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- Volume 95 (1972)
- Fascicule 2
- The origin and evolution of the middle Dinantian conodont genera Doliognathus, Dollymae, Scaliognathus, and Staurognathus, and related forms
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The origin and evolution of the middle Dinantian conodont genera Doliognathus, Dollymae, Scaliognathus, and Staurognathus, and related forms
Résumé
Le Dinantien moyen se caractérise, en de nombreux endroits de la Terre, par la présence de divers genres de conodonte : Doliognathus Branson et Mehl, Dollymae Hass, Scaliognathus Branson et Mehl, Staurognathus Branson et Mehl et Bactrognathus Branson et Mehl. L'origine et l'évolution de ces différents genres sont retracées à partir d'exemples provenant du Tournaisien supérieur de la Belgique. De nouvelles faunes provenant de la Carrière Lambert, du Rocher Bayard et du Rocher du Bastion sont citées et figurées. Une comparaison est faite avec d'autres parties du globe.
Abstract
Spathognathodus bultyncki Groessens evolved from Prioniodina prelaevipostica Rhodes, Austin, and Druce and gave rise to Dollymae bouckaerti Groessens. The genus Scaliognathus Branson and Mehl developed from D. bouckaerti by closure of the basal cavity. Doliognathus Branson and Mehl developed from either S. bultyncki or Scaliognathus. Dollymae sp. A Voges evolved from Pelekysgnathus sp. A Voges. The New Genus B of Groessens also evolved from Pelekysgnathus sp. A. New Genus B was the forerunner of the genus Staurognathus Branson and Mehl. The origin of these distinctive conodonts is shown from examples found in the Tournaisian Tn3c rocks of Belgium. New faunas from the Rocher Bayard and from the section between the quarry Lambert and the Rocher du Bastion are mentioned. The conodont sequence described is compared with those from other areas of the world.