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.
Lake Kovzhskoye complex shape, with one bay in the south and one more bay (Lake Lozskoye, where the source of the Kovzha is located) in the southwest. From the north, Lake Kuzhozero is adjacent to Lake Kovzhskoye. The catchment area of Lake Kovzhskoye is relatively small, since the lake is located in the Andoma Hills. To the east of the lake, there is river basin of the Kema River, another tributary of Lake Beloye, and the areas to the north and to the west drain into Lake Onega. Two villages, Loza and Yakshino, are located on the southern shore of the lake.