The section of the Devonian deposits at the Borschovo Village near the Oredezh River has been known since works of Dmitry Obruchev (Obruchev 1933).
The deposits corresponding to various Middle and Upper Devonian stratigraphic units are exposed in several picturesque outcrops along the Oredezh River, the right bank tributary of the Luga River, Luga District, Leningrad Region (Fig.
Slightly more than 100 m to the northwest of this object, in several artificial caves directly on the left bank of the Oredezh River, white sandstones of a slightly older interval of the Devonian were documented.
It is represented by a series of outcrops on the south bank of Lake Antonovskoe, in the Oredezh
River basin (Fig.
1C) includes some outcrops on the left bank of Lake Antonovskoe, downstream of the Oredezh River.
1C) is a long cliff on the right bank of the Oredezh River near the village of the same name.
Razrez po ruch'yu Tesovoj, pritoku Oredezha [Geological section on the Creek Tesovoj, River Oredezh affluent].
The locality is situated on the right bank of the Oredezh
River, in Siverskij village, near Siverskaya railway station, at the dam of a former hydroelectric power station (Fig.
Obruchev (1933) concluded that the Podsnetogor Beds could also be included into the Upper Devonian and the underlying Oredezh Beds into the Middle Devonian.
Recent data show that two localities with the characteristic Burtnieki fish fauna occur in the basins of the Luga and Oredezh rivers, to the NE of the town of Luga.
It was decided that the boundary should be above the Oredezh Beds, the age equivalent of the Gauja Fm.