The lithostratigraphy of the Old Red Sandstone of the Southern Highlands, Midland Valley of Scotland and the Southern Uplands Terrane has been reviewed. Before this there were over 100 formations and members in the Lower Old Red Sandstone. The new term Lanark Group includes all late Silurian to Devonian formations in the Lanark Basin. (Adobe Acrobat PDF 3.06 MB)
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