532 IOWA ACADEMY OF SCIENCE Vol. XXV, 1918 



heavily Fusulina bearing. This limestone is the Forbes, which 

 is so prominent at Stennett. The visit here was made in Decem- 

 ber, the river was frozen over, and the weather was extremely 

 cold accompanied by snow squalls which precluded any attempts 

 at fossil collecting. From the Wayne stennett quarry on Pilot 

 creek near Stennett to this outcrop the course of East Nishna- 

 botna river is coincident for five miles with the strike of the 

 Forbes as it dips east on the northwest limb of the Brownville 

 syncline. Two miles north of the Clark mill site outcrop, the 

 Cedar Creek ledge is exposed along the roadside well above the 

 bottom land and less than a mile from the river. This ledge is 

 about twenty feet lower in the general section than the Forbes. 

 In the absence of a topographic map and precise leveling it is 

 estimated the dip on the northwest limb of the Brownville syn- 

 cline is S. 60 degrees E., at the rate of sixty feet to the mile. It 

 is probable the Forbes is present only in a limited outlier west of 

 the river at Stennett and vicinity. There is no e\'idence of a 

 fault near Red Oak, the heavy dip being sufficient in the four 

 miles from the Clark mill to the Keystone mill to bring in the 

 City Bluffs at the latter place. 



The main limestone ledge at Stennett has been regarded as 

 equivalent to the limestone at Forbes, ^Missouri. The ^Missouri 

 Geological Survey, in Volume 13, has correlated the Forbes lime- 

 stone with and adopted the name Deer Creek of Kansas. How- 

 ever, as it is at least fifty miles from the nearest outcrop of the 

 Deer Creek in Missouri to that in Iowa near Corning, where the 

 Stennett main ledge is exposed in the bed of the East Nodaway 

 river this ver^^ wide correlation is subject to much criticism. The 

 Missouri Survey gives the following section for the Deer Creek 

 in that state. 



5 Limestone, gray, cherty, thick or thin bedded 13 to 15 



4. Shale, black and slaty in the middle 5 



3. Limestone, gray, fine grained with specks of calcite. ... 2 



2. Shale 7 



1, Limestone, soft, buff, argillaceous 5 



This does not correspond with any seciuence of strata known 

 in lo'wa. Until the connection between these limestones has been 

 traced in the field it would be more judicious to avoid all corre- 

 lations. The writer has carefully studied the faunal lists given 

 by Girty in the Missouri report referred to and finds the Iowa 

 limestone to be paleontologically allied with the Topeka. Ther-? 



