24 GEOLOGICAL MEMOIRS. 



extent of this lake may have been still greater from east to west, as 

 indicated by the occurrence of Inzersdorf fossils in the Hungarian 

 basin, of which (as the late P. Partsch first proved) the Vienna 

 basin was only a bay. Most probably the waters of both basins 

 were still connected while the deposition of the Inzersdorf strata was 

 going on ; at least, these are well developed and very fossiliferous at 

 certain places within the strait between the Leitha and the Rosalia 

 mountain-regions, — that is, in the triangular space between Neu- 

 stadt, Eisenstadt, and Oedenburg. 



Turning from Oedenburg southward to the plain along the margin 

 of the mountain-range, the strata in question are again met with 

 near Schlaning and Rothen-Thurm, S.W of Giins (W. Hungary), 

 where M. Romer* has noted the occurrence of Congerice. They dis- 

 appear, however, within the Styrian bay ; at least MM. Andrae and 

 Rolle, who have lately most carefully investigated these regions as 

 the Geologists of the Styrian Geologico-mining Society, could nowhere 

 find the organic remains peculiar to the Congerian beds. 



M. Andrae, describing the portion of this bay west of the parallel 

 of Gratz f. mentions the occurrence of sandstones, shales, and clays, 

 partially charged with seams of brown-coal and impressions of leaves 

 (and, on this account, probably of freshwater origin), but containing 

 no fossils characteristic of our Congerian strata. He mentions like- 

 wise, as occurring about Grafendorf, Gleisdorf, and E. of Hartberg, 

 limestones with a Cerithian fauna, analogous to the fauna of the 

 strata immediately beneath the Inzersdorf Clays within the Vienna 

 basin ; but he gives no indication of any connexion between these 

 limestones (erroneously called by him " Leitha-limestones") and the 

 strata with brown-coal. 



The small freshwater basin of Rein, N.W. of Gratz, has been in- 

 vestigated by Prof. Ungerl and M. Morlot§, and lately by MM. 

 Peters and Gobanz || . Of 20 Gasteropods (chiefly of the genera Helix, 

 Planorbis, Limncms, &c.) determined by M. Gobanz, 16 likewise 

 occur in the freshwater deposits of JST.W. Bohemia and in the fresh- 

 water limestones of Wirtemberg. None of the characteristic species 

 of our " Inzersdorf Tegel" are among them ; only the Planorbis 

 pseudo-ammonicus, Voltz, far spread through all freshwater lime- 

 stones, is common to both these deposits, although of extremely rare 

 occurrence in the " Inzersdorf Tegel." 



South of Gratz, Dr. Rolle"f[ has found a not quite continuous bar of 

 ancient rocks (the Plawutsch and Sausal ranges) dividing the Ter- 

 tiary bay of Gratz into two sections, having very different fades. 

 The lignitiferous deposits of the Koflach and Voitsberg bay, and the 

 freshwater deposits with glance-coal of Eibiswald, Steiereg, Wies, 



* Verhandl. Vereins Naturk. Presburg, iii. 2nd abstract of Meetings, p. 10. 

 + Jahrbucb K. K. geolog. Reichsanstalt, v. p. 529. 

 \ " Gratz, ein naturhistorisches, &c. Gemalde diesers Stadt," p. 79. 

 § " Erliiuterungen zur 8. Section d. General-Quartiermeisterstabs-Specia]- 

 karte v. Steiermark u. Illyrien," p. 35. 



|| Sitzungsbericht. Akad. Wissensch. xiii. p. 180. 

 *![ Jahrbueh geol. Reichsanst. vii. p. 535. 



