^i Rdfioii'il Vicir of flic Kt'im'iKi iiut II . — W'i iiclull . 157 
6a;K?e</./V?.s7>e/-.v in the older strata, and they are repeated in 
the Mesabi rocks, owing to the recurrence of the same causes 
and conditions in the time of the Mesabi iron ore, or owing to 
the existence of conglomerates in the Mesabi rocks derived 
from the older rocks, but there are no taconyte jaspers in the 
older rocks; at least, during all the time that the members of 
the Minnesota survey have studied the older rocks none have 
been found, and they have not been reported from the lower 
strata by any other geologist. Dr. U. S. Grant, who detected 
this taconyte in this conglomerate, has kindly made the ac- 
companying drawings which show these taconyte grains mag- 
nified about thirtv diameters. 
Figure 2 (Minn. (icol. Sur. No. H.)2 Bl and Figl-re :J iMinn. (icol. Siir. X... ,H.-)2C). 
Thin .sections of taconyte pi^bbles in the conijlonn'rati- at Courtland, Nici)llt't Co., 
Minn. The black, botli solid and dots, reprcsmt-; hematite. The white, both be- 
tween and in the granules, is very finely crystalline silica. Tlie iron ore thus not 
■only coats the surface of the granules, but penetrates into them and sometimes 
makes up whole granules. Magnified about thirty diameters. 
This seems to prove that the Sioux quartzyte, the New Ulm 
quartzyte, the Barraboo quartzyte and the Barron County 
quartzytes are of the same age, since they have always been 
linked under oiu' grouping by all wlio have classified them. 
Being pr»st-Mesabi and ])ost-Penok('e and ])re-Kewei'nawan the 
question next arises, wheri' are they to b ■ lOiiml in the Peno- 
kee region? 'I'Ik'H "/''' lu'lmr thf Ken'fPua ica n (/id/utsra. It is 
a fact, which lias not attractetl niiu-h attention, that there is 
a considerable ((uartzyte antl conglomerate l);'low the Kevvee- 
nawan diabases in th" P<'ni)ke,' district. Tin- writer first, so 
