Miss M. M. Ogikie—The U. Trias of St. Cassian. 147 



Below come the equivalents of the Muschelkalk, which lay outside 

 the sphere of my researches. 



There is no great difficulty is establishing this detailed sequence, 

 as the beds between the Buchenstein strata and the Dachstein are 

 exposed in good sections ; each zone is individualized by its own 

 lithological features and the characteristic fossils were collected on 

 the ground. There is a replacement of older by newer forms in 

 passing upwards ; but no recurrence. The two great calcareous 

 dolomitic sei'ies — the Schlern-Dachstein above and the Muschelkalk 

 below — are separated over a large district by the entire non-dolomitic 

 series, and even the well-known Cipit limestones prove themselves 

 to be constant Coralline zones in the Cassian period. 



In determining the limit of Wengen and Cassian strata, I wished 

 to emphasize the first appearance in Triassic time of the varied and 

 highly characteristic fauna of St. Cassian. In this respect ray 

 mapping differs in many places from that of Mojsisovics, e.g. in the 

 typical St. Cassian district the Cassian strata are limited in the map 

 of Mojsisovics to the Prelongei heights, and correspond generally to 

 the " Upper Cassianer Strata " in the succession given above. At 

 the same time Mojsisovics mentions in his text that the Cassian 

 fossils are found on both the Stuores and Buchenstein slopes of the 

 Prelongei ridge. These slopes, from which the main part of the 

 Cassian fossils are derived, I have mapped as Middle and Lower 

 Cassian strata. Again, on the Seisser Alpe, Mojsisovics maps no 

 Cassian strata, preferring to regard the fossils in Cipit Alpe, etc., 

 as being of Wengen age, although remarking that they resemble 

 the later Cassian fossils. In other places, his so-called " Eifi"-Kalk," 

 or " Cipit-Kalk," is said to thin out in Wengen strata or in Cassian 

 strata. The "Riff-Kalk" contains Cassian fossils, and is of Cassian 

 age. 



By means of the above subdivisions, and certain zones in these, 

 I have also found it possible to show that the district is cut up by 

 many dislocations which could not previously have been traced 

 through the Wengen and Cassian strata ; but this part of my work 

 is not yet finished. Another fact which appears is that the EaibI 

 strata lie always above the Schlern Dolomite, and that they are 

 different in character, and stratigraphically separated from, the 

 Cassian strata, which invariably lie below the Schlern Dolomite. 

 This has a distinct bearing on the much-discussed question of 

 the " Cardita strata " in the North Alps. In the carefully-worked 

 sections of N. or Bavarian Alps the " Upper Cardita " Beds are 

 proved to be Eaibler strata resting upon " Wetterstein Kalk," while 

 the Partnach strata, which afford Cassian, Wengen and Buchenstein 

 fossils, underlie the Wetterstein Kalk. 



