PUBLICATIONS. Wie 
abundance, until granite becomes the predominating rock. The schists 
are also cut by dikes of greenstone. 
Elftman,* in 1894, publishes his field notes on Northeastern Min- 
nesota. In the region north of Snowbank Lake are found conglom- 
erate, mica-schist, sericite-schist, argillite, diabase, conglomeratic 
greenstone, porphyry, augite-granite and hornblende-granite. The 
former of these granites has heretofore been called gray syenite, and 
the latter red syenite. 
On the west shore of Boot Lake, in the S.W. 4%, N.W. Y, Sec. 21, 
T. 64 N., R. 8 W., are several large dykes of porphyry cutting the 
graywacke and schist. In the S.W. 4, N.E. ¥, of the same section, 
on the east side of a long point, dikes of granite are found cutting the 
conglomerate in all directions, and distorting the strata in a very com- 
plicated manner. In the conglomerate are bowlders up to four feet in 
diameter of gneiss, slate, diabase and granite, the last being scarcely 
distinguishable from the granite which cuts the conglomerate. In 
some instances a granite dike was found to cut some of the large 
bowlders of the conglomerate, when the contact between the dike and 
the granite bowlders could not easily be‘determined. The exact rela- 
tions of the hornblende-granite and the augite-granite to each other, 
and the relations of the latter to the sedimentaries, are still doubtful. 
The gray granite has not been found in contact with the schists, 
argillites and conglomerates, and it is cut by the red granite, which 
also cuts theschist. The hornblende-schists and mica-schists of Snow- 
bank and White Iron Lakes grade into argillaceous slates and con- 
glomerates, the schistose character being most fully developed at the 
contact with the granite. 
The Animikie actinolite-magnetite-schists are derived from rock 
containing an original iron carbonate. As the formation thins out 
toward the east, and passes under the gabbro, it becomes more crys- 
talline. Near the contact of the gabbro augite and olivine occur inti- 
mately associated with the actinolite and magnetite of the Animikie 
schists. The black slates have been changed into biotite-schist in the 
proximity of the gabbro. These slates disappear before the Dunke 
River is reached, having been removed at the time of the gabbro intru- 
* Preliminary Report of Field Work during 1893 in Northeastern }Minnesota, by 
A. H. ELFTMAN. Geol. and Nat. Hist. Sur. of Minn., 22d Ann. Rep., Part XII, pp. 
141-180, 1894. 
