prosser's section. 33 



Keservoir level : 



Feot. Feet. 



6. Covered sIojk^ on Blue mount. At this horizon yellow shales contain- 10 = 215 

 ing plenty of fossils are exposed on mount Prospect, in tlie Uhlrich 

 quarries up Wild Cat creek and at numerous other places about 

 ^lanhattan. 



5. Manhattan stone— a light yellowish gray, massive limestone contain- 5 = 205 

 ing a considerable amount of chert, and in the upper part great 

 numbers of FtisiiHtHi ci/Hndric(i, Fischer. In the quarr}-- at the top of 

 mount Prospect it is 5 feet 4 inches in thickness. 



4. Covered slope. On mount Prospect are shales, with some beds of 40 — 200 

 laminated limestones about a foot in thickness. 



3. At the top a drab to bluish limestone of irregular texture wliich 64 = 160 

 weathers very unevenly. This layer is between 2^ and 3 feet in 

 thickness on mount Prospect. On Blue mount it forms the first 

 marked ridge, and the slope below the outcrop of this ledge is cov- 

 ered to tlie to}) of the road cut. 



2. Yellowish, bluish and blackish shales, with thin layers of argillaceous 64 ^= 96 

 limestone (0 inches to 1 foot in thickness). The limestone in the 

 cut near railroad level is somewhat bluish and contains fossils. 

 The blackish shales near the top of the railroad cut at its southern 

 end contain numerous fossils. 



I. Covered slope to level of Big Blue river 32 = 32 



COMPARISON OF FA UNAS. 



Fauna at Foot of Blue Mount. — The railroad cut, especially the blackish 

 and yellowish shales in its upper part, afforded the following species: 



1. Productus corn, d'Orbigny.* («) 



This species is quite common in the yellowish shales. 



2. Product us longispinus, Sowerb3\ (c) 



3. Productus nebrascensls, Owen, (r) 



4. Productus semireticulatus (Martin) de Koninck. {rr) 



5. Spirifer cameratus, Morton, (c) 



6. Spirifer {}fartiniu) ptanoconvexus, Shumard. (aa) 



This is a common species of the yellowish shales. 



7. RlninchoneUa uta (Marcou), Meek, (c) 



8. ILisfedia uiorraonii (Marcou), Hall and Clarke. f (u) 



9. Ath^ris suf}titita {lla\\),^e\yh. (c) 

 10. Chonetes^ grauulifera, Owen, (c) 



II. Cliomit'8 glabra, Gem'itz. (rr) 



12. Discina manhnttancmis, M. and II. (rr) 



This species is not figured, but the specimen agrees with ^leek and Ilay- 

 den's description, and the original specimens came from the vicinity of this 

 I horizon at Manhattan. 



♦The relative ahundHnce of the sp'^cies is indicated in the following manner: a= abundant; 

 aa = very aJmndant ; c = common ; r = rare ; rr — very rare, but one or two specimens found. 



tThe genoric name Hustedin has recently been proposed by Hall and Clarke for the shell called 

 Betzia mormonii (Marcou), Meek and IIayd«n (Pal. N. Y., vol. viii, pt. 2, fascicle i, July, 1893, p. 120). 



