Structure of the Eastern Alps. 393 



b. Yellowish siliceous limestone, with many casts of shells, amono^ which are 



Ccrithium pictum * (Bast.) ; C. vulgatum ; C. pupceforme f (Bast.) ; and 

 three or four other species: TurritcUa incrassata | (Sow.); Cardium 

 transversum^; C. ot/wmAm/w 1| ; a Sanguinolaria ; a Venericardia ; Num- 

 mulites variolaria^? &c. &c. The lower part of these grits compose 

 beds from one to two feet thick, but the higher portions of them are made 

 up of thin slaty layers. The surfaces of the slabs are concretionary and 

 sometimes oolitic; and some of the masses, v^hen fractured, separate at 

 joints which are stained with black oxide of iron g 



c. Greenish, calcareous, iron-shot sandstone, with Cerithia 3 q 



d. Thin layer of blue marl 2 



e. Hard, micaceous calc-grits, of a greenish colour. Some of them exhibit 



flattened spheroidal concretions, and are quarried for building. They 

 are surmounted by yellowish and greenisli sandstone with casts of shells, 



which finally pass into yellow and blue arenaceous marls 10 



/. Yellow, micaceous sandstone and sandy marl, with many casts of shells. ... 30 



119 2 



Several of the more calcareous beds of this section (especially in the second 

 subdivision marked h.), exhibit a tendency to the oolitic structure. As, how- 

 ever^ the tertiary oolites are more perfectly developed in beds exactly on the 

 same parallel, which are exposed in the transverse section from Regisberg to 

 Radkersberg-, we pass them over without further notice in this place. 



Bones of several species of Mammalia have been found in some of the Rad- 

 kersberg- beds ; and several interesting specimens of them are placed in the 

 museum at Gratz. This fact is important, as it not only assists us in com- 

 paring tiie upper tertiary systems of the basins of Vienna and Styria, but also 

 establishes an analogy between them and the younger deposits of the Sub- 

 Apennine regions. 



We here terminate our description of the section through the successive 

 deposits of the Styrian basin. Though the order of superposition is sufficiently 

 clear, the groups are ill defined ; and one or two of them have been adopted 

 in the preceding details, more for the purpose of facilitating the description 

 of the whole series, than from their possessing any very distinctive characters 

 by which they are separated from the other contiguous groups. For the pur- 

 poses of general comparison, we think (as we have stated in the introduction) 

 that three principal subdivisions of the whole series will be found sufficient. 

 The first comprising all the tertiary strata inferior to the great coralline lime- 

 stone — the second, all the strata associated with the various forms of the coral- 



* Env. de Bordeaux, PI. iii. fig. 6. t ^^'^*^- P'- '''• ^'S' ^^• 



{ Min. Con. Tab. li. § See Plate XXXIX. fig. 2. 



II See Plate XXXIX. fig. 3. 1 Min. Con. Tab. dxxxviii. fig. 3. 



VOL. III. SECOND SERIES. 3 E 



