北海道釧路町古第三紀バク類(奇蹄目)の 1 新種と浦幌層群の地質時代

概要

論文の詳細を見る
Colodon kushiroensis sp. nov. is described from northern Japan based primarily on its non-molariform upper premolars and its large size. C. kushiroensis is morphologically most similar to C.? hancocki known from the Chadronian of western North America. Although the close morphological similarity does not by itself indicate their definite age relationship, if it is accepted, the geologic age assignments of the Urahoro Group based on the mammalian fossil (Chadronian in North American "scale") and on the megaflora (Kummerian-"Goshen type" in North American "scale") are consistent with each other. The correlation of these North American "scales" to the European standard is presently unsettled, but an early Oligocene age for the Urahoro Group is tentatively assigned.
国立科学博物館の論文
1983-12-22