OF THE UPPER MISSOURI. 
51 
Feet.- 
12. Light grayish yellow, rather granular magnesian limestone, containing spines and plates of Archseoci- 
dctrts ; a few fragments of small Crinoid columns, Spirifer similar to S. lineatus, but perhaps distinct; 
also same Spirigera seen in beds above, OrtMsina Shumardiana, O. umbraculum ? and Productus 
Calhounianus. Forms distinct horizon near summit of hills in vicinity of Fort Riley, also seen on 
Cottonwood creelc, . . . . . . ... . . . . . . . 7 to 8 
18. 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 Productus Norwoodi, P. Calhounianus, with Piscina tenuilineata 
and an undetermined Monotis. Fort Riley and below, also at Kansas falls and on Cottonwood creelc, . 38 
15. Alternations, bluish, yellowish and brown clays, with a few thin seams of limestone. Fort Riley, Kan¬ 
sas falls ; also below Fort Riley, and on Cottonwood creelc, ........ 35 
16. Light yellowish magnesian limestone, containing Fucoidal markings, fragments of small Crinoid columns, 
Pecten, Allorisma, Spirigera, Orthisina umbraculum?, 0. Shumardiana, Piscina tenuilineata, &c. 
Lower quarry at Fort Riley, and at other places above and below Fort Riley, as well as on Cottonwood 
creelc, ................. 4 to 
17. Alternations of blue, red, and light gray clays, with sometimes thin layers and seams of magnesian lime¬ 
stone. Fort Riley, ............... 28 
18. Light gray and whitish magnesian limestone, containing Spirigera, Orthisina umbraculum ?, 0. Shu¬ 
mardiana, Productus Calhounianus, Acanthocladia Americana, and undt. sp. Cyathocrinus. Lower 
part containing many concretions of flint. Fort Riley and on Cottonwood creelc. 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 Shu¬ 
mardiana, Orthisina umbraculum, &c., with teeth of Petalodus Alleglianiensis. Fort Riley, . . 14 
20. Alternations of rather thin layers of light yellowish magnesian limestone, and various colored clays; the 
limestone layers containing Monotis, Synocladia biserialis, &e. Locality same as last, . . .33 
21. Slope, no rocks seen. Below 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 highest horizon at which any remains of Fusulina were met with. 
Some four miles below Fort Riley, along a creelc on the south side of the Kansas, and apparently not 
more than ten feet above it, .............. 2 
23. Bluish, light gray, and brown clays, with occasional layers of magnesian limestone. Chonetes mucro¬ 
nata, Orthisina umbraculum ?, Monotis, Fusulina, &c. Ten miles below Fort Riley, . . .35 
24. Hard, very light yellowish gray magnesian limestone, with Fusulina, and spines of Archceocidaris. 
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 contain¬ 
ing Myalina, Monotis, Pecten, and fragments of Synocladia biserialis. Near same locality as last, . 36 
26. Light gray argillaceous limestone, showing on weathered surfaces a somewhat laminated structure; con¬ 
tains large spines of Archceocidaris. 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 
28. Whitish clays and claystones, with a thin layer of hard compact gray limestone near the middle. Lo¬ 
cality same as last, ............... 10 
29. Light greenish indurated clays. Same locality, .......... 3 
