l6-2 KANSAS rXIVF.RSlTV i^fUARTERIA'. 



(S. Sacharoidal sandstone, lo feet. 



g. Surface of river. 



The strata at this point dip gradually toward the west, and the 

 sandstone mentioned as No. 4 disappears about three hundred 

 yards east of the town. This marks the uppermost part of the 

 Hamilton at this place. One of the peculiarities found in this sec- 

 tion is the Turbiform fossil mentioned in No. 5. The limestone in 

 which it was found is very hard, and consequently, it was difficult 

 to extract a fossil as large as this, so that its S3'stematic charac- 

 ters could be accurately determined. It was referred bv Prof. 

 Broadhead to the genus Turbo, and b\- another paleontolgist to 

 Pleurotomaria. It seems to be peculiar to this localit\-, though 

 not abundant. The same horizon was subsequently examined in 

 Callaway count}- without finding other traces of it. 



The Hamilton limestone lies above the first magnesian limestone, 

 No. 7, with only five feet of sandstone and chert intervening which 

 must I'epresent a long interval of time. 



The following groups of the Missouri section are not represented 



here. 



^^ • \ Corniferous. 



Devonian. ^ it u 1 



/ Lower Helderberg. 



TT ci • \ Niagara. 



Upper Silurian, ^j j o- 



'^ ' I Hudson River. 



T C--I ■ \ Trenton. 



Lower Silurian. ,>i 1 r, • 



/ Black Kiver. 



It seems that after the first magnesian limestone was deposited 

 there was a slight upheaval, the limestone remaining above the sur- 

 face of the Paleozoic ocean until the latter part of the Hamilton, 

 when it was submerged and received the remaining part or the sed- 

 iments of this group. Even in Callaway county, thirt)- miles dis- 

 tant, the thickness is much greater, including the Hamilton shales, 

 which art' there well developed and showdng their characteristic 

 fossils. 



fust undernrath the magnesian limestone the sacharoidal sand- 

 stone is found. There are but fen feet of this exposed above the 

 surface of the river, and this for only about fifty 3'ards; it projects 

 outwards from the bluff and presents the evenlv rounded surface 

 characteristic of this sandstone where weathered. We were not able 

 to determine the cause of the sudden appearance and disappearance 

 of it. The character of the surrounding strata would not warrant 

 the inference that it was a local upthrust. More proloably it repre- 

 sents a small island. We were unable to examine the opposite 

 side of the river for its occurrence there. 



I am indebted to Prof. Broadhead for kind assistance in the 

 development of the section above given. 



