. The fluorspar deposits of southern Illinois . uthern Illinois. System. Quaternary Tertiary Carboniferous Formation. Lafayette (?) Character. Loess loam. Gravels. Mansfield Sandstone and conglomerate. Birdsville Sandstone, shale, and thin limestones. Tribune Limestones. Cypress Heavy-bedded sandstone. Ste. Genevieve St. Louis Tullahoma Devonian Ohio Oolitic and and limestone. Black shale. DESCRIPTION OF SEDIMENTARY ROCKS. OHIO SHALE. Character.—T\\Q Ohio shale as developed in this area is a black,fissile shale or slate. It splits in very t
. The fluorspar deposits of southern Illinois . uthern Illinois. System. Quaternary Tertiary Carboniferous Formation. Lafayette (?) Character. Loess loam. Gravels. Mansfield Sandstone and conglomerate. Birdsville Sandstone, shale, and thin limestones. Tribune Limestones. Cypress Heavy-bedded sandstone. Ste. Genevieve St. Louis Tullahoma Devonian Ohio Oolitic and and limestone. Black shale. DESCRIPTION OF SEDIMENTARY ROCKS. OHIO SHALE. Character.—T\\Q Ohio shale as developed in this area is a black,fissile shale or slate. It splits in very thin sheets parallel to theoriginal bedding and is very uniform in character. The only excep-tion to this statement is that at the top a thin bed was observed whichMr. Ulrich considers the equivalent of a similar bed forming the topof the formation in middle Tennessee. In it there are small, rounded <•? Geo). IlUnois. vol. 1, pp. 76-83, 348-^95. Geologic Atlas U. S., folio 95, IT. S. Geol. Survey, 1903, p. 2. U. S. GEOLOGICAL SURVEY 19. BULLETIN NO. 255 PL. II 8 E
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