Geology and Natural History
The hills are formed from chalk, and make an arc from the Humber estuary west of Kingston upon Hull up to the North Sea coast between Bridlington and Scarborough. Here they rise up to form cliffs, most notably at Flamborough, Bempton Cliffs and Filey; Flamborough Headland is designated a Heritage Coast. On the other side of the Humber, the chalk formations continue as the Lincolnshire Wolds; in fact, one can view the Humber as cutting through a single formation (see also Humber Gap). The Humber Bridge was built at the point due to its geological stability.
Most of the area takes the form of an elevated, gently rolling plateau, cut by numerous deep, steep-sided, flat-bottomed valleys of glacial origin. The chalk formation of the hills provides exceptionally good drainage, with the result that most of these valleys are dry; indeed, surface water is quite scarce throughout the Wolds. Typically the valleys are hard to see from above, creating the visual impression that the landscape is much flatter than is actually the case. The unusual topography results in an "upside-down" farming system - livestock (mostly sheep and cows) graze the valleys, with the hills above used for crops.
Read more about this topic: Yorkshire Wolds
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