The site is situated on the Whin Sill, igneous rock dolerite found in County Durham and Northumberland, which outcrops as high, rocky cliff lines, and which was used by the builders of Hadrian's Wall to full strategic advantage.
22.
In the central sector the Wall runs along the top of the crags of the Whin Sill, while the Vallum, laid out in long straight stretches, lies in the valley below to the south, as much as away.
23.
The Cheviot Hills, separated by the Tyne Gap and the Whin Sill, along which run the High Peak of Derbyshire at Edale, the start of the Pennine Way, although hills continue towards the Stoke-on-Trent area in northern Staffordshire and into eastern, southern and western parts of Cheshire, Derbyshire and Nottinghamshire respectively.
24.
The particular rock of the Winn Sill gives rise to conditions less acidic than comparable types, and the overlying soil is thin and peaty; it provides a habitat for glasses than tolerate dry conditions, notably wild chives ( " Allium schoenoprasum " ), rare in Northumberland other than on the Whin Sill.
25.
The geology of the North East of England around Alnmouth is a superficial layer of glacial till in the form of boulder clay lying on often outcropping Whin Sill, a carboniferous limestone, with peat deposits, and, at the coast, wind-blown sand including a coastline dune system which has evolved over the last 10, 000 years.
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