4 GEOLOGICAL MEMOIRS. 



the yellow clay with angular fragments of limestone, and the depo- 

 sition of the Loess ; and he claims for this cavern the interpretation 

 suggested by M. Lartet for the celebrated burying-place at Aurig- 

 nac — that the inhabitants had made there their funeral repasts, just 

 in the same manner as many savage nations do at the present day. 



In conclusion, the author gives some details of other caverns in 

 the escarpment of Furfooz, noticing especially the Trou Magrite, and 

 the Grotte de Montfat. [A. S.] 



Geological Map of the Seine. By M. Delesse. 



[Carte geologique souterraine du Departement de la Seine. 4 feuilles. 

 Echelle 1 : 25,000: Savy, Paris.] 



The system followed by M. Delesse in this map is the same as in 

 that of the town of Paris. The strata are indicated by colours, as 

 in ordinary geological maps, the Drift-deposits being omitted. If the 

 strata which compose the subsoils were removed one after another, 

 commencing with the most modern, there would be successively 

 exhibited as much of the surface as corresponds in extent to each 

 of them. The outcrops coloured on the map show the different 

 periods of the formation of the subsoils of the environs of Paris ; 

 and their surface -contour and position above the level of the sea 

 have been represented by means of horizontal curves. 



In this manner are indicated the upper surface of the chalk, of 

 the plastic clay, of the white marls overlying the '^ calcaire 

 grossier," of the travertin of St. Ouen, of the green clays, of the 

 Pontainebleau sands, and, finally, the lower surface of the Drift- 

 deposits. 



It is therefore easy to determine, by the aid of this map, what 

 stata will be met with in sinking at any point in the environs of 

 Paris ; for the colours indicate in succession the beds met with 

 immediately below the Drift. Moreover, when the place in ques- 

 tion lies between two horizontal curves describing the surface- con- 

 tour of the different strata, it is easy to calculate, by proportion, the 

 distance at which each of them would be reached below the surface. 



[A.D.] 



On Secondaet Fossils from Eisenerz. By D. Stur. 

 [Proceed. Imp. Geol. Inst. Vienna, November 1866.] 

 A PYRiTTZED specimen of Ammonites jtoridus, "Wulf., from 2 to 3 

 inches in diameter, an upper Triassic form, well known to occur in 

 the shell-marble of Bleiberg and in the horizon of Halohia Haueri 

 in several Alpine localities, has been lately found in a matrix of 

 nearly black, opaque marl far beneath the horizon of the '^ Sauberger" 

 Limestone, in which pygidia of Bronteus have been repeatedly found. 

 The geological structure of the environs of Eisenerz, together with 

 fragments of yellow molybdate of lead (quite identical with those of 

 Bleiberg in Carinthia) lately found there by miners, leads to the 

 supposition that the Ammonite in question, as also these lead-ores, 

 have been accidentally transported from Bleiberg to Eisenerz. 



[Count M.] 



