KeoltiiJi (rroiij)^ MlsK/sslppl Valley. — Beachler. 1)3 
ranging from the size of a, Avalnut to two feet in diameter, and 
cavities are usually filled with zinc blende, calcareous spar, etc. 
In Illinois the rocks have been recognized at Warsaw above the 
steamboat landing, on the branches of Otter creek, at Whitehall, 
Greene county, and on Little Sandy, Scott county. 
The great number of geodes lithologically characterizes this 
bed everywhere, in southern Indiana near Bono, Lawrence county, 
at Canton, Washington county, as well as in the top of the hills 
in Brown county, this bed may be seen, and the geodes line the 
sides of the roads. The rocks along Indian creek in southern 
part of Montgomery county are the exact equivalent of the Can- 
ton beds as they contain the same fossils but no geodes. 
The writer has also been unable to distinguish this bed in Ken- 
tucky. 
d. Tlie Magnesian^ 
or Second Archimedes limestone of Owen and the Warsaw of Hall, 
succeeds the • 'Geode Bed ;" and to this succeed beds of shaly lime- 
stone, with partings of shale or marl rapidly disintegrating upon 
exposure; thickness forty feet. The section is seen above and 
below Keokuk, Iowa, but much better developed on the opposite 
side at Warsaw, Illinois. Tracing the formation north it appears 
at Mount Pleasant. 
In Missouri the rocks of this age are seen resting upon the 
Keokuk limestone proper at Boonville. In Indiana it occurs at 
Bloomington and Spurgeon Hill, as well as on Clear creek. Mon- 
roe county. In Kentucky it outcrops south of Glasgow and at 
Oil City, Barren county. 
On the rel.\tion of the Crawpordsville. Inihana beds 
with the typical locality*. 
The Keokuk rocks form the sui'face of the whole of Mont- 
gomery county, with the exception of a narrow strip of later rocks 
extending into the western part, and are deeply covered with 
drift so that the only exposures are along the water-courses. 
The lamination is regular and generallj^ thin, and the general dip 
is toward the southwest. 
The rocks seem to have been deposited and elevated at irregu- 
lar intervals, giving the same section, but a remarkable difference 
*Extract read before the Indiana Academy of Science, December 30, 
1891. 
