This paper considers the composition, structure, spatial location, and paleotectonic conditions of formation of Precambrian rocks in the Tien Shan and adjacent regions analogous to the Sinian complex in China and the Tamian-Vendian strata of the cover of the Russian Platform. A model is proposed for the Precambrian evolution of the Central Asian ocean basin with pre-Sinian accretion and Vendian orogeny. The major events are dated as follows: subduction and continental-margin volcanism – to 830 ± 30 Ma, pre-Sinian accretion – to 700 ± 20 Ma, rifting – to 700–650 Ma, and orogeny – to 650 ± 10 Ma.
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