46 ON THE GEOLOGY AND NATURAL HISTORY 
14. Two or three layers of soft fine-grained sandstone, more or less argillaceous, and separated by seams of 
clay, . : : . ; : i ‘ : ; ‘ : . : see 
15. Bluish and ik tae ts : ‘ ; j meee 2 | 
16. Alternate layers of hard bluish gray spientice = seams of om “— pias concretions, 3 
17. Rather hard yellowish limestone, with Fusulina, . : ; ; . , ; ‘ ‘ wt 2% 
18. Ash-colored clay, not very well exposed, . ; ‘ : . ‘ ‘ , ‘ . . ne 
19. Yellowish impure limestone, with Fusulina,  . ‘ ; . ‘ . : ‘ : F eae 
20. Ash-colored laminated clays—above the creek, . , ‘ ‘ : : . ; . : ae 
About three hundred yards below where this section was taken, the creek was observed 
to fall nearly a foot, over a ledge of hard limestone ; and one mile further down, the bed of 
the creek is composed of a hard yellow limestone, containing great numbers of Fusulina. 
At these localities Mill creek is probably not elevated more than thirty feet above the 
Kansas. 
Near half a mile east or southeast of the point where the Fusulina limestone was seen 
in the bed of Mill creek, and at a somewhat higher elevation, we saw apparently the same 
bed of Fusulina limestone, showing a thickness of three feet. Under this there was at one 
place exposed a thickness of some four or five feet of very fine yellow sandstone with 
minute specks of mica, ‘These exposures indicate a moderate dip of the strata towards 
the west or northwest. 
On the north side of the Kansas, in a direction a little west of north, and about sixteen 
miles from the last-mentioned localities, we observed an outcrop, on a small stream marked 
‘‘ Last creek” on the maps, presenting the following section, descending : 
Feet. 
1. Seams of yellow magnesian limestone, alternating with clay, showing a thickness of about, —. ‘ . oe 
2. Yellow soft granular magnesian limestone, containing Productus Norwoodi, and an undetermined species 
of Myalina, . . . ‘ : ; : ‘ ‘ . ‘ , : ee 
3. Fine laminated black ae ; = S : ‘ a i ; ‘ ae | 
4, Gray rather soft argillaceous limestone, . e248 
5. Blue somewhat indurated very fine calcareous 2, EsGR at its junction vias the next wha bilo Cho- 
netes, Synocladia biserialis, Chetetes, and fragments of Crinoids, . 9 
6. Seams of hard compact gray limestone, alternating with softer iene ne and Jain casts 
of many small Cypricardia-like shells, small Murchisonia, Pleurotomaria, Macrocheilus, Naticopsis, Bel- 
lerophon, &c., * : : ° 2 
7. Bluish laminated clays inlets to ea sie . : 4 
8. Yellow rather soft granular magnesian limestone, with embedded cn of Sola more mak do.,. 5% 
9. Bluish indurated calcareous clays, : . 3 
The base of this section is evidently not elevated much above the Kansas, as it extends 
down to the bottom of a deep ravine formed by the creek, while its top appeared to be 
