Reviews — Triassic Cephalopoda, East Siberia. 39 



III. — Triadische Cephalopod enfaunen der Ostsibirischen Kiis- 



tenprovinz. Von Dr. Karl Diener, in Wien. Mit 5 Tafeln. 



Memoires clu Couiite Geologique. Vol. XIV, No. 3. St. Peters- 



bourg, 1895. 

 The Triassic Cephalopod Fauna of the Coast Province op 



East Siberia. By Dr. Karl Diener, of Vienna. 



IN several localities on the Muravief peninsula, not far from the 

 well-known Russian naval station of Vladivostock, some out- 

 crops of Triassic rocks have lately been discovered by the Russian 

 geologist D. L. Ivanow, which contain a series of Cephalopods, 

 which are described and figured in this memoir by Dr. Diener. 

 A particular interest attaches to some of these fossils, since they 

 show definite relations to the Cephalopods in the Triassic rocks of 

 the Himalaya, now also being critically worked out by the same 

 palaeontologist. 



The Siberian forms indicate two distinct horizons. The newer of 

 these, which apparently is of the age of the Muschelkalk, consists 

 of a dark, rusty-weathering sandstone, containing MonophyUites 

 sicholicus, sp.n., Plychites, sp., and Acrochordiceras, sp. The occur- 

 rence of these together in the same beds is noteworthy, since both 

 in Spitzbergen and in the Himalaya, MonophyUites more especially 

 characterizes the lower division of the Muschelkalk and Ptychites 

 the upper. 



The large majority of the Cephalopoda are, however, from a dis- 

 tinctly Lower Triassic horizon ; they are nearly all casts in a very 

 hard, light-gray, calcareous sandstone. They comprise the following: 

 Nautilus sp. aff. N. quadrangulo, Beyr., Orthoceras sp. aff. 0. Pan- 

 jabiensi, Waag., Orthoceras sp. aff. 0. campanili, v. Mojs. ; Diuarites 

 latiplicatus, sp.n.. Ceratites minutus, Waag. ; Danubites Nicolai, sp.n., 

 Dannbites, sp. ; Ussuria Schmarce, gen. et sp.n., TJ. Ioanowi, sp.n., 

 Pseudosageceras, gen.n., sp.ind., Proptychites acutisellatus, sp.n., 

 P. hiemalis, sp.n., Proptychites. sp., P. otoceratoides, sp.n., Xenaspis 

 orientalis, sp.n., Ophiceras cf. Sakuntala, Dien., Meekoceras boreale, 

 sp.n., Meekoceras, sp., M. (Kingites) Varaha, sp.n., M. (Koninckites) 

 septentrionale, sp.n. 



The Ammonites in the above list chiefly belong to the Liostraca 

 division ; the Trachyostraca forms constitute but a small minority. 

 As regards numbers, the genus Proptychites is the best represented, 

 and the author proposes to distinguish the beds by the name of this 

 genus, which, it may be noted, is also very abundant in the lower 

 divisions of the Trias in the Salt Range. Whilst these Vladivostock 

 beds have no species in common with the Triassic Olenek-beds of 

 North Siberia, they contain two, if not three, species of Ammonites 

 and a species of Nautilus, either identical with or closely related to 

 forms in the Otoceras-beds of the Himalaya, and the author concludes 

 that they may be regarded as belonging to the same horizon of the 

 Lower Trias as these. This is lower than the Olenek-beds, and, in 

 fact, the Otoceras-beds represent the oldest Cephalopod fauna of the 

 Trias. The recognition of this marine zone of the Lower Trias on 

 the Pacific coast is an interesting and important addition to our 

 knowledge of the distribution of this formation. G. J. H. 



