The quaternary environmental evolution of the beijing plain region mainly depends upon the neotectonics and palaeoclimatic changes , which controlled and influenced the distribution , evolution of depositional areas and uplifting erosional areas and changes of sedimentary types , and also the scale and scope of quaternary transgressions 冷暖交替的軟體動物組合,反映了本區(qū)第四紀時古氣候的變動特點。北京?通縣平原地區(qū)的第四紀環(huán)境演變,主要取決于氣候變化和新構造運動。