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he nan zhou kou pen di zao bai zuo shi shang shui zu jie xing lei
Author(s): 
Pages: 415-423+460-462
Year: Issue:  4
Journal: Acta Micropalaeontologica Sinica

Keyword:  介形类组合周口盆地早白垩世登记号松辽盆地商水赛汉塔拉组灰色砂岩内蒙古二连盆地紫色泥岩;
Abstract: 本文首次报道了河南周口盆地商水组以Cypridea-Candona-Darwinula为代表的介形类化石组合。它由7属19种(包括5新种和1未定种)组成,其组合特征与国内外广泛分布的早白垩世非海相介形类化石组合特征相同。根据这一介形类化石组合中Cypridea(Pseudocypridina)占优势且出现较多的Candona,Candoniella属的分子,其时代应为早白垩世阿普第—阿尔必期。商水组的层位与河北南部丘城组和松辽盆地姚家组大体相当。
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