与大荔人头骨化石共生的双壳类化石及其环境意义

The environmental significance of the fossil bivalve in association with Dali Man Skull

记述了与大荔人头骨化石共生的双壳类化石 3属 1 2种。通过与现生的相近双壳类生活环境的对比 ,得出大荔地区当时的气候环境主要受夏季风控制的暖湿气候的结论。结合对沉积特征的分析 ,引出了对该地区地貌演化模式的讨论。

Three genera and twelve species of fossil bivalve are described, which are in association with Dali Man skull.They are: Lamprotula chiai, Lamprotula rochechouarti, Lamprotula bazini, Lamprotula cf. Bazini, Lamprotula ambigua, Lamprotula polystictus, Lamprotula cf. polystictus, Lamprotula antiqua, Lamprotula plana, Lamprotula wangi and Unio sculptus . A comparative study and analysis of those fossil bivalve lead to the following conclusions. (1)The environment when Dali Man lived was warm and wet climate like that of the middle and lower reaches of Changjiang river today. And that might be a monsoon climate controlled by summer monsoon. (2)There must be a strong water power in Luohe river at that time when Dali Man lived because the gravel at the lower stratum is so big. But it still deposit such thick sediment which is more than 20 m high. That could be a circumstantial evidence of the difference between China(especially in the Chinese Loess Plateau ) and Europe(that was deeply affected by glaciation during Quaternary) on the model of deposit in Quaternary.