No CrossRef data available.
We use cookies to distinguish you from other users and to provide you with a better experience on our websites. Close this message to accept cookies or find out how to manage your cookie settings.
We use cookies to distinguish you from other users and to provide you with a better experience on our websites. Close this message to accept cookies or find out how to manage your cookie settings.
In the summer of 1891 a journey was undertaken by the writer to the S.W. Governments of Russia, the immediate object in view being the study of the geology of that region. This portion of the notes then taken will deal more especially with the extent, thickness, and general contour of the Cretaceous beds of the district, together with a review of the Eussian literature bearing on the zonal distribution in the various Governments.
In 1845 Murchison had gathered together most of the facts then known regarding the Cretaceous formation of S. Russia, but his own direct observations were few, and the work was considered of only secondary importance. Under these circumstances it would not have been very surprising to find that he had fallen into error on many points.
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.