1 40 Dr Boue’s Geological Comparative View of the 
The shell limestone ( muschelkalk ) of Wirtemberg or of Wurz- 
burg, is in every respect the same as that of the north of 
Germany, and above it comes the quadersandstein , or third 
flcetz sandstone, which surrounds the Jura chain, and lies 
under it. The most interesting parts of this deposit are 
the environs of Amberg, where it contains short beds of marly 
rock, with vegetable impressions (Lycopodites), or siliciferous 
beds, and a kind of coarse tripoli with carpolites. The lias 
Ties above it, and alternates with argillaceous and sandy beds : 
it is a compact marly rock of a greyish colour, or slaty, 
with Gryphites arcuata, Plagiostomata, Ammonites, Belem- 
nites, Mytiloides, Reptiles, &c., in short, with all the fossils 
common to the lias and alum-slate of England ; so that I 
would recommend this part of Germany to the study of those 
English geologists who are inclined to confound the shell lime- 
stone (muschelkalk) of Germany with the lias, because the 
first deposit does not appear to exist, or but very sparingly, 
in their own country. This formation is also very interest- 
ing, from its clay containing masses of brown iron-ore, or hy- 
drate of iron, which are wrought with advantage, and which 
rarely contain small veins of wavellite, and of oxide of manga- 
nese, and are here and there changed by the quantity of marine 
exuviae into granular or compact, or even into beautiful crystal- 
lized phosphate of iron (Amberg). The well known nests of 
compact and reniform phosphorite are also found in a clay sub- 
ordinate to the lias of Amberg. 
In Wirtemberg, the quadersandstein becomes always thinner 
as you proceed to the south, and forms patches upon the shell 
limestone (muschelkalk). Then the shell limestone (muschel- 
kalk), also occupies a narrow line between the red sand- 
stones of the Black Forest and the lias; and, at last, on the 
Rhine and in Switzerland, this shell limestone (muschelkalk) 
appears only with its highest parts among the lias and Jura 
limestone ; it is the Rauchgrauer Kalk of Mr Merian. 
The German Jura chain forms a great promontory or digue , 
filling up a cavity which rises to the north, and is deepest to- 
ward the south. As I have already shown, it consists of five 
different parts : !<?£, The lias and its marls, which are the con- 
necting part between the Jura deposit and the quadersandstein ; 
