226 
Proceedings of the Royal Irish Academy. 
dipliya, occur at Inwald and Hoczyny, on tlie northern margin of the 
Carpathians, at Rogoznik, Czorstyii, &c., in the region of the Klippen- 
kalk of the same chain ; at Pirgi and other places in the Austrian 
and Bavarian Alps ; at Wimmis, near the lake of Thun ; and Mount 
Saleve, near Geneva; the coral rag of Echaillon, Mont du Chat, &c,, 
in the departments of Isere and the Basses Alps, near Marseilles, in 
the Cevennes ; and possibly the white and grey limestone rich in corals 
and gasteropods with Terebratula janitor, and T. Moravica in jN^orth. 
Sicily, described by Professor Gemmellaro, and the red limestone with 
Terebratula diphya of the Sierra de Cabra in Spain. 
We are less concerned at present with the eastern development of 
the Tithonic Stage than with its western extension. Leaving out of 
consideration, therefore, the Stramberg and Rogoznik beds, we shall 
give the conclusions of Herr Zittel, the latest writer on the subject, 
regarding this western extension of the stage in Switzerland and 
Prance. 
1. In the region of the Hispano-Alpine Province the jurassic for- 
mations are closed above by a coralline facies whose fauna has nothing 
in common with the lower chalk, whilst the greatest analogy with the 
upper Jura may be detected. 
2. All true Alpine Jura beds of this region are older than this 
coral rag, and, as a rule, the "Zone of Ammonites tenuilobatus " im- 
mediately underlies it, although in one place (the Simmenfluh, at 
Wimmis) a Myacitus-facies of the kimmeridge underlies it. 
3. ]^o palaeontological agreement with the fauna of any determinate 
extra Alpine jurassic horizon can as yet be determined ; but from the 
stratigraphical relations, and the palaeontological facts, it is certain 
that the beds in question represent either the upper part of the kim- 
meridge, or the beds between the kimmeridge and the lower cretaceous 
formation. 
We have entertained, for several years, the opinion that the Tithonic 
Stage may be traced still further ; that the great dolomite bed of 
Santander, in northern Spain, forms part of it, and that the shelly 
limestone underlying this dolomite probably represents the Zone of 
Ammonites tenuilobatus," but we delayed putting our opinion on re- 
cord until we should have an opportunity of completing our former in- 
vestigations on the geology of the Cantabrian Pyrenees, and especially of 
making a more or less complete collection of the fossils of the Santander 
and Asturian beds. Since we became acquainted, however, with the 
papers of M. Coquand, on the rocks in the neighbourhood of Marseilles* 
and in the Cevennes. f We are fully convinced that the dolomite be- 
longs to the zone of Terebratula diphya, and wish, therefore, to place 
our opinion on record. 
Before describing the results of M. Coquand's researches, and their 
* " Bulletin de la Societe Geologique de France," t. xxvi., p. 100. 
t Ibid.^ xxvi., p. 834. 
