Sedimentary and volcanic rocks crop out on the eastern shores of the Lake Ladoga in Russia. Among these are the "Salmi series" or "Salma suite" and the "Priosersk suite", which are Jotnian units. These rocks overlie the Salma rapakivi granite and igneous and metamorphic rocks of Paleoproterozoic age. Gritstone, sandstone and conglomerate are the sedimentary components of the Salmi suite which further includes mafic volcanic rocks. As with Satakunta and Muhos in Finland, the sediments at Lake Ladoga are located in a graben of Late Proterozoic age. The graben structure that hosts the sediments is known as the "Pasha–Ladoga structure", which is also in part a syncline, thus being referred to as graben-syncline. The maximum thickness of the pile of sediments is no less than 800 metres. Jotnian sediments are exposed only as small outcrops on land but exposures are larger at the lake bottom.
