Sirs — Graptolites of Arenig age have been discussed repeatedly from the Ballantrae Complex (Stone & Strachan 1981; Stone & Rushton 1983, 2003; Rushton et al. 1986; Rushton & Stone 1988). The inferred bios-tratigraphic ranges were estimated to be from the basal Arenig Tetragraptus approximatus Biozone to the early Yapeenian. As the exact dating of the graptolite faunas in this sequence has some important implications for the interpretation of the tectonic development of the region, precision is relevant to the question.

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The discovery of Arenig isograptid faunas in the North Ballaird borehole (Stone...

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