94: The Anierican Geologist. August, less 
ill criuoidal life. The rocks cannot be divided into the three 
divisions lithologically as at the typical locality, and the only 
way the' horizon of the different localities can be determined is by 
the comparison of the species of crinoids and their exact position 
in the strata, with species at the typical locality or with other 
localities whose horizon has V)een referred to the typical locality 
with absolute certainty. 
The rocks of the different horizons in the county always occur 
in the following- order: 
d Argillaceous sandstone, 
c Blue shale, 
b Encrinital limestone. 
a Blue shale 
The lowest or riierty bed outcrops {fa Raccoon creek two miles 
southwest of New Roso. where the upper limestone (see section 
given under a. Cherty Beds) disintegrates in places, weathering 
out many crinoid remains, the types being characteristic of the 
Lower Keokuk; several specimens of Alhiprosaf-ocruntx, which is 
characteristic of the Upper Keokuk, have been found at this 
locality as well as other localities that are equivalents of the 
lower beds. Bearing in mind that the rocks of this group in this 
county were deposited and elevated at irregular intervals, the 
next series of rocks in ascending order outcrops on the south 
branch of Walnut Fork four miles east of Crawfordsville, (see 
section under b Keokuk limestone). 
The limestone resembles very much that at Keokuk, Iowa; it is 
composed of enormous crinoid stems attaining a diameter of one 
inch and a length of several feet, associated with large specimens 
of Archiinedrs owritaita Hall, Product ks laagtiii.s M. & W. P. 
puiictdtus 8o\verl)y, Platyccras rqMiIaferd ITall, P. iiifiiiidiliiiJidit 
M. & W. 
In the shale was found a small nest of crinoids containing a 
large Bori/criim.s gouldl Hall, and a very large Parj/crinus proba- 
bly a new species. 
Again in ascending order the next series of rocks are those out- 
cropping on Indian creek about four miles above the mouth, 
where is exposed in the bottom of the stream blue -shale, under- 
laid by encrinital limestone; the shale containing large nests of 
crinoids, several si)ecies being identical with those found at Can- 
ton, Ind. , which is regarded as the Geode Bed. A-tuiocrhius 
