46 C. S. PROSSER — PERMO-CAKBOXIFEROUS AND PERMIAN ROCKS. 



bluish limestones. A part of these shales and limestones are quite fos- 

 siliferous, although less strikingly so than the yellowish shale immedi- 

 ately on top of the Manhattan stone. 



LAMELLIBRANCH FA UNA ABOVE THE MANHATTAN STONE. 



About 45 feet above the top of the Manhattan stone is a shaly, fossil- 

 iferous limestone which contains numerous specimens of lamellibranchs ; 

 above it are usually some 20 feet of bluish and chocolate shales suc- 

 ceeded by a limestone containing lamellibranchs ; then about 10 feet of 

 bluish and yellowish shales or shaly limestone capped by another thin, 

 fossiliferous limestone. This series of shales and limestones containing 

 the lamellibranch fauna is about 36 feet in thickness and is apparently 

 continuous and characteristic of this horizon. The lowest shaly lime- 

 stone is probably bed 76 of Swallow's section, which he characterized as 

 a '' soft blue and gray coraline limestone, 3 feet " on Cottonwood and 

 Clarks creek.* In Swallow's section this bed is given as 49 feet above 

 the .top of the Manhattan stone and the following fossils are mentioned : 



^'Monotis lialli and americana [Swallow had stated that this species was the Monotis 

 haivni of Meek and Hayden (Trans. Acad. Sci. St. Louis, vol. i, no. 2, 1858, p. 186, 

 foot-note), which later was changed generically to Pseudomonotis], Productus nor- 

 ivoodl, Synodadia biserialis, Thamniscus dubius (?), Edmondla hardni, Phillipsia clif- 

 tonensis,'' etcetera. 



The higher limestones of this horizon are probably respectively num- 

 ber 68 of Swallow, which was described as a '' hard blue and buff mag- 

 nesian limestone, containing numerous Permian Acephala,^^ and number 

 66, a " light buff and drab argillo, magnesian limestone," containing 

 ^^ Monotis and Bakevellia.^'f This fauna was noticed by the writer at 

 numerous localities in the Cottonwood valley, and the largest collection 

 of fossils was obtained at Matfield Green, where there is a good exposure 

 on the bank of the South fork of Cottonwood river. The following spe- 

 cies were obtained : 



1. Pleuropliorus subcostatus, Meek and Worthen. (a) 



2. Productus nebrascensis, Owen, (a) 



3. Aviculopeden ocddentalis (Shum.), Meek and Worthen. (a) 



4. Pseudomonotis haivni, M. and H. (c) 



5. Pseudomonotis hmvni (M. and H.), var. ovata, M. and H. (c) 



6. Bellerophon cf. sublsevis, Hall, or carbonarius, Cox. (a) 



7. Small Gasteropod, cf. Adis sp. (c) 



8. Myalina (?) swallovi, McChesney. (c) 



9. Edmondia cf. nebrascensis (Geinitz), Meek, (r) 



* Prelim. Rept. Geol. Surv. Kansas, p. 15. The Clarks creek mentioned frequently in Swallow's 

 section is supposed to be the creels entering the Kansas river from the south nearly opposite the 

 eastern line of the Fort Riley Military Reservation. 



fOp. cit., p. 15. 



