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ii6 



RELICS OF PRIMEVAL LIFE 



mina and magnesia occupying a large place in the 

 mineralizing silicate. Fig. 24A gives two illustrations 

 of this — one a crinoidal stem from the Silurian of 

 New Brunswick, injected with a silicate of alumina, 



b>* *-«w»,.- jt *SultL' ■ •' ' "•"•"••►•isC 

 «••,**.-.. ■*^'lKli^/l'> .I'^h't^ifl 



r-i ^* '" * - . r; wriwrr .... ■ / -■•■ •: j'/afl 



«■ «.>^.t -.rj 











m 





n4f «• «•■••-.., 



lit,'. -J " 



;.:..s-:;-.; 'iff' JW;-. ■:;.?: 



,■'1 ••. .'V. -.r ._ 



«' r - '; 1 " 





i 





Fig. 24A. — ((?) yi^/w/ <?/■ Crinoid injected with a Hydrous Silicate, 



Silurian, Fole Hill, Neiv Brunsivick. (X 25.) 



ip) Spiral Shell injected with a Hyds'otis Silicate allied to Serpentine, 



near Llangwyllog, North Wales, (x 25.) 



iron, magnesia and potash ; the other a spiral shell 

 from more ancient perhaps Cambrian rocks in 

 Wales, filled with a silicate apparently more nearly 

 related to serpentine. Further examples will be re- 

 ferred to in an appended note. 



n 

 4 



\ 



