20 GEOLOGICAL MEMOIRS. 



These very analogous or apparently identical species (although as 

 yet no critical comparison of specimens from the two localities has 

 been made) are, however, only such as have not a greater distribu- 

 tion ; whilst, on the other hand, species of more general range, and 

 which hence have a greater importance in the determination of age, 

 are not common to both localities, but are peculiar to one or other 

 of the two. Neither Cardium Hillanum, Exogyra conica, nor Am- 

 monites varicosus, which are frequent at Blackdown, have been fomid 

 in the Aix sand, whilst, on the other hand, Inoceramus Crijisi (a 

 small specimen of which I recognized among the fossils from Vael 

 in Dr. J. Miiller's collection), Belemnitella mucronata, and many 

 other upper chalk fossils, which are well known to occur in the very 

 fossiliferous bands in the Aix sand, have not been met with at 

 Blackdowm. 



In short, I regard the Blackdown beds, which are perhaps on the 

 horizon of the quader- sandstone of Saxony and Bohemia, as being 

 decidedly older than perhaps a part of the Aix sand ; and this last 

 must be placed in the ^tage senonien of D'Orbigny. 



I have attempted to give more exact proof of this and other views 

 relating to the cretaceous formation of the Aix-la-Chapelle district 

 in a detailed report to the Supreme Prussian Mining Court, and 

 which I intend to prepare for the press. Lastly, we may look for- 

 ward to a speedy and important enlargement of our knowledge of the 

 numerous and valuable organic contents of the Aix cretaceous beds, 

 since Dr. Debey * is preparing for publication the results of his long- 

 continued researches on the plant-remains of the Aix Sand, and Dr. 

 Jos. Miiller will soon have ready a new part of his work f describing 

 the animal remains of this formation. 



[T. R. J.] 



On a Tertiary Plant Bed in the Taurus. By Prof. F. Unger. 



[Sitzungsberichte d. K. Ak. d. Wissensch. M.-N: CI. Band XI. S. 1076-1077.] 



In the summer of 1853 M. Theodore Kotschy discovered a fossil 

 plant-bed on the south slope of the Cilician Taurus, in a lateral valley 

 of the lower part of the Cydnus valley, west of the great pass, at a 

 height of about 4000 feet above the sea. 



Eight species of plants have been distinguished by jM. Unger ; 

 who remarks that all these plant-remains belong to the eocene period, 

 and agree with the fossil flora of Sotzka and the plant-bed of southern 

 Steiermark. 



[T. R. J.] 



* See also Quart. Journ. Geol. Soc. vol. vii. part 2. Miscell. p. 109. 

 f Monographie der Petrefacten der Aachener Kreide-formatiou. 4to. 



