In his report on the geology of Webster county F. A. Wilder mentions the presence of a shaly marl rich in fossils, which he includes with the St. Louis limestone. The writers have had the opportunity of examining a number of out crops of these shaly marls and a study of the fossils collected from them has corroborated the conclusion reached, apparently somewhat tentatively, by Weller and Van Tuyl, that they are Ste. Genevieve in age. Because of this determination it seems worthwhile to call attention to the character and distribution of these beds and to their contained fossils.