484 HISTORY OF GEOLOGY AND PALEONTOLOGY. 



years. His first geological tours were taken in the Salzkam- 

 mergut in the companionship of his teacher, Suess, and at the 

 close of the summer the two authors published a short com- 

 munication in the Survey Reports on the Triassic succession 

 between the lakes of Hallstatt and Wolfgang. Especial atten- 

 tion was given to the development of Rhsetic and Jurassic 

 formations in the Osterhorn mountains, near Lake Wolfgang. 

 In connection with two sections in Konigsbach and Kendel- 

 graben, carried out with the most scrupulous accuracy, Suess 

 demonstrated the fact that different lithological and palaeonto- 

 logical developments predominated in the Rhaetic group of 

 adjacent localities, and gave the distinctive names of Swabian, 

 Carpathian, Kossen, and Salzburg facies to the particular 

 Rhaetic series characteristic of the localities. 



During the two following years Mojsisovics was engaged 

 on the special investigation of the Alpine salt deposits. 

 The results of his personal researches were set forth in a 

 memoir entitled " On the sub-division of the Upper Trias 

 formations in the Eastern Alps" (Jahrb. k. k. geol. Reichsanst., 

 1869). This memoir attracted great notice at the time on 

 account of many new views expressed in it. 



In opposition to Giimbel, Mojsisovics thought it undesirable 

 in those earlier days of Alpine research to compare Alpine and 

 extra- Alpine areas, and to make this comparison a basis of the 

 names that were to be applied to the Alpine rocks. He also 

 advanced the opinion that the pelagic sediments of the Alpine 

 Upper Trias included several distinguishable Cephalopod 

 faunas, the lowest of which, with Trachyceras dolerilicus and 

 T. Archelaus, characterised the Partnach marls and shales and 

 the siliceous and nodular beds with Halobia Lommeli, present 

 both in Northern and Southern Alps. The second Cephalopod 

 fauna, with Ammonites Metternichi^ Am. tornatus, and numer- 

 ous species of Arcestes^ seemed to be limited to the Zlambach 

 and the Hallstatt strata of the Salzkammergut. The next 

 Cephalopod fauna included Trachyceras Aonoides and many 

 other richly-decorated Ammonite species. Mojsisovics thought 

 the most important palaeontological line of division in the 

 Alpine Upper Trias was that which separated the zone of 

 Ammonites Metternichi and the zone of Ammonites Aonoides. 

 He sub-divided the Alpine Upper Trias on the basis of these 

 distinctive faunas into a Noric and a Karnic division, suc- 

 ceeded by the Rhaetic group. 



