海拉尔盆地介形类化石组合及其生物地层特征

本文简要概述了海拉尔盆地的沉积特征及其地层层序，深入分析了介形类化石纵、横向展布规律，建立了5个化石组合序列：1．Limnocypridea subscalara-Hailaeria dignata组合；2．Cypridea badalahuensis-Hailaeria cretacea组合；3．Ilyocyprimorpha hongqiensis-Rhinocypris rivulosus组合；4．Altanicypris obesa-Talicypridea triangulata组合；5．Chinocypridea augusta-T alicypridea qingyuangangensis组合。进而根据介形类组合及其分布特征，讨论了介形类化石的生物地层特征及其在地层划分对比中的重要意义。

THE CRETACEOUS OSTRACODA ASSEMBLAGES AND ITS BIOSTRATIGRAPHIC CHARACTER ISTICS IN THE HAILAER BASIN

This paper briefly introduces the sedimentary character istics and stratigraphic sequence in the Hailaer Basin. Based on the composition and distribution of ostracode species, five ostracoda assemblages have been identified: 1. Limnocypridea subscalara-Hailaeria dignata assemblage; 2. Cypridea badalahuensis-Hailaeria cretacea assemblage; 3. Ilyocyprimorpha hongqiensis-Rhinocypris rivulosus assemblage; 4. Altanicypris obesa-Talicypridea triangulata assemblage; and 5. Chinocypridea augusta-Talicypridea qingyuangangensis assemblage. According to the materials of ostracods and their distribution, we described the biostratigraphic features and pointed out their significance in stratigraphic subdivision and correlation in the Hailaer Basin.