Hlliamb.1 THE FIRST MISSOURI REPORT. 147 



Foot. 



C Upper Coal series 275 



Coal Measures, e 1 M iddle ( !oa 1 .scries 225 



( Lower Coal series 140 



System III. Carboniferous { rf. Ferruginous sandstone.... 195 



Carboniferous o r ?" ?*" Louis limestone 200 



Mountain limestone | *• Archimedes limestone.... 200 



{i. Encnmtal limestone 500 



f f j. Chouteau limestone 70 



Chemung J k ' Vermicular sandstone and 



SystemlV. Devonian... J |, T .^ ales - •----• 75 



^ I. Lithographic limestone .. 60 



p. Hamilton group 50 



m. Onondaga limestone 75 



The Coal Measures is overlaid by d, Drift, and the Onondaga lime- 

 stone is underlaid by Delthyris shaly limestone. The term " Ferruginous 

 sandstone " appears to have been first applied here in a technical sense 

 and defined by Prof. Swallow 1 and first applied to the rocks in the bluff 

 near Salt Creek, Sulphur Springs, near Osceola. St. Louis limestone 

 had been used as a general term, and was technically applied by Dr. Owen 

 as a discovery of Dr. Shumard in 1849. Archimedes limestone had been 

 used already by Dr. D. D. Owen in 1852. The name Encrinital lime- 

 stone was also suggested by Owen in 1852, who spoke of the Encrinital 

 group of Hannibal, Missouri, which was also Swallow's typical locality. 2 

 Prof. Swallow applied the name "Chemung" to the group of strata 

 including the Chouteau limestone, Vermicular sandstone and shales, 

 and Lithographic limestone. It is placed stratigraphically at the base 

 of the Carboniferous system. In a foot-note he says : 3 



There is some difference of opinion respecting the system to which this group be- 

 longs, but if we make a division of the Missouri rocks into Devonian and Carbonif- 

 erous, the line of separation most distinctly marked is between the Encrinital and 

 Chouteau limestones. 



Six pages later a new section begins with the following: 



System IV, Devonian. — Two formations of this system exist iu Missouri: Hamilton 

 group, Onondaga limestone. 



Mr. Meek stated in his report that the stratigraphical position of j, &, 

 and I, " taken in connection with their organic remains, leaves little 

 room to doubt that they represent the Chemung group of New York," 

 and "I am far from considering it a settled question that we should not 

 carry up the Devonian so as to take in the Chouteau limestone." 4 



As well as the fact can be determined by the literature, Prof. Swal- 

 low was the first to correlate these rocks with the Chemung group of 

 New York. The rocks themselves had been included in the Carbonif- 

 erous by Owen in 1852, under the name "Argillo-calcareons group of 

 Evans Falls." Neither Messrs. Swallow nor Meek was fully satisfied in 

 placing them in the Devonian. But it was James Hall who settled the 

 correlation by identifying Owen's u Argillaceous group" of Iowa with the 

 Chemung (Devonian) of New York, and recognized the same formation 

 in the section at Hannibal, Mo. This was in harmony with his correla- 



1 Owen's Report, pt. 1, pp. 91, 92. 3 Ibid. pt. 1, p. 101. 8 Ibid., pt. 1, p. 101. 4 Ibid., pt. 2, p. 103. 



