

470 HISTORY OF GEOLOGY AND PALEONTOLOGY. 



Cassian, and Blelberg strata, and a part of the carbonaceous 

 deposits in the Vienna sandstone (Lunz strata). Hauer at 

 that time regarded the Hallstatt limestone as younger than the 

 Dachstein limestone. 



The organised efforts of the Austrian Geological Survey 

 rapidly extended the knowledge of Alpine geology. In 1853, 

 the Survey Reports sub-divided the Triassic formation of 

 North Tyrol into two groups: i, the Werfen strata andGutten- 

 stein limestones (equivalents of the Bunter sandstone and Lower 

 Muschelkalk respectively); and 2, the Hallstatt strata (or 

 Upper Muschelkalk). The salt deposits were said not to be 

 intercalations in Alpine limestone, as Lill von Lilienbach had 

 assumed, but, according to Stur and Suess, belonged to the 

 Werfen strata. The Hallstatt strata were now said to repose 

 on the Guttenstein strata and to be succeeded by Dachstein 

 limestone^ and on the evidence of Lipold the Dachstein lime- 

 stone was united with the Kossen (Gervillia) strata and referred 

 to Liassic age. 



There still seemed no means of determining the strati- 

 graphical position of the dolomitic rock in the north Alps. 

 Hauer, in his report, mainly relied upon two valuable works, 

 the first a memoir by Emmrich (1853) on the eastern part- 

 of the Bavarian Alps, and the other by Escher von der 

 Linth (1853) on the geology of Vorarlberg. 



With considerable insight, Emmrich had distinguished in 

 the Bavarian Alps a series of well-marked life zones in the 

 Mesozoic rocks: 



Cenomanian 9. Orbitulina sandstone (cf. p. 244). 



Neocomian - 8. Aptychus shales (cf. p. 405). 

 Jurassic - - 7. Haselberg marble passing into the 



Tithonian group. 

 Liassic - - 6. Amaltheus marls with Amm. Amal- 



theus, etc. 

 '5. Gervillia beds or Kossen strata with 



Avicula contorta, etc. 



Saliferous 



System and 



St. Cassian 



Series. 



Oolitic limestones with K&ninckina 

 Leonhardi and other St. Cassian 

 types. 



Lithodendron limestone (cf. p. 250). 

 Muschelkalk - 3. Middle Alpine limestone with 

 Halobia Stun, etc. 



