Abstract
The Aral sea (located approximately 45°N-60°E), outlet basin of the Amu-Darya and Syr-Darya rivers, is similar to other basins enclosed by a desert area in that its level is very unstable. In the past, these rivers have been inconstant in the amount and direction of their flow; and thus, have played a considerable role in the sea-level fluctuation. Evidence of former, higher sea levels of the Ara] is indicated by its terraces, composed of sea sedimentation. The highest terrace is composed of gray sand, and shells of the mollusk Cardium edule. Below this there occurs a second terrace of light blue-gray carbonate loam; lower terraces of solonchak (salt marsh) extend to the Aral shoreline. Maximum elevation of past sea-levels, according to terrace elevations, was approximately 49 to 57 meters. Occurrence of freshwater mollusk shells of Anodonta with those of Cardium edule found in situ in alluvial deposits along the downstream channels of the Zhana-Darya river, indicate the frequent changes in regime of the ...
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