184 
AUG. F. FOERSTE 
As far as known, the overlying strata, forming the upper part 
of the Kimmswick section along Sanders branch, including both 
the Hormotoma (?) major and the Plectamhonites gihhosus zone, 
are not known to occur south of Pike County. Apparently they 
are restricted to areas north of the Cap au Gres fault, and have 
their affinities with the Prosser strata exposed in Minnesota. If 
Plectamhonites gihhosus and Cyclospira hisulcata are to be re- 
garded as characteristic of the lower half of the Fusispira bed 
of Ulrich, then the highest so-called Kimmswick strata exposed 
in Ralls County and in the adjacent parts of Pike County do not 
rise above the Prosser horizons. This view is favored by the 
extreme poverty of Maclurites and Maclurina in the upper strata 
of the so-called Kimmswick in Ralls and Pike Counties. 
Since the McCune exposures belong to the Hormotoma (?) 
major zone, beneath the Plectamhonites gihhosus horizon, it ap- 
pears necessary to correlate the McCune limestone also with the 
Prosser of the Minnesota section, at least for the present. When 
a better knowledge of the fauna of the McCune limestone has 
been secured it may be necessary to alter this correlation. 
On the other hand, the lower Kimmswick fauna, containing 
Comarocystites and Echinosphaerites, is unknown in Ralls and 
Pike Counties, in the northeastern part of Missouri. Until this 
lower Kimmswick fauna is known in greater detail, it must be 
regarded as practically an uncertain quantity in Champlainian 
stratigraphy. At present it is assumed to belong below any strata 
exposed at the locality south of Thebes, Illinois. 
12. THE FAUNA OF THE PLATTIN LIMESTONE IN RALLS COUNTY, 
MISSOURI 
No fauna has been listed so far from the typical Plattin limestone 
of southeastern Missouri. In the northeastern part of Missouri, 
in Ralls County, only those fossils have been studied which occur 
in the upper part of the Plattin limestone as there exposed, usually 
within 10 feet of the top of the formation. On comparing the 
fauna from the top of the Plattin limestone in Ralls County 
with that of the Auburn chert in Lincoln County, enough differ- 
