6 GEOIOGICAL MEMOIES. 



covered with pine-forests. The surface of the sandstone is charac- 

 terized by extensive slightly convex meadows, with short grass and 

 uniform vegetation. The limit between the Triassic limestones and 

 these sandstones supplies the sources of most of the waters running 

 through this wilderness. Porests on the sandstones and conglome- 

 rates are subject to devastation by storms, easily uprooting the trees, 

 which get only an insecure hold in such soils. 



Mica-schist and gneiss prevail in the three lateral ranges ; this 

 last in the centre is overlain by a broader west and narrower east 

 zone of mica-schist. A gigantic vein of granulite, remarkably analo- 

 gous to that of the Iser-Gebirg (Bohemia), runs through the central 

 gneissic mass in a K. and S. direction. The limit between the crys- 

 talline and Eocene rocks is marked by a zone of argillaceous and 

 amphibolic slates, including brown-iron- ores, containing 50 to 55 per 

 cent, of iron. Large and numerous granite-veins and extensive 

 masses of very pure quartz (perhaps fit for glass -manufacturing in 

 this country so very abundant in wood) occur also in this limitary 

 zone. [Count M.] 



On the AMMOiaTES of Yal Trompia. By Fe. von Hatjer. 



[Proceed. Imp. Acad. Vienna, October 31, 1861.] 



These Ammonites are found in the Hmestones of Monte Domaro and 

 Guglialmo, known under the local denomination of " Medolo." This 

 limestone is of a grey or yellowish colour, strongly impregnated with 

 corneous silex, and is not very thick-bedded. The Ammonites occur- 

 ring in it are changed into iron-pyrites or hydroxidated iron. Among 

 a collection of these fossils, formed by M. SpineUi's persevering 

 exertions, seven species may be distinguished, of which four are as 

 yet undescribed. The remaining three species are known to occur 

 in the Middle and Lower Lias. The " Medolo " may be considered 

 as a geological parallel to the red ammonite-limestone of Western 

 Lombardy ; and both of these Liassic deposits are perfectly distinct 

 from the Jurassic strata, and from the Lower Cretaceous deposits 

 known under the provincial denomination of " Majohca." 



[Count M.], 



On the Ceetaceous Deposits of South-west HuNaABX. 



[Proceed. Imp, Acad. Yienna, November 14, 1861.] 

 In the Bakony Forest, these deposits, first noticed by MM. Kovats 

 and Roemer, and explored in the summer of 1861 by MM. Stache 

 and Paul over a rather considerable area, may petrographically and 

 palseontologicaUy be brought under six distinct subdivisions, some 

 of them strikingly different in character from the Alpine and Car- 

 pathian Cretaceous strata. The nineteen species of Cephalopods 

 occurring in them belong to the genera Belemnites, Turrilites, Hamites, 

 8caphites, and Ammonites ; among these four are undescribed. The 

 rest, for the most part not yet found in the Austrian Empire, are 



