THE GEOLOGICAL SECTION OF MICHIGAN 



395 



Character of Rock 



Sane/, grayg/, bouiJar c/ajf 

 Lake Superior pink c/oy 



77//' bou/der ckjy, somefsmea very jondy. agam c/oyey and dark. /f 

 grvy sndf^ f7imei/tn soma p/aces tedcisjguis/ted.aaalderattc/Q younger 



LiQhf i^c//^ larrdsftjne and ■jfflTOi- sha/ea 



coa/joufj block axitf^fBahoJbs.rtKn bands 

 arxf of sK/Kr/rsrav, rar efy drt^e/7 ip and fo andm fragm&tfs of/be 

 l/ierates. afsaofwfi/fe quarrz 



/igAfan<fd/msb, cAer/y, a/so ca/carcous sandsfOnes. 



Dark orii/ua/i //avsfones anddotomfts n-/fh gypsum aw/b/ue or 

 /niKJc ^fta/oa: ra/v/y rtdd/sb or grvemsh sbaMs anddj/fi a-ird smkivia. 



WAiftsandafona: often pyritfc, hrintor fresh watar. 9u/phaTvs Iquv. 



'sfa/iOS and bfursha/ea mi/rimrbn/nfo nf,>fvt n^/t mirn •n tho fn^ 



wmrifwnv rsLisufKfsnyxs. poonuT con^Qff»rure3. sane/y snofss 

 wAefsAo/JOS. and d/urs/ia/es.inudicortxinofe c^/ron atja inica in t/ie fore*- 

 anon: ^e/rvraJ/f aredsha/e of me /op and bottom. 



B/Lf9 aJiQ/e: witbnodufes ofcorOomfi^ of tron espec/affy af/Ae top: 

 JOndsfone. very subord/nata sfrsoMs c/ fine gro/ned /rmestone, 

 espec^//y onffmwesfsidQ. biodc s/to/ss at /ho dose. 



'e soifdafone : brme ami jo/t e 



3/x7/e nro/n/yb/ock orxJ a/ways a/ /he dose, urt/h huge roif/?<f 

 6a//s ofco/c/fe. /owarr^ /he /cp. b/ue ond b/ac/( sha/e^. 



3/vah /mes/onea. do/am/fes and jha/ej: hose ab/ue or /Aick 

 sho/e.- fop ^nera//y /mss/ane and rare/y reak/zsh. 



/jmes/one : buff and //ght b 



', fierce/y effervescent, somtwhgf 



Vhife sandstone wryfxav.pefssing /owords fhe mrffy rnto catoreot/s sarzft*^jes/ax . 



Do/ofn//es:a/jome /eve/s ^andy a/ others oa//f/c. of/en cherty. 

 A//ke Tymoch/ze ondof^er/eye/s jho/y/ anhydr//e o/?u/}dant /rj 

 the /ower parts of the so// basin j Ce/esftte . 



r, cakxj/vous maris: red and p 

 rare/y b/uv ondiihck. sho/es. 



Whife do/om//es : pecu/iar wht/e/fess chorvcter/sffc, ohbn c/ierfy. 

 and ivd/r afiff/e guor/z sarrd ndr/ch somebmes occurs in beds; 

 pi/re f/mea/one rure. 



Reddish //mestones ancfjho/es or /ro/t ore. 



Red s/ia/es, somef/mes sandy or green Jha/es. 



Shff/es, redand b/ue and sandy ; ^adva/ /rant/hon at base. 



r b/ack. ajpec/a?y tou/ards b 



l/mes/cne onddc^omi/9; b/ue ojd ^haj^. or sa/Zd s/raAr 0/ basa. 



Whf/e/nab^ aonds/on t-: or r^resentea Dv rpff rfCfk^ ^I 

 >. y/3'Mt7/ fqp of unefer'/y'tif fonrtafion. . — 



