We present new data on the age of zircon of the pre-Jurassic basement of quartz monzodiorites Shaimsk-Kuznetsovsk meganticlinorium West Siberian megabasin. It is established that they have Late Carboniferous age, which is fully consistent with U-Pb-dating of previously studied granosy enites. The new data allow us to speak with greater certainty’ that the introduction of individual subalkaline monzodiorite-granosienite arrays Shaimsk-Kuznetsovsk meganticlinorium occurred in the Late Carboniferous.