THE DISCOVERY OF CONODONT SULCATA-ZONE AND PRAESULCATA-ZONE IN CHINA, AND THEIR STRATIGRAPHIC VALUE
THE DISCOVERY OF CONODONT SULCATA-ZONE AND PRAESULCATA-ZONE IN CHINA, AND THEIR STRATIGRAPHIC VALUE
牙形类Siphonodella puaesulcata带和S.sulcata带在我国的发现及其意义
THE DISCOVERY OF CONODONT SULCATA-ZONE AND PRAESULCATA-ZONE IN CHINA, AND THEIR STRATIGRAPHIC VALUE
牙形类Siphonodella puaesulcata带和S.sulcata带在我国的发现及其意义