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The Hon. Mr. Strangways on the 
affording excellent specimens, among the diluvian gravel on the 
summit of the hills bounding the north side of the vale of the 
Ishora, especially in gravel pits near Repolova, and Anteleva. 
The two beds immediately above this consist also of a sandstone 
containing chamites : they are, in fact, a continuation of the last, 
but differ in some respects from it. The lowest is usually of a 
reddish or even rosy colour, and contains vast quantities of chamites, 
or rather fragments of them, strewed throughout its mass, in the 
direction of the planes of stratification. The upper bed is of a 
dark green or blackish brown colour, equally filled with chamites, 
some of which have a tendency to iridescence or metallic lustre. 
This circumstance, together with the regular laminae in which they 
are disposed, gives them a certain resemblance to mica slate or 
gneiss, for which the rolled fragments, in which state this rock was 
first noticed, were taken. Its extreme hardness, even when in situ , 
the obscurity of the organic structure of the shells it contains, and 
its being found in company with rolled gravel entirely composed 
of masses of primitive rocks, some of which consist of real gneiss 
nearly resembling it in outward appearance, may account for this 
error. It is present on the Ishora in situ , but may be seen best 
where I first discovered it, at its outcrop in a quarry at the north 
end of the village of Slavenca, west of the river of that name, and 
south of Pavloosk. 
Above these chamite beds the sandstone assumes a ferruginous 
aspect ; its colour yellow, red, black or brown. It is seen in this 
state in the outlying ridge behind Peterhof and Oranienbaum ; also 
throughout the neighbourhood of Pavloosk ; and in a loose state, 
forms the hills situated to the north of Petersburg and the Neva. 
Connected with this bed, is a mammillated or botryoidal sandstone, 
which occurs in situ in this part of the country, from the Popovca 
