Mineralogy and Geology. 281 
speaking, far less known than that of the coal formation which is of a 
far older date ; and even in Silesia, notwithstanding its numerous and 
acquaintance with the riches of this recently discovered deposit is as yet 
t with in other ter- 
necessarily very imperfect. Palms, whic 
in the clayey mud. This recently discovered deposit bears out the idea 
that although the majority of the genera of the plants occurring in the 
etliary formation are similar to those now met with in Europe, al- 
_ though the species are different and agree rather with African forms 
Srconp Sens, Vol. XIV, No. 41.—Sept, 1852. 36 
