JURASSIC STRATA AROUND MOSCOW. 
235 
Jurassic strata around Moscow . — The sections of Jurassic beds in the immediate 
neighbourhood of Moscow exhibit similar relations to the next inferior strata with 
those which prevail near Jelatma and other places on the Oka and at Zaraisk upon 
the Oceter, viz. they are at once incumbent upon one or other member of the car- 
boniferous limestone, a fact we have already alluded to in describing the deposit 
at Inkino. And here we cannot but rejoice, that our visits to Moscow seemed to 
impart new energies to our excellent friend the veteran naturalist Dr. Fischer de 
Waldheim, ex-President of the Society of Natural History of Moscow, who has 
subsequently described some new species, of which we shall speak in the analysis of 
the organic remains We must also in this place specially acknowledge that we 
owe our acquaintance with many of the details of the Jurassic strata near Moscow, 
as well as the best fossils we possess, to Mr. Frears, an intelligent English gentle- 
man resident at that city. 
At Miatchkova, where the great quarries in the white carboniferous limestone 
have laid bare their relations, black shales, differing slightly if at all in lithological 
composition from those upon the Volga and the Oka, form the cover of the mag- 
nesian beds of the older limestone, as represented in this woodcut, which though 
36. 
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e. Detritus and drift, with northern blocks. 
d. Siliceous grits and ferruginous sands with Pierophyllum Murchisonimmm (GBppert), and other plant. . 
i, r. Lower shale (6) with Ammonites, Bclemnites. Sands and shale (o) with Jurassic fossils. 
a. White and yellow magnesian carboniferous limestone with Spirifer Mosquenm. 
previously given, we now repeat, not only to convey a general idea of the manner 
in which the overlying beds succeed to the palaeozoic rocks 3 , but also to define t e 
members of this Jurassic group. 
At a spot within the city of Moscow, and on the right bank of the Mos wa, 
these Jura beds were discovered by Mr. Frears to be incumbent on certain peculiar 
red and sandy beds with limestone, which we have shown to form an integral part 
. Bun. de la Societd des Nat. de Moscou, tom. xv. P . 118, at tom. xvi. Revue des Fossiles du Gou- 
Trthe^qu^ies of Miatchkova the incoherent hlack shale has frequently subsided or has been 
washed down, after the melting of the snow, into the hollows or excavations, and thus in many instances 
the shale beseem, at first sight, to underlie the carboniferous limestone. In the description of the above 
woodcut at page 80, the word tertiary has been erroneously applied to the overlying siliceous grits. 
