35 8 W. C. KNIGHT 



Dyas (Permian). Later Professor Geinitz, 1 of Dresden, studied 

 the fossils collected by Professor Marcou, and in an article con- 

 firmed Marcou's classification. The work of Marcou and Geinitz 

 called forth some severe criticism from American geologists, 

 which culminated in Professor Meek's masterly production in the 

 Final Report of the U. S. Geological Survey of Nebraska, in 

 which he proved conclusively that the Missouri River rocks 

 extending from the mouth of the Platte River, southward along 

 the Missouri River in Nebraska, were Coal Measures. The only 

 recent publication bearing on the subject of the Missouri River 

 rocks in Nebraska is an article published by Professor Prosser, 2 

 in which he strongly supports Meek's views. Without question 

 these rocks must be considered Coal Measures. 



Early investigators paid little or no attention to the Pale- 

 ozoic exposures lying some distance west of the Missouri River. 

 While making his reconnaissance for the final report on the 

 geology of Nebraska, Dr. Hayden suggested that the true Per- 

 mian rocks as found in Kansas might occur in some of the 

 southern counties of Nebraska. However, his statements are 

 very confusing and assure one that he had not arrived at any 

 definite conclusion. While suggesting in a footnote 3 that the 

 Kansas rocks might extend northward into Nebraska, on the 

 same page, in discussing the Beatrice section, he says: "Beds 

 i, 2, and 3 of the above section are undoubtedly Permian or 

 Permo-carboniferous, though they contain fossils common in both 



Permian and Carboniferous rocks Bed 4 seems to form 



a sort of a transition bed between Permian and Carboniferous 

 formations. The Permian rocks pass beneath water level at 

 Beatrice westward," etc. The fossils on which the above state- 

 ments in reference to the Beatrice section were made were 

 Syntrilasma (Enteletes) hemiplicata and Pinna peracuta. Dr. Hay- 

 den visited many outcrops within the Permian area in Gage 



1 M. d. K. Leop. Carol. Acad. d. Naturl. Carbonformation und Dyas in Nebraska. 

 Dresden, pp. vii-|-C)i. 5 plates. 



2 Jour. Geol., Vol. V, No. 1, pp. 1-16, and No. 2, pp. 148-172. 



3 U. S. Geol. Surv. of Nebraska, final report, p. 28. 



