Hostname: page-component-78c5997874-94fs2 Total loading time: 0 Render date: 2024-11-12T21:32:36.166Z Has data issue: false hasContentIssue false
  • English
  • Français

On a varcus Zone conodont fauna from the Ilfracombe Slates (Devonian, North Devon)

Published online by Cambridge University Press:  01 May 2009

M. J. Orchard
M. J. Orchard
Affiliation:
Sedgwick Museum Cambridge
Get access Rights & Permissions [Opens in a new window]

Summary

Several conodont faunas from the Ilfracombe Slates are described and their age discussed. One is referred to the conodont zone of Polygnathus varcus (late Givetian-early Frasnian). The conodonts, the first from the Devonian of North Devon, indicate that, in terms of the German standard, the uppermost Ilfracombe Slates are no younger than basal Manticoceras Stufe in age. The position of the Middle/Upper Devonian boundary within the North Devon sequence is discussed with reference to the limestones of the Combe Martin Slates (the ‘Ilfracombe limestones’), which are regarded here as Middle Devonian in age.

Type
Articles
Information
Geological Magazine , Volume 116 , Issue 2 , March 1979 , pp. 129 - 134
Copyright
Copyright © Cambridge University Press 1979

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Bultynck, P. 1970. Révision stratigraphique et Paléontologique (Brachiopodes et Conodonts) de la Coupe type du Couvinian. Mém. Inst. geol. Univ. Lourain 26.Google Scholar
Bultynck, P. 1972. Middle Devonian Icriodus assemblages (Conodonta). Geol. Paleontol. 6, 71–86.Google Scholar
Bultynck, P. 1975. Conodontes de la Formation de Fromelennes du Givetien de l'Ardennes Franco-Belge. Bull. Inst. r. Sci. nat. Belg. 50 (10), 1–30.Google Scholar
Bultynck, P. 1976. Comparative study of Middle Devonian conodonts from North Michigan (U.S.A.) and the Ardennes (Belgium-France). Spec. Pap. geol. Soc. Can. 15, 119–41.Google Scholar
Bultynck, P. & Holland, H. (in press). Distribution comparée de conodontes et goniatites Devoniens des plaines du Dra, du Ma'der et du Tafilalt (Maroc). Bull. Inst. r. Sci. nat. Belg.Google Scholar
Garcia-Lopez, S. 1976. La Caliza de Candas en la Zona de Luanco (Asturias) y su contenido en conodontes. Trabajos de Geologia 8, 173–85.Google Scholar
Holwill, F. J. W. 1962. The succession of limestones within the Ilfracombe Beds (Devonian) of North Devon. Proc. Geol. Ass. 73, 281–93.CrossRefGoogle Scholar
Holwill, F. J. W. 1964. The coral fauna from the Ilfracombe Beds of North Devon. Proc. Ussher Soc. 1, 126–9.Google Scholar
Holwill, F. J. W. & House, M. R. 1969. Summer (1966). field meeting in Devon and Cornwall. Proc. Geol. Ass. 80, 43–62.CrossRefGoogle Scholar
House, M. R. 1975. Facies and time in Devonian tropical areas. Proc. Yorks. geol. Soc. 40, 233–87.CrossRefGoogle Scholar
House, M. R., Richardson, J. B., Chaloner, W. G., Allen, J. R. L., Holland, C. H. & Westoll, T. S. 1977. A correlation of Devonian rocks of the British Isles. Spec. Rep. geol. Soc. Lond. 7.Google Scholar
House, M. R. & Ziegler, W. 1977. The goniatite and conodont sequences in the early Upper Devonian at Adorf, Germany, Geol. Paleontol. 11, 69–108.Google Scholar
Klapper, G., Philip, G. M. & Jackson, J. H. 1970. Revision of the Polygnathus varcus Group (Conodonta, Middle Devonian). Neues Jb. Geol. Palaont. Mh. 11, 650–67.Google Scholar
Lecompte, M. 1968. Le Devonien de la Belgique et le nord de l62a France. In International Symposium on the Devonian System 1, 15–52, (ed. Oswald, D. H.).Google Scholar
Orchard, M. J. 1978. The conodont biostratigraphy of the Devonian Plymouth Limestone (South Devon). Palaeontology 21, 907–55.Google Scholar
Scrutton, C. T. 1975. Preliminary observations on the distribution of Devonian rugose coral faunas in south-west England. In Drevnie Cnidaria 2, 131–40 (ed. Sokolov, B. S.). Novosibirsk.Google Scholar
Van Adrichem Boogaert, H. A. 1967. Devonian and Lower Carboniferous conodonts of the Cantabrian Mountains (Spain) and their stratigraphic application. Leid. geol. Meded. 39, 129–92.Google Scholar
Webby, B. D. 1966. Middle-Upper Devonian palaeogeography of North Devon and West Somerset, England. Palaeogeogr. Palaeoclimat. Palaeoecol. 2, 27–46.CrossRefGoogle Scholar
Wirth, M. 1967. Zur gleiderung des hoheren Palaozoikums (Givet-Namur) im Gebiet des Quinto Real (Westpyrenaen) mit hilfe von conodonten. Neues Jb. Geol. Palaont. Abh. 127, 179–244.Google Scholar
Ziegler, W. (ed.) 1975. Catalogue of Conodonts II. Stuttgart.Google Scholar
Ziegler, W. & Klapper, G. 1976. Redefinition and subdivision of the varcusZone (conodonts, Middle- & ?Upper Devonian) in Europe and North America. Geol. Palaeontol. 10, 109–40.Google Scholar