TY CONF TI Teaching the Specifics of the Engineering and Geological Conditions of St. Petersburg by the Method of Analogies KW geology KW Proterozoic KW Quaternary KW Cenozoic era KW geochronological scale JO VII Betancourt International Engineering Forum AU Sokornov, A.A. PY 2026 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"