THE NEBRASKA PERMIAN 365 



The next examination was made at Blue Springs. The bluffs 

 opposite the town are from fifty to ninety feet above the river 

 bed and extend down the stream for two or three miles. The 

 most striking feature of these bluffs is the thick bed of cherty 

 limestone that has not been seen to the northward, but which 

 may yet be found at "The Mounds," or along some of the high- 

 lands away from the river. Below the cherty band alono- the 

 bluffs, the slopes are in many places paved with large blocks of 

 cherty limestone that have been loosened by frost. Above the 

 cherty layer, there are several bands of workable limestone that 

 have been quarried for building purposes. While the Blue 

 Springs exposure is above the Holmesville, it is not definitely 

 known what it rests upon. It is quite possible that there is a 

 series of rocks intervening that have not been discovered. 



BLUE SPRINGS SECTION 



No. IO. Soil - --•-.. 



No. 9. Yellow shelly limestone - 



No. 8. Compact yellowish limestone containing 



vertebrates and many invertebrates 



No. 7. Cherty limestone, fossiliferous - 



No. 6. Yellowish soft limestone 



No. 5. Cherty limestone, fossils in chert 



No. 4. Indurated and variegated marls - 



No. 3. Bluish limestone - 



No. 2. Unexposed ------ 



No. 1. Bluish limestone - 



Total - - - 69% feet 



Ncs. 7 and 8 contain a great many fossils, some of which 

 are new to science. The following were collected : 

 Productus semireticulatus Shum. 

 Meekella striatiocostata Cox. 

 Or this sp. 



Seminula argentea Shep. 

 Aviailopecten occidentalis Shum. 

 Aviculopectcti maccoyi M. and H. 

 Aviailopecten sp. 

 Orbiculoidea sp. 



