Geology of the Yorkshire Dales

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Presentation transcript:

Geology of the Yorkshire Dales Part 2: Early Carboniferous

Early Carboniferous Basins and dales of limestones and shales Two distinct regions: Askrigg Block = Limestone dales Craven, Harrogate, Bowland = Shale basins

Up on the blocks Granite-buoyed high LIMY: 3. Yoredale Group 2. Great Scar Limestone Gp 1. Ravenstonedale Group

Great Scar Limestone Group Malham

The not-great-for-fossils group Broken-down + dissolved

But some patches Reef knolls at Malham and Cracoe

(Karst & Caves)

Down in the basins Tectonic lows Craven, Harrogate and Bowland basins: MUDDY 2. Craven Group 1. Bowland High Group

Blocks & Basins Cross-section through Malham region

Goniatites in mudstones = biostratigraphy Marine bands Goniatites in mudstones = biostratigraphy

Dales for shale? Shale gas potential from organic-rich mudstones