Mezen Bay Mezen Bay The Mezen Bay () is located in Arkhangelsk Oblast and Nenets Autonomous Okrug in Northwestern Russia. It is one of four large bays and gulfs of the White Sea, the others being the Dvina Bay, the Onega Bay, and the Kandalaksha Gulf. The Mezen Bay is the easternmost of these, as it lies to the south of the Kanin Peninsula. Morzhovets Island lies at the entrance of the bay. The two main rivers emptying into the Mezen Bay are the Kuloy River, and the Mezen River. The area of the bay is . The Mezen Bay is long
Onega stepanovi placed in phylum Proarticulata, as the segments in recently discovered, exceptionally well-preserved fossils display the glide, or "staggered", symmetry characteristic of the majority of proarticulatans. Imprints of "Onega stepanovi" have been found in the Verkhovka and Zimnie Gory Formations of the Ediacaran (Vendian) rocks of the Arkhangelsk Region, Russia. All the fossil specimens are negative imprints on the bases of fine-grained sandstone beds with the "elephant skin" and tubercle texture diagnostic of microbial mats. The same bedding planes contain various other Ediacaran species: "Cyclomedusa", "Ediacaria", palaeopascichnids, "Eoporpita", "Yorgia", "Andiva", "Archaeaspinus", "Vendia", "Dickinsonia", "Anfesta", "Albumares", "Tribrachidium", "Kimberella", "Parvancorina", "Charniodiscus" and others.