Miss M. M. Ogilvie— Coral in ihe "Dolomites." 9 



some parts of the Latemar and the mountains still further west to 

 a lagoon formation ; but he describes a large, originally continuous, 

 dolomite mass, " with the Schlern for the most northerly, and the 

 Piz, near Sagron, for the most southerly point," as an immense 

 Eeef. The Marmolata Mountain and the Mount Alto de Pelsa " are 

 two important continuations of this mass, jutting out in peninsular 

 fashion into the eastern district" {vide "Horizontal Extension of the 

 Dolomite Reefs in Lower Wengen Time," Mojsisovics, loc. cit. p. 482). 

 In the case of Schlern, where the upper part of this rock is stratified 

 and the lower apparently unstratified, we are told that the lower 

 part is Coral Reef, the upper part is lagoon deposit. But in many 

 portions of this western " Reef," it has been proved that the remains 

 of algje and mollusca form the important part of the deposit. 

 Whether stratified or unstratified, there is no reason why the Schlern 

 dolomite of this Western "Reef" should not be regarded throughout 

 simply as a lagoon and marine formation. In no single case has it 

 been proved that reef-coral continuously built vertical cliffs of Coral 

 rock during the mid-Triassic period of subsidence represented by 

 Esino limestone, Schlern dolomite, etc. 



This typical calcareous or dolomitio rock in the south-west of the 

 district succeeds in the northern and eastern areas, in greater or 

 smaller thickness, the volcanic series and the marls and limestones 

 of Wengen and Cassian age, gradually succeeding the upper horizons 

 of the series towards Enneberg and Ampezzo. The so-called Schlern 

 dolomite "Reefs" of these areas can never be said to be contem- 

 poraneous with the marls at their own base unless, as in the case 

 of the Schlern Mountain, denudation has allowed the rock to remain 

 standing over such an extensive area that the dolomite of one portion 

 is contemporaneous with the marls underlying the dolomite further 

 north. To express the same fact somewhat differently, the fossil- 

 iferous marls and limestones of Enneberg were not laid down against 

 Coral cliffs, but form a deposit belonging to a definite palaeontological 

 horizon, and succeeded by a dolomitic or calcareous rock of marine 

 or lagoon formation. For this dolomitic or calcareous rock between 

 the fossiliferous deposits of ascertained Cassian and Raibl age in 

 the Enneberg and Groden district, it is best to preserve the name 

 of Schlern dolomite,^ as no snfiScient faunal distinction has yet been 

 carried out between different horizons of the said dolomitic rock in 

 the south-western area of its complete development. 



I must refer the reader to my sections and maps already published 

 for further proofs of the conformable succession of Schlern dolomite 

 on the Cassian beds in Enneberg. I shall now recapitulate the main 

 conclusions which may, I think, be drawn from what I have already 

 stated : — 



1. The frequent occurrence of Coral remains in the "dolomite" country is a fact, 

 often repeated, but somewhat vaguely applied, bearing with it no evidence whatever 

 of the Coralline origin of the " dolomites " themselves. 



^ Schlern dolomite : In using the expression " dolomitic or calcareous rock '_' I 

 "wish to take nothing for granted as regards the original or subsequent dolomitization 

 of the rock. This question is outside the immediate interests of the paper. 



