274 C. R. KEYES — DEVONIAN INTERVAL IN MISSOURI 



shale bed which has been called the Hannibal may or may not be the 

 stratigraphic extension of the typical Hannibal of the northeast part of 

 the state, but it probably is. For the present it may be best to adopt 

 Weller's name, Northview shale, for this formation in southwest Mis- 

 souri.* The so-called Louisiana limestone of southwest Missouri is cer- 

 tainly not a part of the Louisiana limestone of the typical locality. The 

 " Louisiana " limestone, the Phelps sandstone, the Sac limestone, and 

 the King limestone, of Greene county, will doubtless be found to be 

 parts of one terrane, as Wellerf has suggested. While it is no doubt 

 true that the faunal evidence of Shepard's differentiation and classifica- 

 tion of these beds is very slender, it is also true that for reasons elsewhere 

 stated the criticism of this author's correlations by means of the fossils 

 rests on foundations almost as uncertain. 



The so called Eureka shale and all of the section given, up to the 

 base of the Burlington limestone, Weller places in the Kinderhook. 



ARKANSAS SECTION 



According to Professor Williams's recently published account of the 

 succession of faunas in northern Arkansas,! the following grouping of 

 strata between the Ordovician and the Boone chert (Burlington lime- 

 stone) is presented : 



Northern Arkansas Succession 



Feet 



Saint Joe marble 50 



Eureka shale (typical) 30 



Sylamore sandstone 40 



Eureka shale (in part) and green shales 50 



Saint Clair limestone (Niagara) 155 



The Saint Joe limestone is regarded by the author mentioned as equiv- 

 alent to part of the Burlington limestone of the more northern sections. 

 The evidence gathered from the Missouri investigations indicates rather 

 that it represents the Chouteau. He considers the typical Eureka shale 

 as forming the base of the Carboniferous. The Sylamore sandstone and 

 the shales immediately associated underneath are placed in the Devonian. 



Nature of Kinderhook Formation and Chouteau Fauna 



general statement 



On account of its lying on the border zone of the Devonian and the 

 Carboniferous, the Kinderhook formation has a special interest in the 



* Trans. St. Louis Acad. Sci., vol. ix, 1900, p. 9. 



f Journal Geology, vol. ix, 1901, p. 134. 



X Arkansas Geol. Survey, Ann. Rep., 1892, vol. v, 1900, p. 277. 



