10 CHARLES S. PROSSER 



quite deeply covered by drift and loess. On this high country 

 seven and one-fourth miles west and one mile north of Auburn 

 is a Burlington and Missouri River R. R. cut of ten feet which 

 only shows the recent deposits, so that it would appear to be a 

 difficult undertaking to find the bed rock on the uplands. This 

 difficulty was experienced by Dr. Hayden who stated that : 

 " From Tecumseh [the county seat of Johnson county, twenty- 

 two miles west of Auburn] to the source of the Nemaha, about 

 forty-five miles, I did not discover a single exposure of rock, and 

 I could not ascertain that any had ever been observed by the 

 settlers." ^ 



From the facts stated above it seems reasonably certain that 

 the massive limestone west of Auburn may be correlated with 

 the Cottonwood limestone of Kansas. Lack of time prevented 

 the actual tracing of this limestone south to the exposures of 

 Cottonwood limestone in northern Kansas, yet its biologic and 

 lithologic characters are so similar to those of the Kansas 

 stone that it appears quite certain they belong to the same for- 

 mation. In Kansas, the Cottonwood limestone is reported by 

 Professor Knerr in the northeastern part of Marshall county 

 where he states that it " disappears under the drift about five miles 

 north of Beattie in Marshall county."- This locality is about 

 fifty miles southwest of the Nemaha county quarry of Cotton- 

 wood limestone in Nebraska. 



JOHNSON AND GAGE COUNTIES. 



Wabaimsee formation. — Johnson county lies directly west of 

 Nemaha county to the west of which is Gage county which 

 extends south to the state line and is crossed by the Big Blue 

 River. At Tecumseh in Johnson county about fifteen miles west 

 of the Nemaha county quarry and from lOO to 200 feet lower, as 

 far as I can judge from the data at hand. Dr. Hayden reported a 



'Fin. Rep. U. S. Geol. Sur. Nebraska, p. 34. 



"^ Univ. Geol. Sur. Kansas, Vol. I, 1896, p. 142. Also see "A Geologic Map of 

 Kansas (preliminary)," PL XXXI, in the above work on which the line of outcrop of the 

 Cottonwood limestone is represented. 



