1 6 CHARLES S. PROSSER 



Nebraska City, and some apparently higher beds below there on 

 the Missouri, may possibly belong to the horizon of an inter- 

 mediate series between the Permian and Carboniferous, for which, 

 in Kansas, Dr. Hayden and the writer proposed the name Permo- 



Carboniferous It is true that in first announcing the 



existence of Permian rocks in Kansas, we also, upon the evidence 

 of a few fossils from near Otoe and Nebraska cities, resembling 

 Permian forms, referred these beds to the Permian ; but on after- 

 wards finding that these fossils are there directly associated 

 with a great preponderance of unquestionable Carboniferous 

 species ; and that there is also in Kansas a considerable thick- 

 ness of rocks between the Permian and Upper Coal Measures 

 containing, along with comparatively few Permian types, numer- 

 ous unmistakable Carboniferous forms, we abandoned the idea 

 of including these Otoe and Nebraska City beds in the Permian. 

 And all subsequent investigations have but served to convince 

 us of the accuracy of the latter conclusion."^ 



It is to be noted in reference to this correlation of the Upper 

 Palaeozoic rocks of Nebraska with the Upper Coal Measures, that 

 Meek did not intend to include the rocks in Kansas which he 

 and Hayden had called Permian,^ a fact which has been misap- 

 prehended by certain writers on the geology of this region. 

 Since the report of Meek and Hayden, no contribution of 

 importance has appeared relating to the geology of the Upper 

 Palaeozoic of Nebraska, consequently it is especially interesting 

 to compare their conclusions with our present knowledge which 

 has been enriched by the labors of the last quarter of a century. 



Charles S. Prosser. 



'Fin. Rep. U. S. Geol. Sur. Nebraska, etc., pp. 130, 131. 



= Trans. Albany Inst., Vol. IV, 1858, p. 76; Proc. Acad. Sci. Phil., Vol. XI, 1859, 

 pp. 20, 21 ; and Am. Jour. Sci., 2d ser., Vol. XLIV, 1867, p. 37. 



(To be continued.) 



