162 THE MARQUETTE IKON I'.HAKING DISTRICT. 



no traces of a tVa^-iix'iital structure can lie (letecti'd uutil tlieir thin sections 

 are examined niicrosco|)ically, and also some H<>-lit-colored acid si'liists, 

 idonticul in all their features with those amonii' th(^ Mona schists. All 

 these schists are cut by large and small dikt's of altered diabase, and by 

 a few acid dikes. Hut the conglomeratic schists ai-e the |iredominant ones, 

 and are tlR)se that give character to the western portion of the green-schist 



are; 



'{'he topography of the countrv coverr<l l)y these rocks is not very 

 dilferent from that of the country underlain !>)• the Mona .schists. Isolated 

 rounded knolis are not so frequent in the area of tlie "conglomerates" as in 

 that of the .Mona schists, but the larger hills have the same character in both 

 areas. Drift is U-ss thick in this district than in that of the .Mona schists, the 

 larger hills being oftener separateil from one another by swamp lands than 

 by drift deposits. 



ItEI.ATIONS TO .VD.TACENT KOCKS. 



Tile ndations of tin* Kitchi schists to tlie altered tulfs of the Mona 

 schists have alreacU' been (Uscribed. Tlie relations of tlie Kitchi sciiists to 

 the granite on the west are observable north of the west end of a pond 

 in the S\V. ', sec -JC, 'W 4S X., R. "28 W. (.Vtlas Sheet XXI), where they 

 seem to be the same as the relations i-\isting between the Mona schists and 

 the graniti- north of these rocks. In passing from the schist to the granite, 

 dikes of the latter rock hrst appear in the former: then the granite gradually 

 becomes predominant, schist la\-ers being interlaminated with tin' dikes or 

 anastomosing through the granite in an irreyidar maimer. Passing into the 

 granite the schists are found included in it as angidar blocks, and hnally 

 the massi\e rock appears completeU' Iree t'rom the schistose one. The 

 granite is therefore clearly intrusive in the Kitchi schists. The sedi- 

 meiitarv rocks north and south of the schists repose unconformably upon 

 till' latter, from which they are separated by true conglomerates. 



rETROGRAlMIlCAL eUAl!A( TER. 



IIASIC S( MISTS. 



Macroscopicai. — Irviug, iu liis iutroiluctiou to Williams's article, already 

 rejjeateclly referred to, describes the Kitchi schists as greenish schists, with 



