BEEDE: RECONNAISSANCE IN THE BLUE VALLEY. 199 



Section on south side of creek, a quarter of a mile west of the 

 junction, at (larrison : * stratum. Total. 



ft. in. ft. in. 



8. Limestone and flint 2—0 15— 



7. Flint 0-4 12—10 



6. Hard yellowish limestone, weathering to light gray 1—4 12 — 6 



5. Limestone, with four inches of flint above 1 — 1 11 — 2 



4. Clay, parting with warty limestone above 1 — 10 — 1 



3. Limestene, half flint through the middle 1—1 9 — 1 



2. Blue shales 2—0 8- 



1. Limestone 6—0 6— 



Covered from bottom of section to creek bed. 



A portion of the section at Water ville was covered, and it is 

 quite possible that a portion of both top and bottom of the sec- 

 tion was not exposed. Above that section are many feet of 

 clay deposit of recent age, resembling not a little the reddish 

 drift clays of the eastern part of the state. There are also good 

 exposures of the Strong flint east of Irving, where it forms the 

 tops of the steep bluffs on the east side of the Blue river. -J^^ast 

 of Blue Rapids this flint is exposed in the heads of the little 

 creeks. 



The outcrop from the Strong flint to the base of the Florence 

 flint is almost always covered. I know of no locality where the 

 entire strata are exposed. For some distance above the Strong 

 flint are shales and thin limestones, and for about forty feet 

 below the Florence flint are blue, green and olive shales, with a 

 two-foot stratum of limestone. These shales are best exposed 

 at the base of the following section, west of Garrison. 



Florence Flint and Limestone. — These are the most marked 

 and striking deposits in the Blue Valley region. They are al- 

 ways prominent, adding more than any other single group of 

 rocks to the ruggedness of the flint hills. Its forty or fifty feet 

 of flint and limestones underlaid with soft shales make its out- 

 croppings precipitous Avherever they occur. 



Prof. W. C. Knight t has correctly correlated these rocks with 

 those of Wymore, Neb. They are prominent in the bluff's of the 

 Blue river from Wymore to Stockdale, Kan., being interrupted 

 at Blue Rapids by a local fold in the strata. At Oketo it is a lit- 

 tle under 1250 feet A. T.,t and at Garrison it is about 1200 feet 



* Since comparing this section with others of the Florence flint, it seems 

 possible that it may be a dislodged portion of a cliff of the Florence flint, though 

 it appears to be in its natural position. 



t Jour. Geol., VIII, p. 368 (1899). 



X U. S. Topographic Sheets. 



