752 TIIK GEOLOGY OF MINNESOTA. 



|T. ..... nylr. I run Ore. I.HlMrt/.vti' . 



No. ItiJtOA. TACONYTK. 



/iV/'. Aniiiial Krport, \xi, |>(jrs H'J, SI. I."):!; vol. iv, pii^'r .'I'.H . 



Mr//. Halls a.boiil one t hinl of ;ui inch in diameter from No. 1, siliceous, and 

 lighter colored than No. 4. 



Mic. The rock is the same ;is thai section of No. !(>:>(), which shows the 

 lacoiiitie. structure, except thai it is less ferruginous. The taconit ie globules are 



surrounded by a rim of iron ore. Compare No. r>-'!o. One section. 



.!//<. Aiiimikie. N. ". \v. 



No. Idol. IKON OKK. 



Nn. '.i nf |.|n- ilrill I-IIIT ill Wicks'. 



l Kr|M)rl, \vi, |i;it;iHS'J, SI, l.'ki; Anniiiil i;c|mrl, \\ii, |iiif,'o Ilil. 



Mi;/. M;l!^lict ill'. 



Mir. Kelli'ctcd light shows I h;i! (hi- ore einliriiccs liotli linitufi/i' and nid/j 

 ( >ne ( I hick) section. 



Age. Aniinikie. N. 11. \\ . 



No. \ ('<'-. t 



No. i; of I he ilrill :it Wicks'. 



i;,f. AnniKil i;i-|iorl. \\i, pairrs S'J, I.">:1; Ai ..... ;il IJcporl. sxii, ]>.'ii;i> IT>I ; vol. iv, pn^c .'i'.U. 



Me;/. Pinkish qiiarl/yte, tine grained. 



Mif. The rock is a little stained liy lii'innfi/c. Mingled with the interlocking 

 <lititr/;<'x a.re a l'e\\ grains of some I riclinic j'c/i/s/tur, \ er\ tine needles of <icfiin>/iir 

 lying scattered in the (|iiart/yte mass, and occasionally a green hornblende shred 

 of larger dimensions and rarely a small epidote. One section. 



.[<!<. Aniinikie ( I'okega.ma'). 



lu'iinirk. This rock was originally essentially a clean quart/ sand, and it has 

 been changed by interstitial quart/,, which has rendered the grains angular. At the 

 same lime there is no evidence of any of the "taconitic" quart/ in the slide, 

 although there are some grains that are nearly isotropic and contain hematite dust, 

 wliich ma\ have been originalh of the same nature as the globular masses that 

 characteri/.e the taconyte. N. H. w. 



No. IC>:!;:. ( k >i AUT/.YTK. ('ci<ixti<:) 



No. 7 ,.f tlic ilrill ;il Wicks'. 



/,'./'. Annu.-il l.'cpori. \\i, pjiircs S'J, l.\'!; Annual Koport, \\ii, pai;,- liil ; vol. iv, pajj" :i!2. 



Mi;/. Quart/yle, partly I'ragmeiital. 



Mi<: The three sections illustrate different conditions of this rock: 1. Krag- 

 UHMital grains of ,/inni:. perfectly rounded and mostly of uniform si/e, but with 

 Secondary borders interlocked in a surrounding matrix of secondary line, taconit ic 

 quart/.. Within one of these larger rounded grains of quart/ is a small :7mw( ?) 

 crystal, its length about four times its \\idth. >J. The rock consists wholly of 



