Conglomerates of Sauk County, Wisconsin. 97 
Orthis Barabuensis Hall, Delphinocephalus Minnesotensis Owen, 
&c. I have examined a collection of these fossils from the 
above locality in the possession of Dr. Lapham of Milwaukee, 
and have seen the fossils and quartzite pebbles in the same 
fragments side by side. 
Il. The observations on the North Range were made about 
the Lower Narrows of the Baraboo river and westward 
from there about half a mile. This north range seems to be 
less continuous both as to elevation and as to the character of 
its rock material. I am told by Dr. Lapham that it seems 
rather to be made up of detached masses of metamorphic rocks. 
The rising ground, however, never entirely disappears, and the 
-ngiaans seems to be found as far to the east and west as in 
the south range. At the Baraboo Narrows the metamorphic 
rocks are in great force, the cliffs on either side the river, which 
here makes a direct cut through the range from south to north, 
being as much as four hundred feet in height. The body of 
the bluff on the west side is made up of heavy beds of quartzite, 
with, in places, intercalated beds of a metamorphic conglomerate, 
and of a talcose schist like that in the south range. These bedsall 
stand at a very high angle, between 75°-80° from the horizontal, 
the dip being north with possibly a slight inclination to the 
east. At the bottom of the hill on the south side is an ex- 
posure of a peculiar light-colored siliceous schist, entirely dif- 
ferent from any of the other rocks of the series. old sha 
sunk some thirty feet on the schist, affords most excellent op- 
portunity for examination. The total thickness seen was about 
schist, I found a horizontal undisturbed sandstone, laid open 
for some distance by quarrying. The beds are generally a foot 
Am. Jour. Sc1.—Turrp Series, Vor. III, No. 14.—Fss., 1872. 
7 
