£0 Dr Bout's Observations on the 



limestone so classified terminates in the Voralberg, and from 

 thence to Tatra we observed nothing like it. Further, we find 

 only predominating varieties of light coloured alpine limestone, 

 which also exist in the Western Alps, or the magnesian lime- 

 stones and the dolomites. Here and there at Werfen, between 

 Abtenau and Radstadt, the undermost alpine limestone hides 

 some small masses of dark coloured limestone, or of greyish 

 magnesian limestone, which also exist as subordinate beds in the 

 arenaceous red-coloured system ; but it is by no means certain 

 that these masses represent the lias. 



On the other hand, we, as has been done by our authors, com- 

 pared the whole alpine limestone with the oolite series, and even 

 with the uppermost members of the series, and its saliferous sub- 

 ordinate masses appeared to be nothing more than accidents of the 

 Jurassic subdivisions, not far from the Oxford and Kimmeridge 

 clay. Their descriptions of the salt of Hall, Hallein, and Ischel 

 are correct, and correspond with what has been very often pub- 

 lished by others. Nevertheless, the peculiar cellular rauchwadce- 

 like limestone near the salt of Hall escaped their notice ; and the 

 valley of Lavatsch behind these masses would have fully repaid, 

 by its fossils, the trouble of a visit. At Hallein they appear 

 not to have sufiiciently distinguished the two or three great 

 bodies of rock, where sandstone or limestone alternately predo- 

 minate, and they have neglected to give the exact place of the 

 orthoceratite limestone. 



We observe with pleasure, in their article on the newer alpine 

 timestone, that they place the saliferous arenaceous fucoidal de- 

 posite of Hallein under that kind of limestone which forms the 

 Untersberg ; this position, and the transition of these two rocks 

 into each other, is the discovery of our excellent friend Mr Lill 

 von Lilienbach. This same formation underlies, according to 

 our authors, thehippurite limestone, covered by gypseous marls, 

 nummulite rocks, sandstones and marls, with Gossau fossils. It 

 is already known that they make the Gossau marls tertiary, and 

 that the Untersberg would offer an isolated, or, if they choose, 

 a second example of the transition from the chalk formation to 

 the tertiary. This is the great point of controversy, which we 

 shall consider in a subsequent part of this communication. On 

 the other hand, they misplace the coal mines of the Alps of 



