Nebraska Tertiary.—Russell, Vio 
outcrops occurring in the counties of Sherman, Howard, Greeley 
and Valley. Two of these Tertiary exposures have been pre- 
viously cited viz: at Scotia and Seneca, in Hooker Co. I will 
give two more, one at Brewster, one at Rockville. With the ex- 
ception of the last the masses rise in isolated buttes from 65 to 
100 feet. Rockville exposes only a few feet. 
In composition there is but little difference. Seneca, Scotia 
and Brewster almost the same; Rockville slightly more siliceous. 
Among the observed fossils Planorbis, Physa, Limnwa, Viviparus 
identifiable. Also many fragments that cannot be recognized 
even generically. The Seneca outcrop alone has furnished verte- 
brate remains. 
Passing upward to the superimposed and unconformable sands, 
clays, gravels and loessian we find these clearly differentiable 
into two divisions. The sands, clays and gravels comprise 
the beds to be inserted between the other known terms. The 
best locations for examination and study are along lines of 
the Burlington and Missouri River railroad in the aforementioned 
counties. The extremes of variation are a pronounced ferrugin- 
ous arenaceous mass and a drabbish argillaceous soil. The typi- 
cal component is an iron stained clay. The ferrugineity is often 
manifested in small iron concretions and in hand specimens of 
iron-cemented sand. Not infrequently do these hand specimens 
show the presence of manganese. This particularly from a 
deposit south from Arcadia in Valley Co. Digestion with hot 
hydro-chloric acid demonstrates protoxide of iron as an external 
granular deposit on much of the sand. After such treatment the 
dark grains came out surprisingly white and clear, 
Contrasting the individual particles of this formation with the 
superior and non-conformable loessian distinct differences obtain, 
In the lower material the percentum above .028 mm.is much greater, 
The grains do not show such marks of attrition. The percent of 
water-worn particles is somewhat high but even here the original 
angular faces have not been removed. Of the particles, most are 
quartz, but identifiable I find muscovite, biotite, hornblende and 
glauconite the most common. Of hand specimens syenite, quartz- 
ite, chert, quartz and granite. The last however of very limited 
occurrence, 
As far as observed this horizon is destitute of fossils. Hence 
present examination must proceed without these valuable indices. 
