14 GEOLOGICAL MEMOIRS. 



The group A may be parallelized, with D'Orbigny's " Senonien ; " 

 the group B with his " Turonien;" aud the group C with the Upper 

 Neocomian. 



V. Trias. — This is wanting in Istria, hut is conspicuously deve- 

 loped in Inner-Carniola, bordered by the Cretaceous group in a 

 direction nearly parallel to the line of fracture running through the 

 Planina, Zirknitz, and Baha Valleys. It may be divided into three 

 subgroups : — 



A. The Upper Trias, with prevailing greyish limestones and sili- 

 ceous and sometimes striped dolomites, with traces of repeated 

 disturbances. Its fossil remains are Chemnitzice and (especially in 

 the intercalated reddish marl-strata) numerous individuals of Mega- 

 lodus CarintMacus, Corbula Rosthorni, and other forms charac- 

 terizing the " Baibl-beds." The limestones, nearly everywhere 

 associated with the Megalodus-strata, are full of the shells of a large 

 bivalve (Ostrea), so solidly impasted in the limestone that specimens 

 sufficient for generic determination are scarcely to be obtained. 



B. The Middle Trias, consisting in descending order of — 1. Black 

 limestones, full of Pentacrinites, with some few small Brachiopods. 



2. Fine-oolitic limestones, with numerous small Gasteropods and 

 Bivalves, characterizing them as analogous to the St. Cassian strata. 



3. A series of dolomitic strata, of considerable thickness. 



C. The Lower Trias, exhibiting in descending order — -1. Dolo- 

 mite, in thin strata, alternating with corneous silex and variegated 

 marls. 2. Yariegated marl-slates and red sandstones, with thin 

 strata of dolomite, yellowish and grey sandstones and slates, bearing 

 the palaeontological features of the Werfen-strata. 



VI. Carboniferous Group. — (Gailthal-beds : conglomerates, slates, 

 and sandstones) ; confined to some few localities, and nowhere ex- 

 tensive. [Count M.] 



On the Tertiaeies and Porphyries of the Sank Kivee, Lower Sitria. 

 By M. Th. Zollikofee. 



[Proceed. Imp. Geol. Instit. Vienna, January 25, 1859.] 



These Tertiaries, deposited in the depressions of rocks of more 

 ancient date, are remarkable as including a great quantity of Brown- 

 coal, and as being intermediate in age between the Eocene and JSTeogene 

 periods. Besides the impressions of leaves bearing an Eocene 

 character, as those of P^tzka, no fossil species occurring in them is 

 decidedly Eocene or Miocene, some of them (as CeritMum margari- 

 taceum) being rather indicative of an Oligocene origin. 



In connexion with these Tertiaries, solid porphyries and porphy- 

 ritic tuffs make their appearance, which, although known long ago, 

 have been the subject of many controversies. M. de Morlot sup- 

 poses them to be partial 'metamoi-phoses of the sedimentary rocks 

 with which they are sometimes alternate. Dr. Bolle admits the 

 eruption of solid porphyry, subsequently destroyed and regenerated 

 into tufaceous layers. According to M. Zollikofer's local observa- 



