XVl ILLUSTRATIONS. 
Hie. 19'—Sectionion! beaver River, Minn =~ -22o-. -2---c coon nsesenence as saeelanma eee neers 
Fic. 20.—Sketch-map of exposures, Minnesota coast, Sec. 32, T. 56, R. 7 Ww. Bear O dane aeenadsto 
Fic. 21.—Section of wall DE of Fig. 20.-....-.--- BE BOO Sa iSO eo BEB Ben a OCSmed Cana nSe= 
Pie. 22,—Rlowagestracture in felsite/=.2. . css se= seer ee smal eee =e eee See eee 
Fie. 23.—Sketch-map of rock exposures in the vicinity of Great Palisades and Baptism River, 
Minnesota Coast). = olan eee epee ae eee aera eee 
Fic. 24.—Section on south cliff of the Great Palisades, Minnesota coast .--.-..----.---------- 
Fig. 25.—Dike in quartz-porphyry, Red Rock Bay. .-....-.-.---.---..--. ---------------------- 
Fic. 26.—Profile of island at mouth of Two Islands River. -......----.---------------------- 
EIG:27-—Sechion on LRemiperancey elven ese ese at ale eee ate eae alee ee 
Fic. 28.—Section on Minnesota coast, near empceance IREVien (sis sae s2 reo t een eee teeiaee 
Fic. 29.—Section on Minnesota coast, near Baptism River - ..-. --....-.-----.-.--------------- 
Fig. 30.—Showing relation of the Eastern Sandstone and Keweenawan melaphyr, Béte Grise 
Bay. Length of section, about 150 feet .....-.......-....---------.------------- 
K1G. 31.—Section on the Hungarian River, Keweenaw Point --...--.----.---..----.---------- 
Fic. 32.—Section showing relation of Eastern Sandstone to Keweenawan diabase, T. 50, R. 29 
Nop GH AS BS oe oricod Spe oenoections HeSond GsEpseesbess costes seDeod Sead soase 
Fig. 33.—Bed of intrusive diabase in Seer slates, Pigeon Bay, Canada. -.....-.--.-....... 
Fic. 34.—Generalized section, showing hypothetical relation of the Animikie Group to the 
Vermillion Lake schiste=- <= 0- <2 -<-5-(- oe coe ae on clone eer eaenie ae Sesreneleee tea 
Fic. 35.—Outline geological map of the Nipigon Lake region, after a manuscript by R. Bell -. 
Fic. 36.—Hypothetical section of Lake Superior Basin ..--....---..----.---. ---------------- 
. 37.—Cross-sections of gorge of Black River, Douglas County, Wis .-....---..---- ------ 
