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First report of protoceratopsians (Neoceratopsia) from the Late Cretaceous Judith River Group, Alberta, Canada

Publication: Canadian Journal of Earth Sciences
July 1998

Abstract

Protoceratopsians are best known in North America from associated skeletal material of Montanoceratops from the early Maastrichtian of Montana and Campanian of Alberta and Leptoceratops from the late Maastrichtian of Alberta and Wyoming. We report here the first occurrence of protoceratopsian elements from the middle Campanian (Dinosaur Park Formation) of Alberta. The specimens consist of a fragmentary right dentary and an almost complete left dentary which can be referred to Leptoceratops sp. Recent examination of Albertan microvertebrate material has identified cf. protoceratopsians teeth from the latest Santonian (Milk River Formation), extending the record of Albertan protoceratopsians back almost 20 million years. The rarity of these small ornithischians in the fossil record of Alberta may have been due to ecological exclusion from the wet, coastal environments that were preferred by the larger, more abundant ceratopsids.

Résumé

Les Protoceratopsiens sont particulièrement bien connus en Amérique du Nord du fait de leur association au matériel squelettique des Montanoceratops du Maastrichtien précoce dans le Montana et du Campanien en Alberta, et des Leptoceratops du Maastrichtien tardif enAlberta et dans le Wyoming. Nous décrivons ici la première découverte d'éléments protoceratopsiens datant du Campanien moyen (Formation de Dinosaur Park) en Alberta. Les spécimens sont constitués des fragments d'une dent du côté droit et d'une dent presque complète du côté gauche qu'on peut assigner à Leptoceratops sp. L'examen récent de matériel de microvertébrés cf. a permis d'identifier des dents protoceratopsiennes datant du Santonien terminal (Formation de Milk River), faisant reculer dans le passé le registre des protoceratopsiens albertains d'environ 20 millions d'années. La rareté de ces petits ornithischiens dans le registre fossile albertain est peut-être due à une exclusion pour des raisons écologiques, car les milieux humides et littoraux étaient préférés par les ceratopsidés plus gros et plus nombreux.[Traduit par la Rédaction]

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cover image Canadian Journal of Earth Sciences
Canadian Journal of Earth Sciences
Volume 35Number 7July 1998
Pages: 820 - 826

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Version of record online: 9 February 2011

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