Fossils and tectonics along the Highland Boundary Fault in Scotland

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Abstract
The tectonic significance of fossil discoveries from the Highland Border Complex of Scotland is described. These sparse but diverse macro- and microfossils have been recovered from a wide range of lithologies across Scotland, and range in age from early to late Ordovician, thereby refuting any attempt to incorporate the HBC within the Dalradian Supergroup. The Lower Cambrian trilobite fauna from the Leny Limestone could represent an isolated remnant of an early development of the Ordovician HBC basin(s), or alternatively may provide an upper age limit for Dalradian sedimentation. Further palaeontological prospecting in the zone, especially in relatively undeformed late Dalradian sediments, could resolve this and other problems which complicate the regional tectonic interpretations.

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