Keokuk Group^ ^lississlj^j^lVaUei/. — Beachler. 95 
lovoci Hall, one of the most common species at Indian creek is 
found in numbers geodized at Canton. Several species have 
been found at Indian creek that are identical with those of Bono, 
Laurence Co. , Ind. , which also is equivalent of the Geode Bed. 
Tracing the Indian creek layers northwest seven miles they are 
found outcropping in the northeast part of Park county on Sugar 
creek where, together with the higher members of the sub-Car- 
boniferous, they are dovetailed into the Coal Measures. 
From the above facts we may consider the Indian creek locality 
as equivalent to the "Geode Bed." Having established the hori- 
zon of the above localities which until 1889 were unknown as 
prolific crinoid localities, the most difficult question remains to 
be decided, i. e. the determination of the "Crawfordsville beds;"' 
these beds heretofore have been regarded as Lower Keokuk as 
some of the crinoids resemble Burlington forms. 
In excavating at these beds in 1888 this fact was observed that 
the prevailing types of crinoids found ranging from the level of 
Sugar creek upward ten feet were the genera Cyathocrinus, Poterio- 
cri?iMs and Bari/crinus ] while above these occur the genera Ony- 
chocrinus, Forheswcrinus, GUhertsocrinus and Platycrinus; in 
Washington county these latter genera of crinoids are found over- 
lying the "Geode Bed" and are identical with those from upper 
layers at the "Crawfordsville beds. " 
One mile below the Crawfordsville beds may be seen a heavy 
layer of limestone containing large geodes about the size of a 
man's head, and overlying is the equivalent of the "Crawfords- 
ville beds," but diminished to a thickness of only a few feet. 
At Scott's Eagle Mills, in the northeast part of Park county, the 
writer has lately traced the Crawfordsville beds as overlying the 
Indian Creek beds. Poter*iocrinus I'eaches its climax in size in 
the Crawfordsville beds, while the species of Barycrinus resem- 
ble very closely, if not identical with, the large species found on 
Walnut Fork. 
AUoprosaUocriniis, an upper Keokuk species is also found at 
these beds. 
It will be seen by close study of the rocks on Sugar creek that 
the "Crawfordsville beds" occupy a position between the "Geode 
Bed" and the Magnesian limestone. 
Paleontology. 
In the study of the life fauna, especially the crinoidea, of the 
