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The Proximal End of Cryptograptus

Published online by Cambridge University Press:  01 May 2009

O. M. B. Bulman
O. M. B. Bulman
Affiliation:
Sedgwick Museum, Cambridge.
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Extract

It has long been suspected that the mode of development of the proximal end in Cryptograptus may differ considerably from the ordinary Diplograptid type, but the preservation of the material has hitherto been too poor to allow of a complete interpretation. Amongst the graptolites preserved in impure limestone nodules1 in the Balclatchie Shales at Laggan Burn, near Girvan, Cryptograptus tricornis is abundant, and despite the extreme tenuity of the periderm, specimens can be dissolved out with HC1 and HF, in a remarkably good state of preservation.

Type
Original Articles
Information
Geological Magazine , Volume 75 , Issue 12 , December 1938 , pp. 539 - 543
Copyright
Copyright © Cambridge University Press 1938

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References

page 539 note 1 I am most grateful to Dr. John Pringle, who has collected and given to me a large quantity of this limestone. At his request, I shall present all figured material to the Geological Survey Museum; the specimens shown in Text-figs. 1 and 3 bear my temporary numbers.Google Scholar

page 542 note 1 Hadding, A., 1915, “Om Glossograptus, Cryptograptus och tvenne dem närstående Graptolitsläkten,” Geol. Fören. Förk., Bd. xxxvii, p. 304.Google Scholar