Abstract
The Caspian Sea is located within the Precambrian Russian and epi-Hercynian Scythian platform and Alpine geosynclinal province. Marine geophysical methods (seismic gravity, magnetic, and electrical) have added many details about its structure and salt tectonics. The ancient age of the Caspian central massif is supported by relationships between the Karabogaz arch and Turkey meganticline. Basically the south Caspian represents a remnant of the ancient Thetis trough; the middle and north Caspian are epiplatforms: The western part is associated with a post-Alpine platform and its foredeeps, with the middle Caspian only recently involved in its subsidence. A series of maps are given, showing the results of various marine geophysical studies. C. E. Sears
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