The coastline of southern Sinai Peninsula (Egypt) preserved belt of elevated fossil-reef terraces, up to 35m is fringed by a narrow belt of modern coral reefs. A well above mean sea level, stretches along the coast of southern Sinai. The terraces were mapped, named , dated and published by Gvirtzman, Kronfeld,and Buchbinder (1992, Mar.Geol, 108:29-37), Gvirtzman et al. (1997, Mem. DuBRGM, 89:480-491) and Gvirtzman (1994, Cor. Reefs, 13:203-214). According to these publication, the reefs fringed the coastline and were formed during four periods of high-stand sea-level of the global Milankovitch climatic cycles, namely: isotopic stages 7,5,3, and the older half of 1.

An another study by Klein Loya, Gvirtzman,sdale and Susic (1990, Nature, 345:145-147) these reefs were examined. Bands of alternating high and low density in massive coral species have been used to record their growth history. In the Red Sea,living colonies of the genus Porites deposite low-density skeletal bands during summer and high-density bands during winter. Additionally, yellow-green fluorescence can sometimes be seen in this massive corals, imparted to them by the incorporation of humic material carried by coastal runoff. Annual banding of fluorescent sequences in living scleractinian corals has proved to be useful in the study of terrestrial runoff in the near-shore environment. Here report the finding of similar yellow-green fluorescent bands in fossil Porites from Late Quaternary reef terraces in fluorescent bands in southern Sinai, which are absent from leaving Porites in the nearby living fringing reefs. The periodic sequences of the fluorescenting humics were found to be superimposed on the low-density sub-bands in fossil corals. The interpretation of these observations is an evidence that, during the Late Quaternary reef forming peaks, namely during the isotopic stages 1, 3, 5 and 7, the climate was wetter than the extreme desert condition now prevailing, with a possible summer monsoonal rainfall regime.

In conclusion, the present climate of the global desert belt is extremely dry, winter and summer. During the high-stand sea levels of Late Quaternary, the same belt was wetter, with monsoonal summer rainfall.