horizons The Fossil Shop, 65a Eastborough, Scarborough: • https://www.eventbrite.co.uk/o/hidden-horizons-5979675763 • https://www.facebook.com/HiddenHorizonsLtd/ • Yorkshire Fossil Festival Scarborough, September 11th & 12th 2021. • @YorksFossilFest on Twitter and Facebook • Geology Hull 31 11.

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