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.
Onega Canal of the lake. At the mouth of the canal, in the selo of Voznesenye, a memorial obelisk has been erected. The canal lost its significance after Mariinsk Canal System was reconstructed and became Volga-Baltic Waterway. Onezhsky Canal was not reconstructed and became too shallow for larger boats. It is still navigable, but not used for regular navigation. Two rivers, Vozheroksa and Oshta, tributaries of Lake Onega, cross the canal. from the Vytegra, the canal crosses Lake Megrskoye, a large freshwater lake. There is weak current in the canal in the direction of the Svir. Onega Canal The Onega Canal ()