бетон блокийн үйлдвэрийн ТЭЗҮ. бетон блокуудын ТЭЗҮ. бетон блокуудын ТЭЗҮ Baykonurian glaciation - Wikipedia The Baykonurian glaciation is a glacial episode dating to around the Proterozoic–Phanerozoic boundary – precise dates are difficult to constrain but has been proposed — and thus posited as a contributor to the Cambrian ...