332 Professor Sedgwick and Mr. Muuchison on the 



resembles the A^. Ixcvigatus ; a third is distinct from any species we have seen 

 fig-ured. The limestone also contains Spatangi, Pectens, &c. 



The fossils in the calcareous shales and beds of iron ore are very numerous ; 

 but unfortunately they are nearly all in the state of casts, so rude as not to 

 permit their species to be well distinguished. Amongst them are Spa- 

 tangi resembling those of the chalk and green-sand * ; several species of 

 Terebratulae, one of which resembles T. suhrotimda, another is near T. lam- 

 pas ; Spondylus ; Plicatula ; a univalve near to Cirrus plicatus ; Astarte ; 

 Anomia ; Isocardia ; Gryphcea vesiculosa (?); two or three species of 

 Pecten, one of which resembles P. rcconditus ; Serpula ; and Belemnites; 

 but the most abundant fossils of the deposit are Crustacea. 



Prom these details, and the accompanying section, it appears that the num- 

 mulitic limestone and iron ores of Sonthofen, are in the highest part of the 

 green-sand and cretaceous system of the Alps. But in following the secondary 

 ridges towards the east, we shall afterwards show that this numnuditic system 

 is very largely developed, and that it passes into higher strata, in which the 

 secondary fossils gradually disappear, and the greater number of the imbedded 

 shells begin to conform to the tertiary type. 



If the line of section, just described, be prolonged to the south of the Starz- 

 lach, the nummulitic limestone is, as before stated, again found to alternate 

 with calcareous, black, slaty shale and fine-grained grits ; the prevailing dip 

 being to the south f . But if another section, parallel to the former, be made 

 on the opposite or western side of the valley of Sonthofen, it traverses a suc- 

 cession of ridges of fine green-sand, having the same general direction (from 

 W.S.W. to E.N.E.), and the same prevailing dip. They are, however, no- 

 where overlaid by the strata containing iron ore. 



In the higher part of the Sonthofen valley, near Ober Mieselstein, is a tribu- 

 tary torrent called the Schinberger-Ach, flowing between the Schwarzenberg; 

 and the ridge of the Bolghen. The former mountain is composed of compact 

 limestone and calcareous, green grits ; the latter of thick-bedded, brownish, 

 cherty sandstone surmounted by grits and calcareous shales with innumerable 

 impressions of Fuci, amongst which are Fucoides intricatus, F. Targioni, 

 and F.furcatus of M. Adolphe Brongniart. In other ridges on the left bank 

 of the Iller, between Ober Mieselstein and Sonthofen, there are similar asso- 



* These fossils are unquestionably distinct from any of those in the iron beds of the Kressen- 

 berg (Plate XXXVI. fig. 7.), described by Goldfuss and Count Miinster. 

 t Plate XXXVI. fig. 4. 



