TERTIARY AND POST TERTIARY FORMATIONS. 113 



there are lens of pure plastic clays to be found in 

 many places interstratifled with tli* prevailing sands 

 of the formation. Many of these clays have been re- 

 ceived and superficially tested, but it is the intention 

 to extend the present investigation over that part of 

 the state in the near future. 



