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FIGURE 6 Common trace fossils from the Volkhovian (Dapingian) of the St. Petersburg region,
Russia. Scale bars ¼ 1 cm. (A) Vertical section of the “Steklo” hardground (Zeliony Bed) with Gas-
trochaenolites oelandicus filled with glauconite grains, Putilovo quarry. (B) G. oelandicus penetrat-
ing carapaces of the trilobite Megistaspis estonica , Zeliony Bed, Kingisepp quarry. (C) Hardground
surface in the Zhelty Bed (Dikari unit) with grooves and openings of Balanoglossites triadicus
(arrows) and Trypanites isp. on the ridges, Babino quarry. (D) Vertical section with the same hard-
ground as in C, revealing a complex B. triadicus ichnofabric, Babino quarry. (E) Vertical section
between the Krasnenky and Melkotsvet beds displaying a firm- to hardground with U- and Y-shaped
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