Q:

What do you find on a geological map of Yorkshire, England?

A:

Quick Answer

A geological map of Yorkshire, England, shows areas of limestone, sandstone, mudstone and coal formed mainly during the Carboniferous, Permo-Triassic, Jurassic and Cretaceous periods. Glaciers advanced and retreated over the area several times, reshaping the landscape and creating areas of fertile soil.

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Full Answer

The Pennines, an anticline that appears as an upland area of high moorland, runs north to south across the western part of Yorkshire. Its limestone and Millstone Grit formed from the sandy deltas that formed across the area during the Carboniferous age. The swamps and rainforests in those deltas formed the coal veins of the Yorkshire Coalfield.

Just to the east is the Magnesian Limestone Belt, which is a narrow strip that runs north and south across Yorkshire. The limestone and clay deposits came from an evaporating inland sea during the Permian period. This area is now very fertile.

Deep beneath the vales of Mowbray and York lie sandstone and mudstone from the Triassic and Jurassic periods, most of it buried under glacial till, sand and gravel.

The North York Moors were a tropical sea during the Jurassic period. The coral and other aquatic creatures became sandstone and limestone. Glaciers scraped over the area time and again, eroding the rocks into soil. At the end of the last ice age, runoff from melting glaciers ran south and formed Lake Pickering.

Holderness has fertile soil from well-drained glacial deposits, but the underlying chalk formed during the Cretaceous period.

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