In a recent paper I figured some examples of the graptolite Dicellograptus alabamensisRuedemann, 1908, from the Superstes Mudstone Formation in the Girvan cover-sequence, and used that species to support the inference that the formation lies in the lower part of the gracilis graptolite zone (Rushton 2001, p. 49, fig. 2b-g). However, one figured specimen (Rushton 2001, fig. 2b) appears to have been incorrectly identified, and should rather be referred to Dicranograptus irregularisHadding, 1913.

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The outline of the specimen in question, British Geological Survey GSE 8213 (Fig. 1a), shows what appears...

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