苏皖地区早志留世坟头组腹足类

记述苏皖地区坟头组腹足类１１属１２种，其中Ｕｍｂｏｎｅｌｌｉｎａ ｃｆ．ｇｌｏｂｕｌｏｓａ Ｙｕ，Ｒａｐｈｉｓｔｏｍｉｎａ ｒｈｏｍｂｉｓｔｏｍａ Ｙｕ，Ｔｒｏｃｈｏｎｅｍａ ｃｆ．ｆｒａｇｉｌｅ Ｕｌｒｉｃｈ ｅｔ Ｓｃｏｆｉｅｌｄ常见于西南地区早志留世秀山组、上翁项群及石牛栏组。坟头组上段所产的三叶虫Ｃｏｒｏｎｃｅｐｈａｌｕｓ，Ｋａｉｌｉａ；头足类Ｓｉｃｈｕａｎｏｃｅｒａｓ；腕足类Ｓａｌｏｐｉ

RADIOLARIA AND CORRELATION STUDY OF TERRANES

As a kind of pelagic, planktonic, monocell microfossil with siliceous skeleton and shell, the Radiolaria are widely distributed with a great value in regional correlation. The studies of radiolarian fossils serve as a new way determining the age of strata and have made important contributions to investigation of structural active belts. Researches on radiolarian fossils in western North America and the Circum-Pacific region have defined the strata sequence and tectonic evolution in these areas. Therefore, the study of radiolarian fossil is not only a single subject in palaeontology, but also an indispensable and invaluable method in stratigraphy and tectonics. Especially, the research on characteristics and correlation of radiolarian fossils between the Nadanhada terrane, North China and the Mino terrane, Japan has played a key role in analyzing the tectonic evolution of both terranes.