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Geological Society, London, Special Publications; 1986; v. 20; p. 221-236;
DOI: 10.1144/GSL.SP.1986.020.01.23
© 1986 Geological Society of London

Mode of secretion of graptolite periderm, in normal and retiolite graptolites

D. E. B. Bates & N. H. Kirk

Department of Geology, University College of Wales, Aberystwyth, Dyfed SY23 3DB, U.K.

The construction of graptolite periderm is discussed with particular reference to the rival extra-thecal tissue (secretion) and pterobranch (mortaring) models, and it is concluded that only the former model fits the observed structures. Evidence from a number of retiolite graptoloids demonstrates that they also have a continuous periderm, and were constructed in a similar manner.





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D. K. Loydell
Worldwide correlation of Telychian (Upper Llandovery) strata using graptolites
Geological Society, London, Special Publications, 1993; 70: 323 - 340.
[Abstract] [PDF]