riMJAMS.] 



VERNEUIL, OWEN. 



143 



ie Falls of Ohio, with the Goniatite limestone of Rockford, Jackson County, Indiana 

 well as the upper shales of Perry County, Tennessee, are the representatives of the 

 )evouian system of Europe. 



The reviewer further states: "The Knob region, Indiana, Kentucky, 

 'ennessee, Illinois, and Ohio, above the black slate, they show to cor- 

 :espond to the Carboniferous rocks." * 



In 1847, M. de Verneuil called attention to the necessity of changing 

 the limits of the Cliff limestone and Blue limestone of the Ohio reports. 



[e regarded the upper part of the Cliff limestone as equivalent to the 



Devonian system of Europe. He announced (in this paper, 2 for the first 

 ime, I believe), that " le grand 6tage des psammites, situe au-dessous 

 lu gres houiller et du calcaire de montagne, la ou il existe, et que Ton 

 appelait Devouieu, devait etre rang^dans le systeme carbon ifere." 3 



Later in the same year, in his paper entitled " Note sur le paralle- 

 iisuie, etc.," he elaborated the same idea. 4 



In the same year, after a visit to this country, M. Verneuil published 

 lis important paper in the Bulletin of the Societe g^ologique de France, 5 

 >n the parallelism of Paleozoic rocks. This paper is discussed in a pre- 

 r ious chapter (see p. 08). M. de Yerneuil's most important contributions 

 to the correlation of the Mississippian series were his positive recogni- 

 tion of the Waverly group of Ohio as Carboniferous, and his demon- 

 stration that all the formations from the top of the Black shales upward, 

 ind inclusive of the so-called " Carboniferous limestone," for Indiana, 



Kentucky, Tennessee, and the corresponding beds in the Mississippi 



alley, were of Carboniferous age. 



Owen's final report did not appear till 1852, but he presented an ab- 

 stract of its contents before the American Association in 1851. 6 After 

 mtlining the lower and " metalliferous rocks " of these States, he men- 

 :ioned the occurrence in Bed Eiver Valley of a il Magnesian limestone," 

 followed by a calcareous formation which he called " Devonian." This 

 ras traced westward to Iowa City, thence southeast to the Mississippi 

 tiver. Between Johnson and Iowa Counties is found an uplift of " Car- 

 >oniferious sandstone," and " Carboniferious limestone " occurs along 

 the Iowa Eiver, which runs on the extreme eastern margin of the coal 

 ield. From Iowa Eiver the Carboniferous rocks bear south through 



r ashington, Henry, and Lee Counties, crossing the Des Moines Eiver 

 md Iowa into Missouri. 



1 The original article reviewed I have not seen.— H. S. W. 



2 Lettre sur la geologic des Etats-Unis. By M. Ed. de Verneuil. Soc. geol. France, Bull., n, vol. 4, 

 )p. 12, 13, 



3 Page 12. 

 •Pages 646-687. 



6 " Note sur le parallelisnie des roches des depots paleozolques de l'Amerique Septentrionale avec 

 sux de l'Europe, suivi d'un tableau des especes fossiles communes aux deux continents, avec l'indi- 

 ition des etages ou elles se rencontrent et termine par un examen critique de chacune do ces es 

 jeces."— Soc. geol. France, Bull,, II, vol. 4, pp. 646-709. 

 6 Owen, D. D. : Abstract of an introduction to the final report on the Geological Surveys made in 

 r isconsin, Iowa, and Minnesota, in the years 1847-1850, containing a synopsis of the geologic feat- 

 res of the country. Pioc. Amer. Assoc, vol. 5, 1851, pp. 119-131. 



