2. Phyllite formation. 



B. Sedimentaries : 



I. 



Lower Palaeozoic formation. 



Cambrian. 



Middle Paleozoic formation. 



Ordovician to Devo- 



nian. 



Older Upper Pahcozoic formation. 



Dinantian and Mos- 



covian. 



4- 



Younger Upper Palaeozoic formation 

 Lower Mesozoic formation. 



Permocarboniferous. 



5- 



Triassic (Rh.t^tic ex- 

 cluded and the 

 Upper Thuring- 

 ian included). 



6. 



Upper Mesozoic formation. 



Rha;tic-Jurassic, in- 



cluding a part of 

 Cretaceous. 



7. Quartz trachyte tuff and red sandstone formation. 



Post-Cretaceous and 

 Pre-Pliocene. 



8. Red formation (3 Red basin formation of Richthofen and 



Loczy), \ccss and alluvium. Pliocene and later. 

 This undertaking must have been accompanied with considerable diffi- 

 culties, because there is a veritable lack of harmony among the authors of 

 each chapter concerning the geological divisions and other points, from 

 which it is difficult to escape in such a work as this. My first plan was to 

 work out all the stratigraphical details given by them, in order to bring these 

 into combination with the results obtained by our palreontological studies 

 of the collected materials ; but unfortunately this plan had to be soon 

 abandoned, as it became evident that such an effort demanded much more 

 time than could now be devoted to it, and I am obliged to satisfy myself with 

 presenting in this volume what can directly be deduced from the palaeonto- 

 logical data. The divergence of opinions between the geologists concerned 

 in this geological research on one side and me on the other was inevitable, 

 in spite of constant efforts to carry on necessary correspondence. This was 



