Charles Whittlesey.— A. Winchell. 265 
lakes Erie and Michigan. 3. From Chicago west to the sum- 
mit between lake Michigan and the Mississippi. 4. From 
Sheboygan, Wisconsin, to lake Winnebago. 5. From LaPointe, 
lake Superior, to the Apuknoyekan river. 6. From the west 
end of lake Superior up the valley of the St. Louis river, across 
the Mesabi range to the Grand Fourche of Rainy Lake river. 
7. A sheet of detailed sections showing the interchangeability 
and contemporaneous character of the red and blue clays at 
Racine, Milwaukee and Sault Ste. Marie. The explanation of 
these sections tended to show that in aU parts of the north- 
west, east of the Mississippi, the same order of succession in 
the drift deposits obtains. Colonel Whittlesey had sought 
everywhere for organic remains, and he presented a few, 
referred as usual, to their precise localities, depths and sur- 
roundings, which awakened a lively discussion. He felt him- 
self justified in conclusion, in pronouncing "all this vast, wide- 
spread, superficial mass, extending from the interior of Ohio 
to the plains of the Red river of the North and the Saskatche- 
wan, one formation, with members;" and "its difference of 
composition — its clays, marls, hard-pans, gravel, bowlder- 
masses and sand ridges — due to modifications of that force, 
whatever it was, which brought on the materials, and in doing 
so, scratched, polished and abraded the surface of the under- 
lying indurated rocks." 
His study of the geology of Ohio was not restricted to one 
or two features. On several occasion, he treated of the general 
geology of the state ; but more frequently, he described more 
limited regions or features/ Many of his reports on the 
* General Geology of Ohio, with a map. 1847. (Pamphlet). Outline 
sketch on the geology of Ohio, with outline map of the geological for- 
mations of Ohio, pp. 13. (Howe's Historical Collections of Ohio, 
1848). Geological map of Ohio, 2x2 feet, J. H. Colton & Co., New 
York, 1856. The equivalency of the rocks of nortlieastern Ohio and 
the Portage, Chemung and Hamilton rocks of New York, pp. 16. 
(Proc. A. A. A. 8., Cincinnati, 1851). The lower Limestone Group 
Coal Series of Eastern Ohio, pp. 8. (Proc. Inst Mining Eng. 1864). 
Physical Geologv of northeastern Ohio, 4to. pp. 9. Plate and elegant 
map. (Proc. Bo's. Soc. Nat. Hist., Feb. 2, 1869). Physical structure 
of the Ohio coal field, pp. 7,1887. (Proc. Amer. A.A. Sci., 1875). 
Great Coal Seam region of Ohio, pp. 7, Hlus., 1877. Iron ores of the 
Great Coal Seam region, plates, pp. 4, 1877. Dip of the Gn?at Coal 
Seam, Ohio. pp. 4, 1878. Geology of Portage county, Ohio, 1878. 
General geology of the counties of Columbiana, Stark and Tuscarawas. 
Large, 8vo. pp.8. (Report of Secretary of State, Ohio, 1878.) Great 
Coal Seam, Straitsville, Ohio. pp. 6. Map. 1881. 
