GREWINGK NORTHERN PERSIA. 27 



Goniatites I have yet found are confined to my Stage F, and to a 

 few localities. 



The state of preservation of these fossil remains often leaves much 

 to be desired, since they lie in a more or less argillaceous limestone 

 where the shell has disappeared. Their ornamentation, therefore, is 

 not easily recognized, and exhibits in well-preserved fragments much 

 uniformity. The dorsal position of the siphuncle leaves no doubt as 

 to the generic relations of these cephalopods, which from the form of 

 their septa might readily be confounded with the NautilidcB. One 

 species, which I term G. Bohemicus, has a diameter of 25 centi- 

 metres. ^rp^ ^ j_^ 



On some Metals occurring in the Auriferous Sand of Tran- 

 sylvania. By K. Zerrenner. 

 [Sitz. Bericht. d. math. nat. Kl. d. Wiener Akad. vol. xi. pp. 462-464. Leonhard 

 u. Bronu's N. Jahrb, 1854, p. 68.] 



In the washing of at least 15,000 cwts. of the auriferous sand of 

 Olahpian in the Siebenbiirgen there were found only three very small 

 grains of platinum — a flattened morsel of native copper (observed else- 

 where only in the gold-washings at Goroblagodatski in the Ural), 

 — native lead in rather larger quantity, occurring sometimes as small 

 scales and grains in the gold-sand of the Tiskur range, and since 

 1839 it has been occasionally met with in the Bogolowsk district of 

 the Ural, in the Leontjewskoi mine, and in the auriferous sand of 

 Velika, near Pozega, in Southern Slavonia, in somewhat larger 

 grains,^ Loth [-gL ounce] in weight; — cyanite and felspar-porphyry 

 occur as ingredients in the Olahpian gold-sand. [T. R. J.J 



The Geology of Northern Persia. By Dr. C. Grewingk. 



8vo, pp. 148. With Woodcuts and Geological Map. St. Peters- 

 burgh. 1853. Die geognostischen und orographischen Verbal t- 

 nisse des nordlichen Persiens. 

 This work is the result of M. Grewingk's examination of the geo- 

 logical specimens collected by Dr. F. Buhse, in his travels in 1847-49, 

 and forwarded by him to the author, and of the collection made by 

 M. Woskoboinikow, together with the examination and collation of 

 the accounts of these and other earlier travellers. This first attempt 

 of a general view of the geological conditions of Northern Persia is 

 illustrated by a coloured hthograph map, sketched by the author 

 according to the latest geographical information. 



The geographical description of the district occupies pp. 2-30 ; 

 the geological notices of the several localities, with full references to 

 numerous authorities, occupy pp. 31-119 ; and the general view of 

 the geology of the whole region is given in pp. 120-148. 

 The formations recognized by the author are — 

 Granite and quartziferous porphyry. 

 Diorite, serpentine, diorite-porphyry, porphyritic breccia. 

 Diabasic porphyry, melaphyre, and breccias ; amygdaloid, dolerite, 



and basalt. 

 Andesite, porphyritic trachyte, pearlstone, tuflFa, and breccias. 



