The chane of sedimentary facirs from aeolion to fluvial thcn to lacustinc origins synchronusly coincied with the changc of climate from dry-cold cold-moist to warm moist.

• 该剖面的沉积物大致以风成砂、河流沉积、湖泊沉积旋回叠覆与气候干冷、冷湿、温湿趋于同步变化的模式。