234 
SECTION AT INKINO ON THE OKA. 
a. Sliale and sands, b. Black shale, with calcareous concretions and fossils, c. Thickly laminated sandy marl 
and greensand, d. Dark shale, e. Yellowish ferruginous sands, with concretions of calcareous grit or sandstone 
loaded with Ammonites, Belemnites, and other fossils. /. Dark-coloured marls, followed by others of yellowish 
tint and sandy and ferruginous structure, with courses of marlstone, &c. These regular beds are covered by argil- 
laceous drift (o), which for the most part obscures the section. 
The fossils found midway in this cliff are clearly those of the Kelloways rock 
of England or lower beds of the Oxford group, viz. Ammonites Gulielmi (Sow\), 
A. peregrinus (D’Orb.), allied to A. Lumber ti (Sow.), A. Fournetianus (D’Orb.), and 
Grypheea dilatata, which occur generally through the lower Oxford oolite of France 
and England. With these are found three species of Belemnites, a Mya resem- 
bling My a depressa ?, Terebratula allied to T. socialis, w r ith unpublished Corbulze, 
Pectens, Serpulae, which will be described in the sequel. 
The river banks which expose these beds of the middle oolitic group, are within 
three miles of the iron-works on the cliffs of the little river Unja ', on which we 
have described the carboniferous limestone (p. 84.) ; and from the beds being 
horizontal, it is almost certain that these rocks, though of such dissimilar age, 
must, if their relations were seen, be in contact as at Moscow, without the inter- 
vention of any other strata. In other words, we thus learn, that the edges of the 
great red (Permian) basin have here thinned out ; for the fundamental rock near 
Jelatma, as already shown, is the carboniferous limestone. 
Though we had not sufficient time at our disposal to follow the whole course of 
the river Oka, we have examined the fossils collected from various localities upon 
its banks by Colonel Olivieri of the Imperial School of Mines, which lie between 
Jelatma and Kolomna, and also from some places on the Moskwa, and we have no 
hesitation in saying, that they all indicate precisely the same group 2 . 
1 The same name is often repeated in Russia as elsewhere. This river Unja, on which the iron-works 
are placed, and where carboniferous limestone appears, is in the government of Vladimir, and very distant 
from the stream of the same name before mentioned north-north-east of Kostroma. 
8 Among these intermediate localities (and probably many others will be detected), we may cite Za- 
raisk on the Oceter, a tributary of the Oka, forty versts from Kolomna, and where the Jura beds lie on car- 
boniferous limestone ; Petrofskaya, seventy versts east-south-east of Moscow ; Ochrinka, near Bronnitza, 
fifty-fiveversts from Moscow (very beautiful fossils) ; Miatchkova, Bieseda, Kolomniskaya and Koroskaya, 
all in the vicinity of the ancient capital. The last-mentioned localities have long been known through 
the researches of Dr Fischer de Waldheim, and the first of them we examined personally. 
