A. WincheU on the Animike in Minnesota. 19 
above the water-level in two or three places, and at 1362, they 
come within seven feet of contact with the vertical slates,^ 
Subsequently, I made with my brother, a traverse from an- 
other point of the shore. Halt 1297, due north for over a mile, 
along a line previously measured by surveyors employed by 
Sedgwick & Brotherton of Chicago. The gabbro at this 
point, comes down to the shore, but Animike slates are seen 
rising from beneath it at the distance of a third of a mile ( 1418). 
At half a mile inland, vertical slates are found rising in a hill 
slope. These are lithologically identical with those at 1353, and 
lie in their strike at the point of disappearance near 1355. A 
few rods beyond, across the strike, the slates become a porphy- 
ritic, sericitic argillyte, weathering much like the porphyritic 
porodyte of Vermilion lake,^ but with feldspar individvxals along 
w^ith the quartzitic. Still beyond, the porphj^ritic slate becomes 
interbanded with thin layers of uralitic hornblende schist — five 
hundred alternations of which I estimated in the space of three 
rods. This condition is soon succeeded by well established 
uralitic hornblende schist, in a belt eighteen rods wide. This 
if much contorted, showing proximity to the ancient seat of 
some powerful dynamic action. The next ridge has the weath- 
ered aspect of syenite, and consists of quartz, white orthoclase 
and uralitic hornblende, aggregated in a gneissic condition. 
Well characterized Saganaga gneiss is reached at the distance of 
a mile and a quarter from the lake shore. Fuller details of the 
interesting lithological transitions observed will be given here- 
after. The stratigraphical relations noticed on this trip are il- 
lustrated in the subjoined figure. 
Another traverse was made by Mr. Stacy from near Halt 1355? 
a mile west from the last mentioned. The vertical schists were 
found to continue from the shore for a distance of three quar 
ters of a mile, when the usual transition to micaceous strata oc 
curred, and at a mile from the lake, gneiss Avas fully established. 
Not far beyond this, the .rock seemed to be well marked syenite 
1 These observations were made in August, 1887. As no record had 
been published of any observed superposition of Animike on the Ver- 
milion slates, I forvs^arded an announcement to the American Journal 
OF Science, which appeared in the October nvimber. 
' See the fifteenth Ann. Rep. Geol. Surv. Minn. p. 20, etc. 
