sentences:  An arid phase followed, lasting from 100-90 kya with dunes building up in Southern Africa, followed by a short but intense cold stage from 75-58 kya.Near the end of this cold phase the first Heinrich event(H6) occurred, releasing a mass of ice into the north Atlantic 66 kya.This caused cooler temperatures in the northern hemisphere and a cooler Himalaya which probably resulted in a weakening of the monsoon.