Portencross
Leaders: Austen Brown and David Webster The rocks exposed around Portencross are mainly sandstones (known across the UK as the âOld Red Sandstoneâ (ORS) dating back to the Devonian Period (420 to 360 million years ago). The âLower Old Red Sandstoneâ was deposited in desert environments in the aftermath of the Caledonian Orogeny when Scotland […]