A high resolution, AMS (super 14) C-dated sediment record from the Sulu Sea clearly indicates the Younger Dryas climatic event affected the western equatorial Pacific (Linsley and Thunell 1990). Presence of the Younger Dryas in the tropical western Pacific indicates this climatic event is not restricted to the North Atlantic nor to high latitudes, but is global in extent. In addition, the planktonic delta (super 18) O record and bulk CaCO (sub 3) records both reveal millennial-scale variability. Spectral analysis of the delta (super 18) O record shows increased variance at 2.5 Ka. The CaCO (sub 3) accumulation rate record also shows increased variance at 2.5 Ka and at 3.5 Ka, with the 2.5 Ka cycle dominant after about 13 Ka. Similar approximately 2.5 Ka millennial climatic cycles have been recorded in late Pleistocene delta (super 18) O records from the Indian Ocean, Quaternary continental and alpine glaciers, Holocene tree rings, and in Permian varved evaporite deposits, suggesting that about 2.5 Ka is an inherent climatic rhythm. The Younger Dryas occurs within these millennial cycles, suggesting its occurrence in the Indonesian tropics may be an expression of a 2.5-Ka millennial-scale climate cycle. In this context, the Younger Dryas is not unique, but apparent in numerous paleoclimatic records due to the rapid climatic change during the last deglaciation.