160 PROCEEDINGS OF THE ACADEMY OF [1895. 



were the Frio clays. With the deposition of these clays the Eocene 

 of Texas came to an end. 



Towards the close of the Fayette time there began a series of earth 

 movements the initial causes, or full effects of which, cannot be indi- 

 cated or understood by what we may observe within the East Texas 

 areas. Only a few of the results, and these are small, may be seen 

 there. Hot springs with an abundance of silica in solution appear 

 to have formed a predominant feature and silicious sinters form 

 extensive deposits through several counties occupied by beds of 

 Fayette time. To these solutions of silica we may possibly ascribe 

 the transformation of the fossil wood into the condition it is now 

 found as well as the many deposits of quartzite found in the same 

 portions of the State. 



These earth movements and the deposition of the sinter continued 

 through the deposition of the Frio clays with which many of the 

 deposits are interstratified and while we need not discuss the causes 

 of these movements here it may be said that the ultimate effect was, 

 at least in Texas, to elevate the whole of the Eocene beds into dry 

 land and this condition continued far into Miocene times. 



