NOMENCLATURE OF KEWEENAW AN IGNEOUS ROCKS 771 



Magdebur- 



GOSE 



Tehamose 



Lebachose 



Umptekose 



No. 17,039 No. 17,007 



ab. 

 an. 

 ne. 



di.... 

 hy... 

 ol.... 

 mt... 

 hm. . 



48.90 



26. 13 



18.34 



3.61 



18.60 



70.61 

 0.52 



o. 70 

 1.28 

 1.03 



4. 16 

 3-66 



1-43 

 0.86 



0.42 



Total. 



99 56 



100. 27 



100.64 



100-55 



100.07 



It is to be remarked that not one of these rock types described by 

 Hubbard corresponds chemically with any variety described by any 

 other author. The fact suggests possible inaccuracies in Hubbard's 

 analyses. 



Lane's analyses, as well as Hubbard's were overlooked and omitted 

 from Washington's tables. Recalculations of the analyses given 

 by Lane yield the following norms: 



