Welter — Kind&rhook Faunal Studies. 59 



6. Light gray oolitic limestone with uniform lithological 

 characters. 2 to 4 feet in thickness. 



5. Fine grained yellowish sandstone much like parts of No. 



1, often crowded with casts of fossil shells. Maximum 

 thickness 7 feet. 



4. Dark gray compact limestone, sometimes slightly 



arenaceous. It breaks up into small fragments upon 

 exposure, and is very fragmentary even when not 

 exposed to the atmosphere. Maximum thickness 12 

 feet. 



3. Band of oolitic limestone about 3 inches in thickness. 



2. Band of compact limestone everywhere crowded with 



Chonetes. 6 inches in thickness. 



1. Fine grained sandy shales, varying from bluish clay 



shale to fine grained yellow sandstone. The upper 

 portion of the bed quite fossiliferous. Greatest thick- 

 ness actually exposed above river level 82 feet, its total 

 thickness as estimated from well borings 140 to 200 

 feet. 



In his report on Des Moines County in 1895, Keyes * gives 

 the following section of the Kinderhook beds at Prospect 

 Hill, a bluff on the river bank just south of the city of 

 Burlington. 



Feet. 



6. Limestone, buff, soft, sandy locally 5 



5. Limestone, white, oolitic 3 



4. Sandstone, yellowish, soft, fine-grained, highly 



charged with casts of fossils 6 



3. Limestone, argillaceous, fine grained, with often 



an oolitic band or thin bed of impure limerock 



at base 18 



2. Sandstone, yellowish, soft, friable, clayey 25 



1. Shale, blue, argillaceous, shown by borings to ex- 

 tend 100 feet or more below river level ( exposed ) 60 



* Geol. Surv. Iowa. 3 : 433. (Des Moines, 1895.) 



