CORRELATION OF THE CARBONIFEROUS ROCKS 

 OF NEBRASKA WITH THOSE OF KANSAS 



In the Journal of Geology the writer published in 1897 

 an article on the "Comparison of the Carboniferous and Permian 

 Formations of Nebraska and Kansas " x in which he correlated 

 the formations found in Nemaha, Otoe, and Cass counties of 

 southeastern Nebraska with those of eastern central Kansas. At 

 that time comparatively little work in areal geology had been 

 done in northeastern Kansas, the Cottonwood limestone being 

 the only formation that had been even approximately traced from 

 the Kansas River north to Nebraska. 2 



The correlation of the formations in the above paper was 

 based entirely upon their lithologic, stratigraphic, and faunal 

 characters, for the writer did not have an opportunity to trace 

 the distribution of any of the formations to the north of the 

 Kansas River or to study the geology of the region between 

 that river and Nemaha county, Neb. The rocks to the west of 

 the Missouri River, covering the eastern part of Nemaha, Otoe, 

 and Cass counties, were correlated with the Wabaunsee 3 forma- 



1 Op. cit., Vol. V, No. 1, p. 16, and No. 2, p. 148. 



2 See " A reconnoissance geologic map of Kansas," in the Univ. Geol. Surv. 

 Kans., Vol.1, 1896, PI. XXXI. 



3 Since this article was written a paper has been published by Dr. Charles R. 

 Keyes, in which he substitutes the name " Atchison Shales " for the Wabaunsee for- 

 mation (Am. Geologist, Vol. XXIII, pp. 304,309, 310.) The claim for the priority of 

 Atchison shales rests upon the fact that, in 1873, Professor G. C. Broadhead published, 

 under the general title of " Upper Coal Measures," the following heading for a sec- 

 tion of the Upper Carboniferous rocks : " General vertical section of Upper Coal 

 Measure rocks below the Atchison county group " (Geol. Surv. Mo., Preliminary 

 Rep. Iron ores and coal fields, 1872, Part II, Geol. Northwestern Mo., chap, iv, p. 

 88.) In this chapter there is no description of the "Atchison county group" or 

 further reference to it. Chapter xiv of the report by Professor Broadhead is devoted to 

 a description of the geology of Atchison county" {ibid., pp. 376-388) ; but there is no 

 mention of " Atchison county group " in the entire account, and it is stated under the 

 heading of the " Upper Carboniferous " that " the rocks of this county belong to the 



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