鲁中地区早奥陶世早期头足类的发现

广泛分布于鲁西地区的白云岩,本世纪初至五十年代归属于奥陶系济南石灰岩的下部。1961年测制1/20万地质图时改称为冶里组,当时仅在安丘柿子园地区采到腹足类Ophileta,但其时代与对比还是以岩性及其上,下层位为主要依据,将不含燧石的白云岩与河北唐山地区的冶里组对比。陈均远和邹西平将这一部分白云岩称纸坊庄组第一段。笔者和安泰庠、王

DISCOVERY OF THE EARLIEST ORDOVICIAN CEPHALOPODA FOSSILS FROM CENTRAL SHANDONG

The cephalopoda fossils described in this paper were collected from the first member of the Zhifangzhuang Formation of Ezhuang, Zibo city and Xiaohuiquan of Juxianconnty, Shangdong Province. The discovery of Barnesoceras, Dakeoceras, Clarkoceras, etc. in the middle and upper parts of the first member of the Zhifangzhuang Formation is of great geologic significance becanse they are index fossils for the base of the Gasconadian Formation (Lower member of the Canadian )in North America. The age of Barnesoceras...