noun[mass noun] Geology
A series of sedimentary rocks, chiefly red sandstones, belonging to the Devonian system of NW Europe.
- However, the change in structural dip could reflect synsedimentary tectonics (and hence an intrabasinal unconformity developed entirely within an Old Red Sandstone succession), and the dykes may not be syndepositional.
- They concluded that the Bristol Channel Thrust juxtaposes the Devonian of north Devon and the Old Red Sandstone and Carboniferous of South Wales.
- The Stonehaven Group lies at the base of the Old Red Sandstone in the Midland Valley of Scotland and sits unconformably on the Highland Border Complex.
For editors and proofreaders
Line breaks: Old Red Sand|stone
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