404 Professor Sedgwick and Mr. Murchison on the 



examined by M. Partsch and one of the authors (during the summer of 1830), 

 on both flanks of the Leitha-hills, where it dips off from a primary axis, and 

 is seen, at its lower extremity, to pass into the calcareous conglomerate 

 (No. 5.). It was also examined at Loretto (where, besides the casts of numerous 

 shells, the beds contain bones of large land animals; such as the Stag, the 

 Mastodon, &c.), Eisenstadt, and Margarethen *; in the low range called See- 

 «»-ebir*i'e, borderin"- on the Neusiedler-See ; and at Briiner and Willersdorf on 

 the skirts of the Alps ; and we are convinced, from its place in the several 

 sections, its structure, and its organic remains, that it is cjuite identical with 

 the coral limestone in the central group of Lower Styria. 



The fresh-water group (No. 3.) is only of partial occurrence in the basin. 

 The best example of it is in the conical hill, called the Eicli Kogel, between 

 Baden and Vienna; where it puts on the form of a hard, vesicular, light- 

 coloured limestone, containing shells of the genera. Helix, Lymnaea, and 

 Planorbis ; and rests on the calcareous conglomerates of the Lcitlia-kalk, 

 and the inferior system of marls and sand. 



Where the fresh-water limestone is wanting, the Leitha-kalk is immediately 

 surmounted by the sand and gravel beds (No. 2.), containing the calcareous 

 concretionary masses and the bones above described. This group is spread 

 over all the low ground about Vienna. It possesses many of the same cha- 

 racters, and appears to be contemporaneous, with the upper group of Lower 

 Styria, which we have shown to be of the same age with the old volcanic 

 eruptions of that region. 



Some portions of the preceding group might be confounded with diluvium, 

 and considered as due to the last tumultuous operation of the retiring waters 

 of a deluge. But independently of other phenomena (exhibited in certain parts 

 of the group), such a supposition seems to be entirely invalidated by the exist- 

 ence of a still higher group (No. 1.) ; which is not only of great extent and 

 thickness, but contains delicate shells of living species (such as Helix hispida, 

 Succinea amphibia, &c.), mingled with the bones, and sometimes with nearly 



Naiica tigrinu ; Trochus patuliis, var. (Bast.) ; Cerithium picium (Bast.); a Cone, resembling 

 Coiius deperditus (Brug.); — all of which are Bordeaux fossils: and to these we may add, 

 Naticu hcmiclausa (Min. Con.), and Turritclla incrassuta (Min. Con.) — both of which occui- 

 in the crag. 



4. Some of these fossils are identical with shells found in the upper group of the Styrian basin. 

 For example : Turritella iiicrassata (Min. Con.) ; Cerithium vulgatum ; and C. pictum (Bast.) 

 all of which occur at Radkersberg and Hartberg, and the last also at Poppendorf. 



* A magnificent section of this group (No. 4.) is exposed in the quarries of Margarethen, 

 where 70 or 80 feet of the thick-bedded massive limestone are laid bare, with scarcely a trace of 

 any zsay-board of division. 



