Geology Of Yorkshire
In Yorkshire there is a very close relationship between the major topographical areas and the geological period in which they were formed. The rocks of the Pennine chain of hills in the west are of Carboniferous origin whilst those of the central vale are Permo-Triassic. The North York Moors in the north-east of the county are Jurassic in age while the Yorkshire Wolds to the south east are Cretaceous chalk uplands. The plain of Holderness and the Humberhead levels both owe their present form to the Quaternary ice ages. The strata become gradually younger from west to east.
Much of Yorkshire presents heavily glaciated scenery as few places escaped the great ice sheets as they advanced during the last ice age.
Read more about Geology Of Yorkshire: Geological Sites of Special Scientific Interest in Yorkshire
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... See also List of SSSIs in North Yorkshire, South Yorkshire, West Yorkshire, and Humberside (East Riding of Yorkshire) Site name Grid ref Geological feature ...