STRATIGRAPHY Luchinina V.A., Sipin D.P.,Korovnikov I.V., and Fedoseev A.V. The lower and upper boundaries of the Lower Cambrian on the Siberian Platform 1233
PETROLOGY, GEOCHEMISTRY, AND MINERALOGY Distanova A.N. Early Paleozoic granitoid associations of the Altai-Sayan folded area: Their types and importance in paleogeodynamic reconstructions 1244 Konnikov E.G. Distribution of admixture elements in sulfides and norites of the Elan intrusive body (Voronezh Crystalline Massif) and genesis of boninite-like magmas 1258 Shaporina M.N. and Popov N.V. Gold-bearing metasomatites of the Olondo greenstone belt (Aldan Shield) 1268 Vorob'ev E.I. Exsolution in natural carbonate systems 1274 Bryksina N.A., Sheplev V.S., Ripinen O.I., Halden N.M., Campbell J.L., and Teesdale W.J. Oscillatory zoning in agate: Qualitative analysis of the Wang-Merino dynamic model and quantitative estimates of trace-element distribution in a sample from Arc-Bogdo (Mongolia) 1287 Serdobintseva V.V. and Kalinin D.V. The mechanism of supramolecular crystallization in suspensions of monodispersed silica spheres during the formation of precious opal 1298 Golubev V.S. Role of biota in geochemical evolution and Earth's crust energetics 1306 Kosov A.A. Age estimates of deep-water bottom sediments of Lake Baikal from uranium-series disequilibrium 1313GEOPHYSICS Bakhterev V.V. Temperature-dependent resistivity variations in serpentinites from the Bazhenov deposit (the Urals) 1325 Khachai O.A., Novgorodova E.N., and Khachai A.Yu. Areal surveys in the mapping of three-dimensional conductors using 3D frequency-geometrical technology 1331
BRIEF COMMUNICATIONS
Zamirailova A.G., Zanin Yu.N., and Fomin A.N. Sapropelic coal in the Bazhenov Formation of the West-Siberian Plate 1341