14 CHARLES S. PROSSER 



in the vicinity of Nebraska City and referred them to the Upper 

 Dyas or Permian.^ 



The following year Meek criticised the correlations of this 

 paper, stating that "all the rocks seen by Mr. Marcou on the 

 Missouri, from St. Joseph to the Cretaceous above Bellevere, 

 belong to one unbroken series of Upper Coal Measures, as was 

 first shown by Professor Swallow ; with possibly the exception of 

 some of the highest outcrops near Nebraska City, where there is 

 a downward undulation, that may have left portions of the Per- 

 mian on the high parts of the country." ^ 



In ] 866 Geinitz described the fossils collected by Marcou in 

 Nebraska together with some from the Permian of Kansas, 3 and 

 also concluded that the rocks in the vicinity of Nebraska City 

 belonged to the Dyas.'^ 



Meek in 1867, reviewing at length Professor Geinitz's work, 

 failed to agree with him in many instances concerning the 

 identity of Nebraska species with those of Europe ;5 he also 

 reaffirmed his previous statement that the Nebraska City rocks 

 with possibly the exception of the highest beds, belonged in the 

 Upper Coal Measures.^ 



' Bull. Soc. Geol. Fiance, 2.^ ser. Jan. 1864, Vol. XXI, pp. 134-137. Marcou's con- 

 clusion, based on the fossils he collected being expressed as follows : " Les fossiles 

 que j'ai trouves dans cette section [Nebraska City] m'ont rappele tout a fait le faune 

 dj'asique du Zechstein de la Saxe, et je regarde ces couches de Nebraska-City comme 

 appartenant et repr^sentant en Amerique la partie superieure du dyas d'Europe," p. 137. 



^ Am. Jour. Sci., 2d ser., Vol. XXXIX., March 1865, p. 165. 



3M. d. K. Leop. -Carol. Akad. d. Naturl. — Carbonformationund Dyas in Nebraska. 

 Dresden, pp. vii-l-91. 5 plates. 



'' Ibid., p. 89, where he says : " Die bei Nebraska-City vorkommenden Versteine- 

 rungen gehoren einer Zone an, welche den untersten bis mittelren Schichten der 

 deutschen Zechsteinformation (oberen Dyas) entspricht." 



s Am. Jour. Sci., 2d ser., Vol. XLIV, Sept. 1867, pp. 170-188 ; Nov., pp. 327-340. 



^Meek's statement was as follows : Those [rocks] by both of them [Marcou and 

 Geinitz] referred to the Upper Dyas at Wyoming and Bennett's Mill and Nebraska 

 City, y^i'Cci possibly the exception of divisions C and D [the higher beds] at the latter 

 place, belong to the horizon of the Upper Coal Measures. The only point in regard 

 to which there can be any reasonable doubt is, whether the divisions C and D at 

 Nebraska City belong more properly to the horizon of the rocks Dr. Hayden and I 

 termed Permo-Carboniferous in Kansas, or to the Coal Measures proper." {Ibid., pp. 

 336-337.) 



