38 C. S. PROSSER — PERMO- CARBONIFEROUS AND PERMIAN ROCKS. 



yellowish gray magnesian limestone, with Fasulina and spines of Archseo- 

 cidaris,^^ 6 feet in thickness, and forming a marked horizon about 10 

 miles below Fort Riley* The sum of the thickness of all the beds below 

 the Manhattan stone down to the level of the Kansas river at Manhattan 

 accordino; to their section is 242 feet, which, from the position of the 

 limestone on Blue mount and from the determination of its elevation by 

 an exact survey, we know to be overestimated about 40 feet. It is true 

 that Meek and Hayden did not report this stratum at Manhattan, but 

 stated that it formed a marked horizon 10 miles below Fort Riley. The 

 present highway from Manhattan to Fort Riley crosses such a ledge four 

 miles southwest of the city, on the bluff east of Eureka lake, and 10 miles 

 from Fort Riley. This is undoubtedly the horizon noted by Meek and 

 Hayden, and there is no question but that it is the Manhattan stone, for 

 the stratum may be readily traced from the hills about Manhattan to this 

 locality. The Manhattan stone is probably bed number 1 of Broadhead's 

 section at Manhattan, which he gave as 4J feet thick.f 



" Fasulina Limestone^^ of Swallow. — This stratum forms bed number 80 

 of Swallow's section, which he named the Fusulina limestone, a " buff, 

 porous and magnesian " limestone 6 feet thick, exposed at Manhattan, 

 Cottonwood Falls and Mill creek. It is important in reference to the 

 locality to observe that Professor Swallow noted the occurrence of this 

 limestone not only in the Kansas valley, but in the Cottonwood valley at 

 Cottonwood Falls. 



Fauna of the Shales above the Manhattan Stone. — Immediately above the 

 Manhattan stone are yellowish shales containing abundant fossils. From 

 several exposures of these shales about Manhattan, particularly on mount 

 Prospect; in the Uhlrich Brothers' quarry, 2^ miles southwest of Man- 

 hattan; and farther west, by the side of the Manhattan and Ogden road, 

 on the hill between Wild Cat creek and Eureka lake, the following species 

 were obtained : 



1. Chonetes granulifera, Owen, {aa) 



2. Athyris subtilita (Hall), Newb. (c) 



3. Produdus semireticulatus (Martin), de Koninck. (c) 



4. Berbya crassa (M. and H.), H. and C. (c) 



Also some large forms like D. keokuk (Hall), H. and C, and D. rohiisia 

 • (Hall), H. and C. 



5. Fasulina cylindrica, Fischer, (c) 



6. Synodadia Userialis, Swallow, (c) 



7. Ehombopora lepidodendroides, Meek, (c) 



8. Archxocidaris, spines and plates, (c) 



9. Straparollas {Euomphalus) subrugosus, M. and W. (r) 



* Proe Acad. Nat. Sei., Phila., vol. xi, p. 17. 



t Trans. St. Louis Acad. Sci., vol. iv, pt. iii, p 491. 



