114 



GEOLOGY OF THE YELLOWSTONE NATIONAL PARK. 



Table VIII. — Grades of crystallization of the dike and stock rocks of Electric 



Peak — Continued. 



Grade. 



I. II (a). 



II (i». 



II («). 



III. 



rfi to du,. s t . 



s 2 . 



H- 



Si and du. 



22 





271 



272 



273, 274 







328, 329 



330, 331 



332 



333 



23 









24 







316 



25 



26 



234 







317 



275, 276 

 277 





27... 





308 







28 





278 

 279 









29 











30 



31 



32 





280. 281 



i 





282. 283 









284 







33 





(• 285 

 I 286, 287 











34 







288 

 289 



309 

 310 







35 





318 



334 



36 





311 



319 





37 





< 320 

 I 321,286a 







zyu 





38 









291 312 

 294 313 





39 









40 





295 





c 275n 

 1 322, 323 





41 







296 

 297 

 298 







42 











43 









44. . 





299 

 300 





45 

















Table VIII expresses the relative degree of crystallization of all the 

 intrusive rocks collected from the stock and dikes of Electric Peak. They 

 are arranged in the groups already described. The breaks in the different 

 columns do not signify breaks in the gradation of crystallization in the rock 

 bodies in the field, but simply that the specimens collected are not from all 

 the different structural phases of the different rocks. However, the clus- 

 tering of the numbers in particular parts of the scale indicates the prevailing 

 grain of the rocks as they are exposed at the present time. 



