Age and regional significance of Brachiopods from the Temiscouata Formation of Madawaska County, New Brunswick

Auteurs-es

  • C. St. Peter New Brunswick Department of Natural Resources P.O. Box 60003Frederuston, N.B., Canada EZB 5H1
  • A.J. Boucot Department of Geology Oregon State University, Corvallis, Oregon* U.S.A. 97321

DOI :

https://doi.org/10.4138/1378

Résumé

The Lower Devonian Temiscouata Formation of Madawaska County, northwestern New Brunswick forms part of a more extensive slate belt that extends from eastern Gaspé Peninsula to Long Island Sound. The age of the basal beds of slates correlated with the Temiscouata Formation has been previously dated as New Scotland (late Gedinnian). Until now, the youngest age assigned to the slates has been Oriskany (late Siegenian) based on the brachiopod Leptoooelia flabellites. The discovery of two previously unreported genera in New Brunswick — Eodevonaria and Plioanoplia and the taxonoraic reclassification of Leptoooelia flabellites indicates that the Temiscouata Formation extends upwards into the Esopus or Schoharie (early to middle Emsian). Regional correlation fixes the upper age of the Temiscouata as pre-Onondagan (pre-Eifelian). The new age assignment allows the lower age limit of the Acadian Orogeny in this part of the Appalachians to be raised to post-Esopus or Schoharie time. RÉSUMÉ D'âge dévonien inférieur, la formation de Temiscouata (nord-ouest du Nouveau-Brunswick, comté de Madawaska) fait partie d'une vaste bande d'ardoises qui s'étend de l'est de la péninsule gaspésienne jusqu'au détroit de Long Island. Auparavant, on datait les couches d'ardoises basales, corrélatives avec la formation de Temiscouata, comme étant d'âge new Scotland (gédinnien tardif). Jusqu'à présent, base sur la présence du brachiopode Leptoooelia flabellites le plus jeune âge attribue aux ardoises était oriskany (siégénien tardif). La découverte de deux genres précedemment inconnus au Nouveau-Brunswick, Eodevonaria et Plioanoplia, ainsi que la reclassification taxonomique de Leptoooelia flabellites, prouvent que la formation de Temiscouata remonte jusqu'aux âges ésopus ou schoharie (bas à moxen emsien). Une corrélation régionale fixe l'âge supérieur de la formation de Temiscouata comme pré-onondagien (pré-eifelien). L'attribution de ce nouvel âge permet d'éléver la limite d'âge inférieure de l'orogenèse acadienne dans cette partie des Appalaches jusqu'aux temps post-ésopus ou schoharie. [Traduit par le journal]

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Publié-e

1981-05-05

Comment citer

St. Peter, C., & Boucot, A. (1981). Age and regional significance of Brachiopods from the Temiscouata Formation of Madawaska County, New Brunswick. Atlantic Geoscience, 17(2). https://doi.org/10.4138/1378

Numéro

Vol. 17 No. 2 (1981)

Rubrique

Articles

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