VON HAUER HIERLATZ AMMONITES. 39 



subdivided into distinct transverse valleys, whose union into one 

 principal valley has taken place subsequently to the deposition of the 

 gravels and sands. They prove also that the water-courses of the 

 Drave and the Mur were not completely separated at this epoch 

 (which is probably coincident with the limit between the tertiary 

 and the diluvial periods), as rock-fragments derived from the district 

 now drained by the Mur are found in the lateral valleys now opening 

 into the valley of the Urave. 



This alternation of areas of hard rock surface and areas of gravel, 

 sand, and clay, the latter offering a great variety of circumscribed 

 cultivatible surfaces, have impressed peculiar characters on the mode 

 of agriculture used in the region described. These deposits are a 

 necessary condition for the existence of the large number of hamlets 

 in several parts of the Alps ; nor could the extreme limit of culture 

 have reached without their aid the height of 4700 feet (=z4S73'9 

 English feet) above the sea-level. [Count M.] 



On the Composition of the Vienna Sandstone. 

 By C. von IIauer. 



[Proceedings of the Imp. Geol. Institute of Vienna, Nov. 7, 1854.] 



From the chemical researches made by Chev. Charles von Hauer on 

 the matrix by which the quartz granules are cemented together in 

 the "Vienna sandstone," it appears that this cement is identical 

 with that of the " Carpathian sandstone," recently examined by 

 Prof. Zeuschner, and long ago by the late Prof. Hacquet. It is a 

 mixture of the carbonates of lime and magnesia, and of oxydulated 

 iron, varying in quantity from 2 to 80 per cent, of the whole mass in 

 different localities, but keeping very constant proportions in each 

 separate stratum. The relative proportion of the carbonates of lime 

 and magnesia varies from 0*7 : 1 to 42 : 1 ; but remains constant in 

 each separate locality. Lime is generally predominant, but the 

 magnesia and oxydule of iron are never absent. [Count M.] 



On some asymmetrical Ammonites from Hierlatz. 

 By M. Fr. von Hauer. 



[Proceedings of the Imp. Geol. Institute of Vienna, Nov. 14, 1854.] 



In this communication M. Fr. von Hauer described three asymme- 

 trical species of Ammonites from the Hierlatz strata. 



Two of these, Am. Suessii and Am. abnormis, have the shell of a 

 normal shape, but the outlines of the lobes are disposed asymme- 

 trically ; the dorsal lobe, instead of being separated into two equal 

 halves by the medio-dorsal line, has suffered a considerable change 

 of place in a lateral direction. The lobe-outlines of the third species. 

 Am. Janus, belonging to the Amaltheus group, are symmetrical, but 

 the right side of the shell is developed quite differently from the 

 left side. Am. Suessii has been previously described by Prof. 

 Schafhautl of Munich, who overlooked the lateral position of the 

 siphuncle, and placed it in the genus Nautilus. [Count M.] 



