Caledogonia, a new smooth trigoniacean bivalve from the Triassic of New Caledonia
- 1 January 1977
- journal article
- research article
- Published by Taylor & Francis in Alcheringa: An Australasian Journal of Palaeontology
- Vol. 1 (3) , 279-291
- https://doi.org/10.1080/03115517708527764
Abstract
Caledogonia globosa gen. et sp. nov. is considered to be a member of the Myophoriidae following the classification of Newell & Boyd (1975). It is a more evolved genus than Agonisca Fleming from the Ladinian of New Zealand. Both are probably the descendants of Neoschizodus of the Andean-West Antarctic region, a dispersal route on the southern Gondwanaland coastline. Caledogonia was probably a rapid burrower in a high energy paleoenvironment. It occurs in a rhythmic sequence of greywackes and conglomeratic shell beds that lie on pre-Triassic basement. Like the associated bivalves, Maoritrigonia and Manticula, Caledogonia is an endemic genus of the Late Triassic Maorian Province. Caledogonia globosa gen. et sp. nov. est a rapporter aux Myophoriidae, d'après la classification de Newell & Boyd (1975). Plus évolué que le genre Agonisca Fleming du Ladinien de Nouvelle Zélande, il descend probablement, comme celuici de Neoschizodus représenté dans la region Andine et West Antarctique, zone de dispersion faunique de la cote Sud des Terres de Gondwana. Caledogonia, était un fouisseur actif dans un paléoenvironnement de haute énergie et de sédimentation rapide. On le trouve aujourdhui dans une séquence rythmique de grauwackes alternant avec des lumachelles et conglomérats, transgressive sur le substratum antétriasique. Comme les bivalves associés Maoritrigonia et Manticula, Caledogonia est un genre endémique de la province máorie du Trias supérieur.Keywords
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