Carboniferous formations in different parts oft 



[Thickness given in fee 



Sys- 

 tem. 



i 

 I 

 I 





Se- 

 ries. 



a> 



el 



.a 



.a 



Appalachian region (fo- 

 lios of Greol. Atlas 

 U. S.). 



Monongahela formation. 



Conomaiigh formation. 



Allegheny formation: 



Upper Kittanniiig 

 coal. 



Brook villa coal. 



Pottsville group: 



Mississippi Valley east of Ozark 

 uplift (Purdue, A. H., Wins- 

 low folio (No. 154), Geol. Atlas 

 U. S., 1907). 



Pottsville formation. 



Chester group : 



Kaskaskia group: 



Birds ville formation. 



Tribune limestone. 



Cypress sandstone. 



Ste. Genevieve limestone. 

 Meramec group: 



St. Louis limestone. 



Spergen limestone. 



Warsaw limestone. 

 Osage group: 



Keokuk limestone. 



Burlington limestone. 

 Kinderhook formation. 



Northwestern Arkansas (Sim- 

 onds, F. W., and Branner, 

 J. C, Rept. Geol. Survey 

 Arkansas, 1888, vol. 4, 1891, 

 p. xiii). 



Millstone grit. 



Keasler limestone. 

 Coal-liearing shale. 

 Pentremital limestone . 

 Washington shale and sand- 

 stone. 



South end of Ozark uplift. 



Adams, G. 1., and Ulrich, E. 0., 

 Fayettevillo folio (No. 119\ 

 Geol. Atlas U. S., 1905. 



Archimedes limestone. 

 Marshall shale. 

 Batesville sandstone. 

 Fayetteville shale. 



Wyman sandstone. 



Boone chert and limestone. 



Eureka shale. 



Feet. 

 Winslow formation 100+ 



Morrow formation 200 ± 



Kessler limestone lentil. 

 Brentwood limestone lentil. 



Unconformity 



Pitkin limestone 0-15 



Fayetteville formation 20-350 



Wedington sandstone meml)er. 



Batesville sandstone 0-90 



Unconformity 



Boone formation 325± 



St. Joe limestone member. 



Chattanootra formation 20-145 



Purdue, A. H., Winslow folio (No. 154), 

 Geol. Atlas U. S., 1907. 



Feet. 

 Winslow formation 2, 300 



o P^ 



So' 



Bloyd shale 100-220 



Kessler limestone lentil. 

 Brentwood limestone lentil. 



Hale formation 100-200 



Taff, J. A., Tahlequah folio (No. 

 122), Geol. Atlas U. S., 1905. 



Pitkin limestone 10-40 



Fayetteville shale 150-300 



Wedington sandstone member. 



[Lacking.] 



Unconformity 



Boone limestone 100-f 



[Not exposed. 



Feet. 

 Winslow formation 900 ± 



Unconformity 



Morrow formation 80-210 



Hale sandstone lentil. 



Unconformity (7) 



Pitkin limestone 3-80 



Fayetteville formation 20-160 



Wedington sandstone member. 



[Lacking.] 



Unconformity 



Boone formation 100-375 



Unconformity (?) 



Chattanooga formation 0-40 



Taff, J. A., Muscogee folio (No. 

 132), Geol. Atlas U. S., 1906. 



Boggy formation. 



Feet. 

 500 -f 



Winslow formation 800-1,000 



-Unconformity- 



Morrow formation 100-120 



Unconformity 



Pitkin limestone 60 ± 



Fayetteville formation 20-60 



[Lacking.] 



Boone formation 200 -f 



Arkansas coal field. 



Winslow, A., quoted by Steven- 

 son, J. J., Trans. New York 

 Acad. Sci., vol. 15, 1896, p. 51. 



Feet. 



Poteau stage 3,500-3,900 



Sebastian stage: 



Green woodsandstone. . .. 100 



Tomlinson shale 500-600 



Hartwell sandstone 0-100 



Belva shale 0-500 



Ozark sandstone 0-500 



Spadra stage 0-500 



Norristown stage 100-400 



Booneville stage 400-2,500 



Appleton stage: 



Cross Plains sandstone 50-150 

 Russell ville shales . . . 500-600 

 Washburn sandstone. 500-600 



Danville stage. 



48011°— 12. (To face page 458.) No. 2 



Note. — The heavy black line indicates boundary between Pennaylvan 



