2 5 8 
The American Geologist. 
October, 1905 
REVIEW OF RECENT GEOLOGICAL 
LITERATURE. 
A preliminary list of mastodon amd mammoth remains in Illinois 
and Iowa. Netta C. Anderson. 
On the proboscidean fossils of the Pleistocene deposits in Illinois 
and Iowa. Johan August Udden. 
(Augustana Library Publications. No. 5. Rock Island,, 111. 
1905.) 
These papers constitute an important addition to the literature 
of Pleistocene geology. Miss Anderson has gathered the data, so 
far as the same can be ascertained, concerning all the known in- 
stances of the discovery of the remains of these extinct animals 
in the states of Illinois and Iowa, culling from geological reports 
.and other publications, and from museums and curators such facts 
.as have not been published. The total number of finds is over 
eighty. Two outline county maps of these states show the geo- 
graphic distribution of these remains, from which it appears that 
the mastodon and mammoth ranged throughout these states. In 
Illinois the localities are rather evenly scattered, but in Iowa they 
are far more numerous in the southeastern part of the state, usually 
prevailing along the main river valleys. In the southwestern part 
of Iowa also is a grouping, suggesting some relation to the great 
valley of the Missouri river. 
These eighty odd finds are discussed by Prof. Udden from four 
points of view, viz: (1) Conditions of interment; (2) Specific de- 
termination; (3) Relation to different drifts; (4) association with 
other fossils. 
In relation to the method and conditions of interment Prof. 
Udden makes the broad statement, "that the greater number of 
the animals whose remains have been discovered perished in low 
and boggy localities, sometimes probably in search for water or 
•salt. These remains have come from stream beds and alluvial de- 
posits, and from terrace and glacial gravels. But most of the fos- 
sils have come from the loess or from near the surface of the 
boulder clay under the loess." Prof. Udden gives the following 
table of conditions of interment: 
£ 
+j 
w 
m m 
SPECIMENS FOUND IN 
r consi 
two or 
arts of 
ton. 
g 0> 3 
v c, <v 
• Q<M "S 
.Q<w 
r* O 0> * 
£°5 
3 in o w 
3 be o> 
Z.S£«s 
ZBt 
Streams or in alluvium. 
Glacial gravels 
Bogs or near springs... 
Loess or on Glacial clays 
