ABSTRACTS OF PAPERS 99 



entirely that such teeth occur also in Carboniferous beds in England. Scotland. 

 Russia, and America. Granting that some of the Chattanoogan conodonts are 

 not readily distinguishable from the late Devonian species, it is nevertheless 

 true that on the whole these two microfaunas are far from identical. On the 

 contrary, it is chiefly among the Mississippian conodonts of Europe and Amer- 

 ica that the middle and lower Chattanoogan species find their closest allies. 

 11. Though the general aspect of some of the American faunas of early 

 Mississippian age, especially those in which the pelecypods and corals pre- 

 dominate, like the Conewangs ("Bradfordian") of New York and Pennsyl- 

 vania, the Bedford of Ohio, the Ridgetop of Tenne.ssee. the Chonopectus sand- 

 stone of Iowa, and the Chouteau of Missouri, is decidedly Devonian, the fact 

 that these Devonian reminders are holdovers, in every instance sufficiently 

 modified to be distinguished, must not be ignored. Except the strange types 

 which .subsequently invaded from other faunal realms, the Devonian faunas 

 which entered the North American continental basins from the Atlantic and 

 Gulf of Mexico are but earlier developmental fades of the Mississippian 

 faunas of the same basins. Naturally, then, the Devonian characteristics are 

 still obviously displayed in these near descendants. But it is the new things, 

 like Prodnctus, which have never been seen in standardized pre-Mississippian 

 formations, that tell the truth unmi.stakably. As such unquestioned Missis- 

 sippian types are found in the iMississippi Valley beneath, in, and between 

 each and every one of the pseudo-Devonian faunas mentioned, the a.ssignment 

 of the whole of the Kinderhookian beds in the Mississippi Valley seems fully 

 warranted. Granting this proposition, the case may be said to be established 

 no less firmly with respect to the Chattanoogan series by the physical and 

 faunal relations shown to exist l)etween the latter and the Kinderhookian. 



Eead ill full from manuscript. 



The section adjonrned ai 5 o'clock p. m. 



TITLE.S AXn A15STKACTS OF PAPERS PRESENTED BEFOKK TIU: I'lrTRD SECTION 



AND DISCUSSIONS TIT KR RON 



The Third Section met at 2.40 o'clock p. in., with Vico-l'irsiilciii II. I'.. 

 raltnii ill tho cliaii' ami E. O. Ilovey actiiifi" as secretary. 



(liar, IS 01' Till': ii;<tN oh'Fft iv kiiwna. swF;nr::v 



BY RECil.XALU A. DAI.Y 



{Abst7-act) 



Field data collected in the snninxM- of 1014 suggest that tho Kiruiia ores, 

 forming probably the largest higli-grade iron-oro bodies now being worked in 

 any country, arc difrerciitiatos ;';( situ from a m.ignia. most of which has solidi- 

 fied as fhe adjacent (luarfz jiorpliyry. Tliat kcratophx ric porphyry, like the 

 o|(](«i- syenite porphyry of the district, is believed to 1k' of intrusive origin. Tho 

 two iK)rphyries togetiier ai)pear to represent a fine example of a coinposito 

 (double) laccolith, injected info a (Iiir-k. chiefly volc-inlc series of ho<ldod rocks. 



VIII — Bdll. Geol, Soc. Am., Vol,. J*i, 1014 



