THE C(EUR D'ALENE MONZONITE 



687 



Creek outcrops. When, in addition to this striking hnear arrange- 

 ment, we consider the fact that nowhere throughout the other 

 extensive areas of Idaho acidic intrusives as described by Lindgren, 



fnica-^tz.- /nanzo/tite, with. i-- *- /^ t- 

 Soma grQ.no-<iiorite fmica) t, «.- ^ 



ho^nhlende monzonite 



Fig. I. — Acidic intrusives in Northern Idaho: i, VermiUion Creek, Montana; 

 Black Prince Creek; 3, Gold Hill; 4, Coeur d'Alene District; 5, Thatuna Hills. 



