Abstract
Synopsis The petrology of two Lower Old Red Sandstone breccias associated with an early linear vent (Hardie 1968) is described. The vent, much of which is covered by later rhyolite originating elsewhere, is occupied by a pyroclastic breccia containing abundant fragments of quartzite as well as acid trachyte fragments. This is the first record of trachyte in the area, and chemical analyses show that it is unusually rich in potash (K 2 O 10–11%). The second breccia consists entirely of quartzite and has been mapped as explosion–breccia. It occurs as relatively short dykes, most of which line the vent wall.
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