500 Intelligence and Miscellaneous Articles. 



"5 



nian or Old Red, Carboniferous, Newer Red, and Oolitic Systems ; 

 but it is copiously enlarged, by showing the extension of the car- 

 boniferous system over a very wide area, ranging from near Witepsk, 

 by the south of Tula and Kaluga, to the S.E. of Cazan. A vast 

 spread of chalk and tertiary deposits directly overlies these carbo- 

 niferous limestones, which rise again from beneath these younger 

 formations in the great carbonaceous tract of the Donetz, the 

 southern edge of which consists of the granitic steppe. A sec- 

 tion made by Count Keyserling and Professor Blasius to the south 

 of Kaluga, indicates a succession from what these naturalists be- 

 lieve to be the lower beds of the carboniferous limestone, contain- 

 ing Spirifer Mosquensis, into superior strata of sand and shale 

 with coal, subordinate to bands of limestone containing the Pro- 

 ductus hemisphericus, the coal being associated with much red earth, 

 and overlaid by the upper carboniferous limestone. They also 

 express their belief that the millstone grits which have been alluded 

 to near Moscow must be considered of tertiary age, as similar beds 

 overlie true chalk. 



Mr. Murchison takes this opportunity, in the name of his friend 

 M. de Verneuil and himself, of recording his sense of the value of 

 the additional data which are due to the labours of Baron de Mey- 

 endorf and his associates, and trusts that after an exploration of the 

 flanks of the Ural, and other tracts near Orenburg and in the South, 

 all the chief facts will have been obtained for the construction of a 

 general geological map of Russia in Europe. 



Count Keyserling, who has traced the shales with Ammonites 

 near Ust-Sisolsk (N. Lat. 61°, E. Long. 51°*), has indeed contri- 

 buted most powerfully to these results, both by his patient obser- 

 vation, sound knowledge of natural history, and by his barometrical 

 admeasurement of heights, — a point of great geological importance 

 in those central parts of the country where the strata are not de- 

 ranged. By one of his observations, it appears, that the younger 

 pleiocene deposits on the Dwina, which he detected in company 

 with M. de Verneuil and Mr. Murchison, are about 150 feet above 

 the White Sea. Count Keyserling, now at St. Peterburgh, will 

 accompany the authors in their journey to the Ural Mountains this 

 summer. — March 26. 



LXXIV. Intelligence and Miscellaneous Articles. 



MR. BRAYLF.Y'S LECTURES ON IGNEOUS METEORS AND 

 METEORITES. 



THE following is the Syllabus of a Course of Lectures on Igneous 

 Meteors and Meteorites which I am about to deliver at the London 

 Institution, as announced in our last Number, p. 414, as it has been 



* Similar Jurassic beds had been previously observed by M. Strajeske 

 in the N. Ural, Lat. 64° north, and their fossils are described by M. Leopold 

 de Buch in his recent work, ' Beitrage zur bestimmung der Gcbirgs-forma- 

 tioncn in Russ-land.' 



