516 TRANS. OF THE ACAD. OF SCIENCE. 



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and the Coal Measures, some 563 feet, are called Lower Per- 

 mian in my section. Messrs. Meek and Hayden call them 

 " Permo-Carboniferous." I think them related to both the 

 Permian and Coal-Measures, but more to the Permian. They 

 think them related to both the Permian and Coal Measures, 

 but more to the Coal Measures. Our only difference, then, 

 is as to the degree of relationship which these rocks bear to 

 the Permian and Coal Measures.* 



My principal reason for calling these rocks Permian is, that 

 they contain many more Permian than Carboniferous fos- 

 sils, while Messrs. Meek and Haydenf declare the prepon- 

 derance is in favor of Carboniferous fossils. J 



5th. Dr. Hayden, by Mr. Meek's notes, spends great learn- 

 ing in a criticism on my list of Lower Permian fossils, pub- 

 lished ten years since. He well knew that all my materials 

 for the papers published in 1858 were collected by Maj. 

 Hawn, under such circumstances as would preclude absolute 

 accuracy. § Still, it is a fact that all the materials collected 

 since by Messrs. Meek and Hayden and Maj. Hawn and my- 

 self have not materially changed the principal divisions of 

 the section then published by Maj. Hawn in our joint paper, 

 on the Permian. The progress of a single season compelled 

 Messrs. Meek and Hayden to make more changes in their 

 Nebraska section than the progress of the last ten years has 

 made in Maj. Hawn's. It was a matter of surprise to me to 

 find the rocks so accurately represented in the main features 

 of his section. 



* This is the extent of my sinning.* Rather small to call for such an 

 article as Dr. Hayden's. 



t Messrs. Meek and Hayden claim deference to their opinions, because 

 they examined these beds so carefully for several weeks on and near the 

 junction. But aided by Maj. Hawn, I spent two seasons on and near the 

 junction of these rocks, and have lived seventeen- years on the rocks 

 forming a part of this section. 



J This is a simple difference of opinion. And to test the matter, since 

 Dr. Hayden is so very positive in his assertions, I make two propositions, 

 and pledge myself to make them good. I will find two Permian species 

 in these rocks to every Carboniferous one Messrs. Meek and Hayden will 

 find, and I will produce more Carboniferous fossils from a single foot of 

 rocks, just below my line of division, than Messrs. Meek and Hayden can 

 from all the 700 feet of rocks above it, and I will set my labor against 

 both of theirs, and only occupy the same time they do jointly. 



§ Proc. Acad. Sci. St. Louis, vol. 1, p. 175, note. 



* I cannot close this part of the subject without making my acknowledgments to Dr. 

 Ilayden for writing a letter to a prominent official in Kansas, detailing this, my error, 

 and hence my unfitness to discharge the duties of State Geologist. It was understood 

 that this letter was designed for publication. The merits of this act of labor with the 

 civil authorities of Kansas is made still more manifest in view of tho fact that ihe decision 

 of this matter either way would make no difference in the economical Geology of Kansas. 

 The rocks would hare the same properties and value whether Dr. Hayden's views or mine 

 are correct. There was, then, no necessity for this letter, and it must have been a pure 

 labor of love. 



