﻿104 



TROF. E. W. SKEATS ON THE 



[Feb. 1905, 



specimen 80 feet below the summit, the second from a specimen 

 1000 feet above Bchlernbach. The first specimen contained 1*33 

 per cent, of iron-oxide and residue, while *71 of insoluble residue 

 was obtained from the second. 



The Langkofl. 



In this area also the dolomite probably corresponds in age both 

 to the Wengen and to the St. Cassian deposits, since on the north- 

 eastern side of the mountain it is seen to follow conformably the 

 representative of the Buchenstein Beds. 



The first two specimens (Nos. 96 & 95) were blocks fallen from 

 the upper part of the mountain. Nos. 94, 93, & 92 were taken in 

 descending order, in situ from the eastern side of the mountain 

 facing the Sella massif. No. 92 was taken only a foot or so above 

 the junction with the bedded Buchenstein Limestone. 



No. 

 *96 

 *95 

 94 

 93 

 92 



CaC0 3 . 



MgC0 3 . 



Per cent. 



Per cent. 



54-7 



45-3 



54-7 



453 



54-7 



41-3 



68-9 



29-0 



56-1 



439 



Insoluble residue. 

 Per cent. 

 0-02 

 0013 

 4-00 

 213 

 trace 



* Not in place. 



It will be noticed that three of the specimens are practically 

 devoid of insoluble residue. Nos. 94 & 93, containing residue 

 in considerable quantity, are specimens of a reddish dolomite- 

 conglomerate, which lines the almost-vertical eastern face of the 

 mountain. This material, both in its appearance and in its mode 

 of occurrence, closely resembles a reef-talus. It will be seen that 

 two of the specimens have the composition of a true dolomite. 



The Marmolata. 



The four specimens collected were obtained from the northern 

 flank of the mountain, near its base, and during the ascent to the 

 Fedaja Pass. No. 32 was from an immense fallen block, at the 

 lower end of the Fedaja Valley. Nos. 33, 34, & 35 were from rocks 

 higher up the valley, the two last-mentioned specimens being taken 

 from the southern shores of the Fedaja See. The dolomite exhibits 

 a fairly-steep northerly dip, and has at its base Buchenstein Beds. 

 Hence, the lower parts of the mass from which the specimens were 

 collected are probably of Wengen age. Augite-porphyry lava of 

 that age abuts against the northern slopes of the massif, and 

 No. 35, containing 0*6 per cent, of insoluble residue, was taken 

 from near the junction with the volcanic rock. 



No. 

 35 

 34 

 33 

 *32 



1 CaC0 3 . 



MgC0 3 . 



Per cent. 



Per cent. 



973 



21 



970 



3-0 



95-8 



4-2 



86-7 



13-0 



Insoluble residue. 

 Per cent. 

 •6 



•26 



* Not in place. 



