Page:Transactions of the Natural History Society of Northumberland, Durham, and Newcastle-upon-Tyne (1867).djvu/116

98 Bridge, where the line between the Millstone Grit and Coal Measures strikes the stream, the elevation is 350 feet. Very soon the county boundary leaves the Derwent and runs northward along the Stanley Burn to the Tyne at Wylam. On the north side of the Derwent the moor between Hedley and Chopwell Park attains 850 feet, and between Ryton and Winlaton a small stream runs down a wooded dene to the Tyne at Blaydon. Along the 10 miles due east, from Shotley by way of Medomsley and Tanfield to Ravensworth, the highest points of the undulated coal-country reach from 750 to 600 feet. The parks and halls of Chopwell, Gibside, and Axwell pleasantly diversify the last 5 miles of the Derwent, which joins the Tyne a short distance above Newcastle. The undulated coal-country south of Newcastle is drained by a small stream called the Team, with a wooded dene at Tanfield, and a castle and park upon its banks at Ravensworth. A narrow tract of Magnesian Limestone belongs to this drainage district, the highest point of which is at West Boldon (307 feet), whence a rivulet runs down to the Tyne at Jarrow. The area of the district is about 200 square miles.

The county of Durham, towards its western extremity, does not measure more than 10 miles across. The Derwent does not attain the county boundary, and this 10 miles includes the whole breadth of the tract drained by the Wear and half of that drained by the Tees, the other half belonging to Yorkshire. The Wear watershed forms the eastern boundary of Cumberland for 6 miles,