粤西怀集盆地白垩系马屋组的介形类化石

FOSSIL OSTRACODA FROM THE CRETACEOUS MAWU FORMATION IN THE HUAIJI BASIN,WESTERN GUANGDONG

依据闸岗剖面地表及钻井样品的分析鉴定,粤西怀集盆地白垩纪闸岗群马屋组产介形类化石10属17种,本文描述其中9属14种,包括1新种。介形类组合以Eucypris最繁盛,次为Ziziphocypris和Darwinula,称Eucypris hubeiensis-Ziziphocypris simakovi-Darwinula leguminella组合。马屋组与湖北贾店组的介形类组合面貌非常相似,可以进行对比,层位大体相当,其时代应属早白垩世最晚期(Albian)-晚白垩世早期(Cenomanian)。

The Cretaceous ostracods has been collected from 22 samples of borehole and outcrop of the Mawu Formation in the Huaiji Basin,western Guangdong.Totally 17 ostracod species in 10 genera have been recognized,and out of which 14 species in 8 genera are figured here,including one new species.The most common genera are Eucypris,Zizi-phocypris and Darwinula,named Eucypris hubeiensis-Ziziphocypris simakovi-Darwinula leguminella assemblage.The ostracod assemblage of the Mawu Formation is very similar to that of the Jiadian Formation in Hubei.They are roughly equivalent in horizon,and should be ascribed to the latest Early Cretaceous—early Late Cretaceous（i.e.,Albian—Cenomanian）in age.