Yol. 55.] TOESION-STETJCTTJKE OP THE DOLOMITES. 565 



passes through Seisser Alp and Schlern Mountain, and differs 

 greatly from the Austrian Survey-work under E. von Mojsisovics. 

 One chapter is devoted to the question of the origin of Schlern 

 Dolomite; and Rothpletz concludes that it is a normal marine 

 deposit and no coral-growth. Further, he gives sections 

 showing that he had nowhere found (as asserted by the officers 

 of the Austrian Survey) that Raibl strata sometimes rest 

 conformably on Cassian beds. 



In 1895, Dr. Salomon^ published the results of his work on the 

 Marmolata region, immediately south of the Enneberg district 

 which had been part of the present author's field of observation. 

 His results show, for this region, the existence of similar phenomena, 

 and lead him to corresponding conclusions. Thus, he proved that 

 {!) thrust-planes occur with overthrust to the south ; (2) the over- 

 thrust-planes are cut by transverse faults ; (3) the igneous dykes 

 occasionally occur in fault-planes ; and he concluded, upon palaeon- 

 tological and stratigraphical grounds, that the Marmolata Limestone 

 was of Wengen and Cassian age in its lower members, and in its 

 higher members the equivalent of the Schlern Dolomite. But 

 whereas Dr. Salomon found the overthrusting to be towards the 

 fiouth in the Marmolata, I had found it to be towards the north 

 in the Diirrenstein, etc., on the northern edge of the Dolomites, 

 and in almost every direction within the Sella Group. 



In 1895 also. Prof. W. C. Brogger^ published the results of his 

 observations among the igneous rocks of the Fleims-Fassa district, 

 arranging the igneous rocks in that area in the following ascend- 

 ing order : — 



(1) Basic dykes and flows (aiigite-porphyrite, tuffs, etc.), of Middle Triassic 



age. 



(2) More acid rocks (particularly monzonite) associated with, but younger 



than, the foregoing. 



(3) Red granite (at Predazzo) younger than 2, and probably associated with 



quartz-porphyry dykes. 



(4) The youngest eruptions of the district, represented by a series of comple- 



mentary dykes, partly of ultrabasic composition (camptonite, etc.) 

 and partly of intermediate composition (li eb en erite -porphyry, 

 etc.). The last-named rock ' seems to represent quite the youngest 

 eruptions of the whole district.' 



(These conclusions appear to be in full accord with the results 

 obtained by the present author in Enneberg and the Groden Pass ; 

 where the youngest dykes belong to the last-named category, and a 

 definite age can be assigned only to older basic dykes which are 

 associated with the flows and tufts demonstrably of Middle Triassic 

 age.) 



In 1897, Dr. Salomon ^ published a paper on the relations of the 



^ ' Geologische u. palaontologische Studien iiber die Marmolata,' Palseonto- 

 graphica, vol. xlii, pp. 1-210. 



^ ' Die Eruptivgesteine des Kristianiagebietes : II. Die Eruptionsfolge der 

 iriadischen Eruptivgesteine bei Predazzo in Siid-Tyrol,' Kristiania, 1895. 



^ ' Ueber Alter, Lagerungsform u. Entstehungsart d. periadriatischen gra- 

 aiitischkornigen Massen,' Tscherm. Min. u. Petr. Mitth. vol. xvii, pp. 109-283. 



