STRATIGRAPHICAL GEOLOGY. 469 



In the year 1846, Hauer's first monograph of the Cephalo- 

 pods in the Hallstatt limestone appeared, and also a treatise 

 by the same eminent author on the Molluscan marble of 

 Bleiberg in Carinthia. Hauer demonstrated the identity of 

 some of the species in these calcareous rocks with St. Cassian 

 species, and thereby founded the knowledge of the younger 

 horizons of Trias in the northern Alps. Further contributions 

 by Hauer in 1847 and 1849 corroborated the great abundance 

 of the Cephalopod fauna in the limestone rock in the neigh- 

 bourhood of Hallstatt and Aussee, and showed that it was 

 no less varied in its character than that of St. Cassian. The 

 characteristic gastropods from the Hallstatt limestone were 

 described by Hoernes. 



Although Hauer's comparison of the fauna of the Hallstatt 

 marble with that of the St. Cassian marls had given an indica- 

 tion of the age of this particular Alpine limestone, and had 

 shown it to be unquestionably distinct from the Liassic lime- 

 stone of Adneth, Morlot (1847) st ^ regarded the Alpine lime- 

 stone, in accordance with the earlier work of Murchison and 

 Buckland, as Liassic or Jurassic. In a work otherwise very 

 admirable in many ways, The Explanatory Text of a Geological 

 Sketch-Map of North-Eastern Tyrol, Morlot entirely ignored 

 all sub-divisions of the " Alpine Limestone " that had been 

 previously attempted. The Geognostic Map of Tyrol, published 

 in 1849 by the Mountaineering Club of Tyrol and Yararlberg, 

 merely differentiated lower, middle, and upper Alpine lime- 

 stone, without assigning a definite age to any of the groups. 



A general review of the literature and the position of 

 geological research was written by Hauer in the year 

 1850, after the Imperial Geological Survey Department had 

 been established in Austria. According to Hauer, the 

 Alpine equivalents of the Bunter sandstones are the Werfen 

 strata, the Sernft shales and conglomerates of the northern 

 Alps, the Seis strata in South Tyrol, and the red sandstones 

 and conglomerates in Carinthia and Carniola. A considerable 

 part of the Alpine limestone belongs to the Trias; to the 

 Lower Muschelkalk may be referred the so-called Isocardia 

 limestone with " Dachstein bivalves " in the Salzkammergut, 

 in Bavaria and Vorarlberg, and the Dolomite with Cardium 

 triquetrum in the southern Alps. To the Upper Muschel- 

 kalk (or Keuper?) belong the marbled limestones of the Salz- 

 kammergut with Ammonites and Monotis, the Wengen, St. 



