38 The Aim riant Geologist. .ian.i89i 
tain, some thirty miles northeast of St. Elias. and apparently only 
second to it in hight, was named in honor of Sir William Logan, 
formerly director of the geological survey of Canada. Several 
lofty spires, to the east of Mt. Logan, were named after the 
vessels of the Navy and the Revenue Marine that have become cel- 
ebrated for their voyages in Behring sea and the. Arctic ocean. 
"The results of the expedition will be presented to the National 
Geographic Society, and. as soon after as practicable, will be 
published by the society in the National Geographic Magazine." 
PRELIMINARY NOTES ON THE GEOLOGY OF 
CENTRAL NEBRASKA. 
Francis W. Russell, Lincoln. 
It was the writer's pleasure in 1S88, to make a trip to the head 
waters of the Middle and North Loup rivers in Nebraska. Much 
of the country adjacent to these rivers being geological terra in- 
cognita, it was with no little feeling of animation that the investi- 
gation was begun. Previous, careful explorations along these 
streams had distinctly located the "Loup Fork beds, "but it seems 
that study has not been directed to any later formations that 
might possibly exist. 
The researches of Cope, Marsh and Leidy have shown that the 
Tertiary lakes in Nebraska were frequented by great herds of 
mammals, that gave a truly oriental aspect to the region. The 
existence of Miocene or Pliocene strata along these streams is a 
well established fact. Let us consider what may be the age of 
certain later beds as they are found in Sherman county, Nebraska. 
The solution of the problem in this county will serve as a key for 
the entire state. 
The beds here lie along the Middle Loup river. In the first 
place a gnat similarity of appearance will be noted. Over a 
large area there is great homogeneity in composition. By virtue of 
the marked resemblance in appearance these beds might appropri- 
ately be called Loessian or Loess-like. At sight one can hardly 
distinguish between them and the typical Loess of eastern Nebraska. 
Chemical analysis, however, beaker elutriation and the use of the 
microscope reveal sonic important differences. 
The deposit itself is huffish varying to drabbish. Occasionally 
there will lie a small area having a yellowish cast. The appear- 
