NO. 12 



S.MITIISOXIAN EXPLURATIOXS, 1^17 



The geological field-work by Secretary W'alcott in the Rockv .Moun- 

 tains during- recent years has yielded important additions to our 



^i-^Jbmi 



Fig. 2. — Burgess shale fossil (|iiarry lila-^ud oui on tlu' sUc-p slnpf of 

 the ridge between Mount VV'apta and Mount l-'iild at (j./oo feet above 

 sea level and 8 miles hy trail from I-'ield, Firitish Columliia. 



The fossil-hearing layers are just heneath the surface uin'ii wliiih llie 

 men are standing. Photograph hy W'alcott, HJI4. 



knowledge C(jnccrning tlie ( anihrian and pre-t anilirian l<irnialii)ns 

 and has brought to light c\i<lences of life far earbrr tlian benlofurc 

 known. The results of nuirh of thi-. wmk in tlic Tu-ld and suli'~ei|uenl 



