River Wear

The River Wear (pronounced WEER) in North East England rises in the Pennines and flows eastwards, mostly through County Durham to the North Sea in the City of Sunderland. At 60 mi (97 km) long, it is one of the region's longest rivers, wends in a steep valley through the cathedral city of Durham and gives its name to Weardale in its upper reach and Wearside by its mouth.

Geology

The Wear rises in the east Pennines, an upland area raised up during the Caledonian orogeny. Specifically, the Weardale Granite underlies the headwaters of the Wear. Devonian Old Red Sandstone in age, this Weardale Granite does not outcrop but was surmised by early geologists, and subsequently proven to exist as seen in the Rookhope borehole. It is the presence of this granite that has retained the high upland elevations of this area (less through its relative hardness, and more due to isostatic equilibrium) and accounts for heavy local mineralisation, although it is considered that most of the mineralisation occurred during the Carboniferous period.