146 



THE DEVONIAN AND CARBONIFEROUS. 



IBULL. 80. 



Upper series. < 



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The following generalized section of the *• Sabcarboniferous lime- 

 stones of Iowa n appears in this report. 1 



Feet. 

 /'. Upper concretionary limestone 25 



e' . Gritstones — contains Lepidodendra, Calamites, etc 5 



d'. Lower concretionary limestone — Lithostrontian, etc., com- 

 pact white, usually concretionary, magnesian in places, in 

 eluding the more evenly bedded limestones of St. Louis, 



with Melonites, etc 30 



cf. Gritstone 10 



b'. Magnesian limestone— reticulate corals and Terebratula 



Boy88ii 10 



a'. Geodiferous bed 30 



/. Archimedes limestone, a thin bedded, light gray limestone — 



Spirifers, Terebratula lioyssii, Orthis, etc 50 



e. Shell beds— gray crystalline limestone, Spirifer striatus, 

 cu8pidatus, rotundus, Productus punctatus, and semireticu- 



latu8, etc 15 



d. Keokuk cherty limestone 15 



c. Reddish brown Encrinilal group of Hannibal, Mo., alter- 

 nating with bands of chert, at base white, crystalline, 

 Lower series. { and semi-oolitic — Productus cora, Spirifer cuspidatus, etc. 70 

 b. Encrinital group of Burlington, top brown and flesh 

 colored encrinital limestone, with Pentremites and Crin- 

 oids, various beds of limestone, argillaceous and magne- 

 sian 60 



a. Argillo-calcareous group, Evans's Falls, at the top a fine- 

 grained buff siliceous rock, containing casts of Chonetes, 

 Posidonomya, Allorisma, Spirifer, and Phillipsia ; Middle, 

 ash-colored, earthy marlites '. 70 



The author described under the name a Cedar River limestone forma- 

 tion * the limestones of Red Cedar and Iowa River Valleys, Iowa, and 

 referred them to the Devonian age. 2 



On the map the legend classifies this " formation of Cedar Valley" 

 as follows : 



Hamilton and Onondaga limestone. 



( a. 



Upper Coralloid limestone. 

 Middle shell beds. 

 Lower Coralline beds. 



The author recorded no evidence of the Black shale in the States 

 reported upon. 



In the fall of 1855 G. C. Swallow, as State Geologist, published the 

 u first and second annual reports of the Geological Survey of Missouri." 

 The first annual report was made in 1853, but was merely a short report 

 of progress. 



In the Survey work, F. Hawn, G. C. Pratt, G. C. Broadhead, B. F. 

 Shumard, and F. B. Meek assisted. Dr. Litton furnished a chemical 

 report on some of the principal mines. The maps and charts were 

 drawn by R. B. Price. Messrs. Meek, Hawn, aud Shumard each fur- 

 nished reports on the special work assigned him, and the classification 

 in the main report is in some cases at least suggested by the studies of 

 these assistants. In the generalized section, opposite page 60, the fol- 

 lowing classification of the Upper Paleozoic is given : 



1 Report of a geological survey of Wisconsin, Iowa, and Minnesota, and incidentally of a portion of 

 Nebraska and Tennessee, by D. D. OweD, United States geologist. 

 8 Ibid., p. 77. 



