A Geological History of Yorkshire Dr Liam Herringshaw

A Geological History of Yorkshire Dr Liam Herringshaw Palaeontologist, Hidden Horizons Director, Yorkshire Fossil Festival

Ordovician Ingleton Group, Pecca Falls Quarry Acritarch microfossils

Ordovician granite

Silurian turbidites Austwick Formation, Horton-in-Ribblesdale

Devonian – missing! CARBONIFEROUS ROCKS ORDOVICIAN ROCKS England Scotland collided! Thornton Force unconformity

Dales limestones Early Carboniferous • Early Carboniferous – Great Scar Limestone Group

Blocks and basins • Early Carboniferous shales Bowland Shales, Bolton Abbey

Hydration Break

Late (proper!) Carboniferous Pennine Coal Measures Group divided in 3 (Lower, Middle, Upper)

Late Carboniferous Millstone Grit – tough sandstones

Late Carboniferous Yoredale Cycles (Phillips 1836) 1. Limestone -----4. Mudstone / coal 3. Sandstone 2. Shales 1. Limestone -------4. Mudstone / coal From Tucker et al. (2009)

Permian Magnesian Limestone

Permian potash! Woodsmith Mine, nr Whitby

On the shores of the Zechstein Sea

Ripon yarns Dissolving Permian rocks = sinkholes (and Alice holes)

Triassic • Sherwood Sandstone • Mercia Mudstone Sherwood Sandstone quarry, North Notts

T Break

Early Jurassic Hildoceras bifrons Mostly marine mudstones Saltwick Nab

Middle Jurassic Scarborough’s meandering dinosaurs

Oo, Late Jurassic lobsters! • Filey Brigg

Early Cretaceous • Speeton Clay

Late Cretaceous Flamborough Chalk • Selwicks Bay

Cenozoic • Faults, folds, and dykes Cleveland Dyke Flamborough folds

Quaternary 1821: Bones found, Kirkdale Cave 1822: Buckland enters a hyaena den

Quaternary: Holderness Soft, young, Ice Age deposits, full of exotics!

Image from Hall et al. (2010)

In conclusion OLDEST YOUNGEST

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