¹ It may he noted that the repetition of the Jurassic Strata at Sviati Gori, at Kamenka, and at Tzium, is regarded by Prof. Gourov as being due to a succession of faults. It again raises the question how far parts of the courses of important rivers have been determined by such movements of the earth's crust. Prof. Gourov has shown the existence of Jurassic limestones not far from Poltava, so that it is probable that Upper Cretaceous beds do not extend far to the S. of that town.

² At Fedorovka, in the Izium district, a boring by Messrs. Winning, has shown the existence of 451 feet of variegated, green, and red clays, which probably belong to the same category as those mentioned above. At a bore between Barvenko and Stavrikov, in the valley between the stations of Gavrilovka and Slaviansk, the beds vary remarkably in their lithological character. For the first 50 feet variegated and brown clays predominate; the next 150 feet are sands and sandstones. For the next 100 feet there is contest between the clays, sandstones and limestones, the latter forming two or three bands 6 ft. thick, separated by wide intervals. The remaining 22S feet are almost entirely variegated brown clays. It is possible that these beds were deposited near a shore line, the sea, in which the Oolitic limestone of Sviati Gori was laid down, occasionally reinvading the district. Subsequently the clays themselves invaded the Jurassic sea, and covered the limestones, as at Sviati Gori.