N. N. Bogolobuv

Academic paper

Yezregodneek Geologhee i Meeneraloghee Rossiee

14

174-176

It has been known for a long time that the surface deposits of North America contain a rich and varied fauna of plesiosaurs. Through the works of Leidy, Cope, Marsh, and other American paleontologists, there are established 17 genera and more than 30 different species, most of which are found in the Upper Cretaceous Period. Because of the desultory unsystematic character of paleontological literature, and also because of the insufficiency of many of the findings, thus far it has been most difficult to render a judgment in the matter of the American plesiosauri. The works of American paleontologists have, for a long time, failed to find their merited esteem in Europe. For some time Williston has been doing work in re-examining and studying all remains of plesiosaurs found in North America. With the work of Williston(1) begins a new epoch in the study of Upper Cretaceous plesiosaurs, and there is opened up the possibility of comparing the American fauna with the European fauna. As one of his tasks, Williston sets * Original citation: Bogolyenboff [Bogolubow], N. N. 1912. Sur la présence de l�Elasmosaurus et du Polycotylus dans les dépots de la Russie. Yezregodneek Geologhee i Meeneraloghee Rossiee [Annuaire Geologique et Minéralogique de la Russie] 14:174-176. Translated by William Wist. Generously donated by the Museum of Paleontology, University of California, Berkeley and courtesy of Patricia Holroyd and William Clemens. Original typescript transferred to electronic format and edited by Matthew Carrano, Smithsonian Institution, October 2006. (1) S. Williston. North American plesiosaurs. Part 1. Field Columbian Museum Publication 73. Chicago. 1903. � N. American plesiosaurs: Elasmosaurus, Cimoliasaurus, and Polycotylus. The American Journal of Science 1906, v. 21. � The skull of Brachauchenius. Proceedings of the United States National Museum of Natural History, v. XXXII; 1907. � N. American plesiosaurs: Trinacromerum., Journal of Geology 1908, v. 16. out to give a detailed and definite analysis of the genera, according to complete skeletons. His studies, however, are not completed, and at present it cannot be said how many genera and species he will finally differentiate in the make-up of the American Upper Cretaceous fauna. Up to the present time he has succeeded in giving the characteristics of the following Upper Cretaceous genera:(2)

English (Translated from Russian)