“This group in Northumberland is seen, westward of Alnwick at Garmitage-bank and Crawley Dean, and on the flanks of the porphyry of the Cheviot in Biddleston Burn, and in the Coquet below Linn Brig; it occupies a considerable area in the south part of Berwickshire, and is largely developed on the Tweed at Carham, Coldstream, Norham, etc.; it is seen underlying the mountain-limestone on the sea-coast from near Lammerton Shiel to Burnmouth; on the north side of Lammermuirs it is intercalated between the Old Red Sandstone, and the mountain-limestone from the Pees mouth to the Cove harbour.”

Mr. Tate observes also that the Campsie and Fifeshire beds resemble those of Northumberland.