286 Rev. W. D. Conybeare on a Geological Map of [April, 



well exposed in the descent from the memorable planes of Jena. 

 It is covered by quadersanderstein, on which, according to 

 Haussman, Keferstein, Boue, &c. repose in the north of Germany 

 marls, oolites, ferruginous oolites, and chalk. 



Some observations of Prof. Buckland indicate considerable de- 

 rangement in the Brunswick district ; a ridge of chalk extends on 

 the north of the Hartz towards Goslar, often in highly inclined 

 beds, and forming a hog's back ; yet on the north of this, where 

 the more recent deposits might be expected, the variegated sand- 

 stone again protrudes. 



South of the Thuringerwald, the same muschelkalkstein 

 extends by Heldburghausen and Cobourg. 



(E.) Central Germany. 



According to Boue and Humboldt, the platform of Wurtz- 

 bourg considered by Keferstein as zechstein, or alpine lime- 

 stone, is muschelkalkstein. I have already alluded to its posi- 

 tion in describing the alpine limestone. If this view be correct, 

 the sandstone between Wurtzbourg and Bamberg is not, as 

 represented by Keferstein, buntersandstein, but quadersand- 

 stein. 



(F.) Great Range of Franconia, the Swabian and Bauhe Alp, 



and the Jura Chain. 



This is an immense and continuous band principally occupied 

 by the oolitic series, crowned in some places by still more recent 

 deposits of the same age with the chalk marl, Sec. of England. 



In the most northerly part of its course through Franconia, it 

 forms the platform between Bamberg and Bayreuth. We have 

 here a compact limestone (celebrated for its caverns containing 

 the remains of fossil bears), &c. a sandstone, and some marly beds 

 much resembling in fossils and character our chalk marl : this 

 system rests on the sandstone extending between Bamberg and 

 Wurtzbourg. It is to be regretted that the obscurity which still 

 hangs over the relations of this tract affects equally the superin- 

 cumbent limestone, See. Boue considers this sandstone as 

 quadersandstone and the limestone as representing the whole 

 oolitic series. 



Further south, he gives the following as the section presented 

 near Amberg : 1. Quadersandstein. 2. Ditto with hydrate of 

 iron. 3. Lias, with gryphoea arcuata, gryphcea gigas, belem- 

 nites, Sec. 4. Argillaceous rocks with hydrate of iron, ammo- 

 nites, mya, cerithia, &c. 5. Several varieties of Jura limestone, 

 magnesian compact, and oolitic. 6. Marl, with hydrate of iron. 

 If the gryphcea gigas be the same with the gryphcea ddatata. 

 This series is in the ascending order. 



I should prefer considering the deposit No. 2 as our Oxford clay. 

 I should then identify the deposit here called quadersandstein 



