PETERS BUDA. FCETTERLE AND WOLF TYROL. 33 



On the Geology o/Buda a7id its Environs. By Prof. Peters. 



[Proceed. Imp. Geol. Instit. Vienna, May 1857.] 



Prof. Peters' observations especially refer to the banks of the 

 Danube between Hanzelbek and St. Eudree. The oldest rock of this 

 district is a white, compact, frequently dolomitic, and occasionally 

 red-veined limestone, forming an extensive and hilly area, covered 

 with forests, between Kooacri and the Valley of Buda-Keszyi. As 

 no fossils have yet been found in this limestone, it is difficult to de- 

 termine its geological age, and to distinguish it from the younger 

 eocene limestones and dolomites. The eocene deposit following next 

 is an extensive Nummulitic limestone, frequently dolomitized, of 

 200-250 feet thickness, and comprising nearly the whole of the 

 Buda dolomites, especially the white friable varieties, used for scour- 

 ing-purposes. Next in age comes a yellow and grey, eocene, cal- 

 careous marl, with subordinate beds of sandy and loamy marls, and 

 of Nummulitic limestone ; total thickness, 450 feet. This marl con- 

 stitutes the Fortress Mountain, the north-west portion of the Blocks- 

 berg, the eastern part of the Schwabenberg, and generally most of 

 the hills around Buda. 



The eocene plastic clays (Tegel), highly developed around Gran, 

 are strictly separated from both the above-mentioned series of deposits. 

 A small portion of the clays, compressed by the Nummulitic lime- 

 stone of Mount Calvary, and overlaid by freshwater deposits, extends 

 as far as the environs of Buda. 



The Neogene deposits of Buda may be subdivided thus: — 1. 

 Lower and middle plastic clays (corresponding to the Tegel of Baden, 

 near Vienna). 2. Yellow sands, analogous to those of Vienna Leitha- 

 limestone. 3. Leitha-limestone. 4. (ycrithian limestone, intimately 

 connected with the Leitha-limestone. 5. Sands and sandstones, with 

 remains of Aceratheriimi incisivum. 6. Lignitiferous freshwater 

 deposits. 7. Trachytic tuffs. The older Diluvium seems to be 

 wanting ; the later Diluvium is represented by extensive deposits of 

 Loess and by calcareous tuffs. [Count M.] 



On the Geology of Part of the Tyrol. 

 By MM. Fcetterle and H. Wolf. 



[Proceed. Imp. Geol. Instit. Vienna, June and July 1857.] 



In the southern extremity of the Tyrol, as far down as Roncono, 

 Trente, and Val Sugana, the lowest rocks seen are Verrucano and 

 dark- red sandstone, forming a mountain-mass towards the Chieza, 

 between Lodrone and Cologna, down to the frontier of Lombardy. 

 They are overlaid by Lower Muschelkalk, Dachstein-limestone, and 

 dolomites, without the intercalation of Upper Triassic strata. 

 Dachstein-dolomite, with imbedded Kossen-strata in Val Ampola, 

 extends between Val Bona and the Lake of Garda, and on the foot 

 of the steep rocks along the Sarca and Adige valleys from the Vene- 

 tian Frontier upwards to Trente, where it occupies the lowest place in 



