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. Lake or marsh sediments in the Qa'a Jahran–Dhamār area indicate a period ofhigher moisture availability in the early Holocene of the highlands of Yemen.Forty-two marl–peat sediment samples from eight stratigraphic sections ofthat area have been collected and are examined for the first time for theirostracod associations. Eight species belonging to seven genera and fourfamilies are reported. Their ecological tolerances and preferences are usedto investigate the climatic and environmental changes in the early tomid-Holocene. Our data are compared and correlated with previousarchaeological results, particularly from the region of Qa'a Jahran (Dhamār)in the vicinity of the village of Beyt Nahmi. We conclude that the wettestperiod of the Holocene was from about 7900 to 7400 cal yr BP, whennorthwards incursion of the Indian Ocean Monsoon caused intensified monsoonprecipitation over southern Arabia.

A humid early Holocene in Yemen interpreted from palaeoecology and taxonomy of freshwater ostracods