152 CHARLES S. PROSSER 



The rocks are well exposed nearly to the level of the railroad, 

 which is about 140 feet higher than the Missouri River at 

 Nebraska City, and above it is a section fifty feet in thickness. 

 The base of this section must be considerably higher than the 

 top of the one at Nebraska City unless there be a reversal in the 

 direction of the dip from that noted there. 



SECTION OF THE m'cARTNEY QUARRY. 



Ft. In. Ft. In. 



II. Soil ---..---•. 4 = 56 



10. Yellow, very fossiliferous shales. Spirifer cameratus, 



etc. I = 52 



9. Slightly reddish shales - - - - - - i q = 51 



8. Yellowish shales with thin, greenish-gray layers of rather 

 hard limestone which contain abundant specimens of 

 Myalina perattemiata 2i.nd Pleurophorus occidentalis. A 

 little black shale - - - - - - -63 = 49 5 



7. Yellowish, rather soft limestone containing fossils. The 

 quarry stone i foot 2 inches thick 



6. Yellowish and drab to greenish argillaceous shale 



5. Red argillaceous shale ----- 

 Drab to bluish very soft argillaceous shales 

 Yellowish and rather coarse shales - . . 



Shaly yellowish limestones - - - - 



Yellowish to drab shales for the upper part ; below are 

 reddish shales and the base is covered - - - 13 — 13 



(Railroad level about 140 feet above Missouri River at Nebraska City, or 

 approximately 1050 A. T.) 



No. 7 of the above section is a rather soft limestone aver- 

 aging a little more than one foot in thickness which is used to 

 some extent for foundation and abutment work. This lime- 

 stone contains some fossils, mostly large Lamellibranchs, as 

 for example : 



Myalina subqiiadrata Shum. 

 Allorisma subcuneatum M. & H. 

 Aviculopecten occideiitalis (Shum.) M. & W. 



The greenish gray slightly arenaceous iTrtiestones of No. 8 

 contain abundant specimens of two specimens of Lamelli- 

 branchs. The species collected are : 



