Zhuravlev, Andrey V.Sokiran, Elena V.Evdokimova, Irina O.Dorofeeva, Ludmila A.Rusetskaya, Galina A.Małkowski, Krzysztof2006Fig. 1. A in Faunal and facies changes at the Early-Middle Frasnian boundary in the north-western East European Platform10.5281/zenodo.13748783Fig. 1. A. Overview map of the studied Frasnian localities in the St. Petersburg region: 1, Stary Izborsk vicinity; 2, Porkhov town; 3, Il’men Lake area. B. Details of the borehole location in the Il’men Lake area (see Fig. 3).