342 FOSSIL REPTILES. 



with. thick foliations, of a whitish grey, ten inches thick, and 

 without fossils. 



The little white skin is a soft calcareous schistus, with slen- 

 der leaves, and about an inch thick. 



The small mussel stone is a coarse-grained calcareous 

 schist, dry and yellowish. It contains an innumerable quan- 

 tity of small limnese, and various other shells of the fresh water, 

 or their nodules, and vegetable impressions. 



The gross or thick plate is a grey schistus with thick leaves, 

 about half a foot thick, and contains only some vegetable 

 fibres. 



The white plate (No. 2,) is a calcareous schist, with 

 coarse grains, very rich in petrifactions and impressions of 

 every kind ; and all that exists separately in the other strata 

 is found assembled here. 



The last bank is a grey or reddish schist with thin leaves, 

 containing innumerable limnese, and very fine impressions of 

 leaves of various colours. It reposes on a bluish coarse sand- 

 stone, which forms, in general, the banks of the Rhine in this 

 country, and where some veins of pit-coal are found, and 

 sometimes numerous mussels, which we are assured belong to 

 the fresh water. 



At about a quarter of a league above the quarry of CEningen, 

 on the same side and nearer to the lake, is another quarry 

 belonging to the village of Wangen, where similar petrifactions 

 were found, and as it would apj>ear, in analogous strata. 



M. Karg, who has described the quarries of QEningen, pro- 

 ceeding on the supposition that all the animals of these strata 

 are the same as in the neighbouring waters, has endeavoured 

 to prove that the strata must have been recently formed in a 

 pond, which became empty in consequence of some accident 

 happening to its dykes. This hypothesis doubtless hindered 

 him from giving us more information regarding their relative 

 position to the neighbouring strata, and thus affording a crite- 

 rion by which to judge of their antiquity. But his opinion is 



