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 Kenozero shape is determined by the fact that Lake Kenozero is located in the rift of the earthcrust, in contrast to other lakes in Kenozersky National Park, all of them being of glacial origin. There are over 70 islands on Lake Kenozero. Until the 1990s, the lake served for timber rafting. The rafts were made in the course of the Undosha and the destination was the Onega. There are a dozen of villages at the lakeshore, the biggest of which are Vershinino and Pershlakhta. The road connects the northern shore (in particular, Ust-Pocha, Vershinino, and Pershlakhta) with "Onezhsky Trakt", the road