Abstract
This work describes clastic dikes which intruded along cleavage planes into Lower Vendian clay shales of the Barakun Formation (the eastern part of the Patom folded zone). Dikes are composed of sandstones, which are common in other parts of the Barakun Formation, or more often by thin intercalations of finely oolitic limestones in surrounding shales. It is evident that dikes were formed as a result of elision processes synchronous to the folding, the major system of cleavage planes, and dehydration of clayey rocks of the Dalnetaiginsky Group at the end of Early Vendian. This stage of folding can be considered as one of the first phases of the Baikal folding by N.S. Shatsky.
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