(1946). A Monograph of the Caradoc (Balclatchie) Graptolites from Limestones in Laggan Burn, Ayrshire. Part II. Pages 43–58 Plates IV–VI. Monographs of the Palaeontographical Society: Vol. 99, No. 433, pp. 43-58.
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O. M. B. Bulman (1945) studied this question.
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