24 GEOLOGICAL MEMOIRS. 



the underlying Gedinian appears to be a feeble exhibition of the 

 lower Silurian. 



The uppermost Devonian — the Cypridina-slates or Petherwin 

 rocks — do not occur on the Meuse ; but the Carboniferous series rests 

 on the middle Devonians, which are much overthrown, but may be 

 seen to be supported by lower Devonians, and these by lower Silurians. 

 Cambrian rocks form the contour of the beautifully wooded gorge 

 of the river southwards ; and slate-quarries mark the commencement 

 of their reign. [S. R. P.] 



On the Fossil Faunae of the Equivalent of the Bone-bed between 

 the Keuper and the Lias. By Dr. A. Oppel and Dr. Fred. 



ROLLE. 



[Proceed. Imp. Acad. Vienna, October 1857.] 



The organic remains common to the Triassic, Liassic, and Jurassic 

 formations of Central and Northern Europe and to the coeval, 

 although very differently developed, deposits in the Alpine and 

 Mediterranean regions, are but few in number ; their closer investiga- 

 tion, however, is one of the most promising objects of Palseontological 

 studies. Dr. Albert Oppel and Prof. E. Suess's paper " On the pro- 

 bable Equivalents of the Alpine Kossen-strata in Suabia* " opened a 

 new way for stating the real relative age of the Alpine Secondary rocks, 

 showing the Kossen-strata t to have their equivalent in Wurtemberg 

 in the yellowish-white quartzose sandstone intercalated between the 

 Keuperian red marls and the Liassic blue limestones. 



Two other papers £, — one by Dr. Oppel, "Further proofs of the 

 existence of Kossen-strata in Suabia and Luxemburg," the other by 

 Dr. Fred. Rolle, "On some organic remains, appearing in Suabia on 

 the limit between the Keuper and the Lias," — may be considered as 

 complementary to the before-mentioned memoir. 



Dr. Oppel added to the fossil forms known to occur in the Bone- 

 bed-Sandstones (Prof. Quenstedt's " upper or yellow Keuper-Sand- 

 stone") a new species of Anatina {An. Suessi), and described an 

 identical fauna of some other Suabian localities but very imperfectly 

 known before. Among these localities Tabingen § is particularly 

 interesting, as being the place in south-western Germany where the 

 Bone-bed sandstone has been first recognized and described. Alberti || 

 was the first geologist who described, under the name of fossiliferous 

 sandstone of Tabingen, the strata now acknowledged to be the equi- 

 valents of the Kossen-beds (Alpine Limestone) as a distinct member 

 of the Triassic group. The presence of Mytilus minutus, Goldfuss, 

 and Cardium cloacinum, Quenstedt, affords sufficient evidence of the 



* Quart. Journ. Geol. Soc. vol. xiii. Part 2. Miscell. p. 1. 



t See Quart. Journ. Geol. Soc. Part 2. Miscell. p. 25. 



% Proceed. Imp. Acad. Vienna, October 1857. 



§ Tabingen is not to be confounded with Tubingen, near Stuttgart, the seat of 

 a celebrated University. 



|| ' Monographie des bunten Sandsteins, Muschelkalkes und Keupers,' Stuttgart, 

 .1834. 



