NATURAL SCIENCES OF PHILADELPHIA. 17 



Solemya, a Myalina near M. squamosa, Pleurophorous? subcuneata, Bakevellia 

 parva, Pecten undt., and a Euomphalus near E. rugosus ; also, a Spirigera 

 allied to S. subtilita, but more gibbous, Orthisina umbraculum? 0. Shumardi- 

 ana, &c. Locality, summit of the hills, near Fort Riley and above there ; also 

 seen on Cottonwood creek 25 to 3." 



12. Light grayish yellow, rather granular magnesian limestone, con- 

 taining spines and plates of Archaocidaris ; a few fragments of small Crinoid 

 columns, Spirifer similar to S. linealus, but perhaps distinct ; 'also same 

 Spirigera seen in beds above, Orthisina Shumardiana, 0. umbraculum? and Pro- 

 ductus Calhounianus. Forms distinct horizon near summit of hills in vicinity 



of Fort Riley, also seen on Cottonwood creek 7 to 8 



13. Soft argillo-calcareous bed, apparently local. Kansas Falls 5 



14. Light grayish and yellowish magnesian limestone, containing many 

 concretions of flint, also the same Spirigera found in beds above, and Pro- 

 ductus Norwoodi P. Calhounianus, with Discina tenuilineata and an undeter- 

 mined Monotis. Fort Riley and below, also at Kansas Falls and on Cotton- 

 wood creek 38 



15. Alternations, bluish, yellowish and brown clays, with a few thin 

 seams of limestone. Fort Riley, Kansas Falls; also beloiv Fort Riley, and 



on Cottonwood creek 35 



16. Light yellowish magnesian limestone, containing fucoidal markings, 

 fragments of small Crinoid columns, Pecten, Allorisma, Spirigera, Orthisina 

 umbraculum? 0. Shumardiana, Discina tenuilineata, c. Lower quarry at Fort 

 Riley, and at other places above and beloiv Fort R., as well as on Cottonwood 

 creek 4 to 



17. Alternations of blue, red, and light gray clays, with sometimes thin 

 layers and seams of magnesian limestone. Fort Riley 28 



18. Light gray and whitish magnesian limestone, containing Spirigera, 

 Orthisina umbraculum? 0. Shumardiana, Productus Calhounianus, Acantho- 

 ctadia Americana, and undt. sp. Cyathocrinus. Lower part containing many 

 concretions of flint. Fort Riley and on Cottonwood creek. Whole thickness 

 about 40 



19. Brown, green, and very light gray clays, alternating ; contains near 

 the upper part fragments of Crinoid columns, Synocladia biserialis, spirigera, 

 Productus Norwoodi, Chonetes mucronata, Orthisina Shumardiana, Orthisina 

 umbraculum, fix., with teeth of Petalodus Alleghaniensis. Fort Riley 14 



20. Alternations of rather thin layers light yellowish magnesian lime- 

 stone, and various colored clays ; the limestone layers containing 3Ionotis, 

 Synocladia biserialis, <$fc. Locality same as last 33 



21. Slope, no rocks seen. Beloiv Fort Riley 25 



22. Whitish, or very light gray magnesian limestone, rendered porous by 

 cavities left by the weathering out of numerous Fusulina. This is the high- 

 est horizon at which any remains of Fusulina were met with. Some four 

 miles below Fort Riley, along a creek on the south side of the Kansas, and appa- 

 rently not more than ten feet above it 2 



23. Bluish, light gray, and brown clays, with occasional layers of mag- 

 nesian limestone. Chonetes mucronata, Orthisina umbraculum? Monotis, Fu- 

 sulina, Qc. Ten miles beloiv Fort Riley 35 



24 Hard, very light yellowish gray magnesian limestone, with Fusulina, 

 and spines of Archaocidaris. Forms a marked horizon near the same locality 

 as last 6 



25. Slope, with occasional exposures, thin layers of Fusulina, limestone, 

 and seams of gray limestone containing Myalina, Monotis, Pecten and frag- 

 ments of Synocladia biserialis. Near same locality as last 36 



26. Light gray argillaceous limestone, showing on weathered surfaces a 

 somewhat laminated structure; contains large spines of Archaocidaris. Near 

 Ogden Ferry, and Manhattan 9 



27. Gray limestone, often fragmentary, with much clay above ; lower 

 part hard, and more or less cellular in middle. Locality, same as last 5 



1859.] 



