rs ^^'-f^ra 



M^ ^UlVjMD^ 



cQ js: 



i/'s-^v'-j^i^cr 





>j«ll 



lUOl 









Si 



^uol/t/ \ 







«2 H ^ 



265 



petioles and roots. The 

 stem is of the type shown 

 by Ankryopteris grayi, but 

 the petioles are of the sim- 

 ple type seen in Clepsy- 

 dropsis(^i). Ankryopteris 

 has, so far, been found only 

 at horizons from the Lower 

 Coal-Measures to Permian,* 

 but Chjjsydropsis is said to 

 be one of the most common 

 in the Devonian beds of 

 Thuringia. This peculiar 

 association of Carbonifer- 

 ous and Devonian charac- 

 ters is remarkable, especi- 

 ally as the field-work indi- 

 cates that it occurs near 

 the top of what has been 

 assumed to be the Upper- 

 Devonian Series. Other 

 evidence mentioned below 

 (p. 269) indicates that we 

 cannot yet be sure where 

 the line of demarcation 

 should be drawn between 

 the Devonian and Carbon- 

 iferous series. 



West of the river, the 

 mudstones have an ever 

 increasing westerly dip, 

 and include a large mass 

 of blue argillaceous lime- 

 stone. Near Portion 106, 

 Parish of Burindi (the 

 type-locality for the Bu- 

 rindi mudstonesj, the mud- 



Text-fig.9. 

 GeologicaleSection through Burindi. 



