436 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 10, 



of which has recently been worked out in Silesia by M. Eck*. Now, 

 as the rocks of the Alpine so-called Muschelkalk (Guttensteiner 

 Kalk of the Austrian geologists, and particularly Yirgloria Kalk of 

 Kichthofen) entirely agree with our Wellenkalk, this rock ought 

 henceforth to be called Wellenkalk ; and no representative of the 

 true (upper) Muschelkalk has hitherto been observed in the Alps. I 

 win not at present aUude any further to the Plora of the Trias, which 

 is developed in Franconia with greater richness than anywhere else, 

 because my colleague. Professor Schenk, is about to publish two 

 works on the subject, accompanied by excellent illustrations, one of 

 which will give the Flora of the Keuper, which, near Wiirzburg, 

 contains about thirty species, the other, that of the Bone-bed (Ehsetic 

 formation), from all the materials to be found in Bavaria, with 25 

 plates. 



Jura. — During the last few years my studies in Baden were par- 

 ticularly directed to the Middle Jura, which, at the western extre- 

 mity of the Black Forest, belongs entirely to the Swiss-Burgundian 

 type. This latter formation has been but slightly studied in Ger- 

 many, and it could only be superficially alluded to in the valuable 

 work of my friend Oppel. I have followed up aU the beds, from the 

 brown Oolite '^i^ Ammonites Humphriesianus, Sow., to the uppermost 

 limit of the Cornbrash, in Breisgau, with great detail, and have found 

 . the following order of superposition : — ■■ 



I. Fine-grained white Oolite, with Ostrea acuminata Feet. 



and EcJiinobrissus Renggeri 450-500. 



II. Hard hmestone, with oolitic masses, in which Neri- 



ncea Brucknen is inclosed 8. 



III. Marly oolite, argillaceous at the base, with Am- 

 monites ParTcinsoni, A. ferrugineus, 0pp., Hyho- 

 clypus gihherulus ca. 10. 



IV. Cornbrash, ash-grey and yellow decomposing marl, 

 without oolitic grains ca. 40. 



The bed No. I. was formerly considered identical with the 

 English " Great Oolite." I disproved this in 1857, by finding Am- 

 monites ParTcinsoni in bed No. III. whereas in England it always 

 underlies the Great OoHte. On the whole, I have now found forty- 

 seven species in No. L, of which thirteen had hitherto been referred 

 exclusively to the Inferior Oolite (zones of Ammonites Humphnesia- 

 nus and A. ParJcinsoni), fourteen in these and in the Bath group 

 (Forest Marble, Great Oolite, and Cornbrash), and sixteen only in 

 the Bath group. To the latter belong the very common Terebratula 

 intermedia, Sow., Avicula echinata, Sow., Apiocrinus elegans, &c. The 

 Faunas of the Inferior Oolite and of the Bath group are by no means 

 so sharply separated as has been hitherto assumed, and in the Swiss- 

 Burgundian Jura-formation the horizon of Ammo7iites ParTcinsoni 

 acquires a development and extent of stratification such as never 



* Wiynchonella decurtata, Gur., Spiriferina fragilis, Schlotli., Sp. Mrsuta, 

 Alb., Wahlliemia angusta, Schloth., and Pentacrinus dtthiiis, Goldf. are charac- 

 teristic forms. 



