Abstract
Synopsis Serpentinites, spilites, rudites, arenites and black slates at the Highland Boundary between Loch Lomond and Aberfoyle display a complex history of sedimentation, alteration and tectonism. Fragmental serpentinites, probably of sedimentary origin, occur at Balmaha, Loch Lomond, and at two other localities at the Highland Boundary N and W of Kirriemuir. Cleaved arenites and rudites contain fragments of ultrabasic rock including silicified serpentinite. The serpentinites were not intruded into the Highland Boundary Fault-zone, but had a history of uplift, erosion and displacement prior to major faulting in the Devonian. Garnetiferous hornblende-schists near Aberfoyle are more highly metamorphosed and deformed than adjacent black slates and nearby Dalradian greywackes. Probably dynamothermal in origin, they resemble hornblende-schist slivers in the soles of allochthonous ophiolitic thrust-sheets. The diverse Highland Border rock-types probably formed in a restricted ocean basin and were brought into contact with the Dalradian by crustal shortening during the Grampian orogeny.
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