414 



llei (p. 277) 

 brownish laye 



^s 



3 2 



c3 ^*^ 



00 c? 



a 35 



.d 



. ^ 



a .2 ^ Q 



-H So - "^ 35 t~- 



cp 



d, 



_ ~j 



/A CO 



i a 



ti 







ph 



2 'S3 



^ BH 



1 = 



111 



rt 



3 d H 





o 



?SI-3^ 

 Bllll 



NIS B 



o 2 



d o 

 o r3 

 -; t> ^ a) 02 



^ 3 ' - ^ ,S b a 

 +j cs 'w p TJ *3 o 



| Sr |oo 



