74 ILLINOIS STATE GEOLOGICAL SURVEY CIRCULAR 480 



SCHOPP, J. M., 1938d, Spores from the Herrin (No. 6) Coal bed in Illinois: Illinois (P,s) 

 Geol. Survey Rept. Inv. 50, 73 p. 



SCHOPF, J. M., 1939, Medullosa distelica , a new species of the Anglica group of (P,b) 

 Medullosa: Am. Jour. Botany, v. 26, no. 4, p. 196-207. 



SCHOPP, J. M., 194- la, Adolf Carl Noe: Chronica Botanica, v. 6, no. 10, p. 236-237. 



SCHOPP, J. M. , 194 lb, Contribution to Pennsylvanian paleobotany; Mazocarpon oedip- (P,b,s) 

 ternum sp. nov., and sigillarian relationships: Illinois Geol. Survey 

 Rept. Inv. 75, 53 p. 



SCHOPP, J. M. , 194lc, Contribution to Pennsylvanian paleobotany — notes on the Lepido- (P,b,s) 

 carpaceae: Am. Midland Naturalist, v. 25, no. 3, p. 548-563; Illinois 

 Geol. Survey Circ. 73, 17 P. 



SCHOPP, J. M., 1943, The embryology of Larix : Illinois Biol. Mon. , v. 19, no. 4, 

 Univ. Illinois Press, Urbana, 97 P« 



SCHOPP, J. M., 1948a, Pteridosperm male fructifications — American species of Doler- (P,b,s,c) 

 otheca , with notes regarding certain allied forms: Jour. Paleontology, 

 v. 22, no. 6, p. 681-724; 1949, Illinois Geol. Survey Rept. Inv. 142, 44 p. 



SCHOPP, J. M., 1948b, Variable coalification. The processes involved in coal forma- 

 tion: Econ. Geol., v. 43, p. 207-225. 



SCHOPF, J. M. , 1950, Age of American coal-ball plants: Bot. Gazette, v. Ill, no. 3, (P,b) 

 p. 356-357. 



SCHOPF, J. M., 1956, Petrologic methods for application to solid fuels of the future: 

 Mining Eng., v. 8, no. 6, p. 629-639; AIME Trans., v. 205, p. 629-639. 



SCHOPF, J. M., L. R. WILSON, and RAY BENTALL, 1944, An annotated synopsis of (P,s) 



Paleozoic fossil spores and the definition of generic groups: Illi- 

 nois Geol. Survey Rept. Inv. 91, 74 p. 



SELLARDS, E. H. , 1902a, On the fertile fronds of Cross otheca and Myri otheca , and (P,c,s) 

 on the spores of other Carboniferous ferns, from Mazon Creek, Illinois: 

 Am. Jour. Sci., ser. 4, v. 14, no. 8l, art. 22, p. 195-202. 



SELLARDS, E. H. , 1902b, On the validity of Idiophyllum rotundif olium Lesquereux, a (P,c) 

 fossil plant from the Coal Measures at Mazon Creek, Illinois: Am. Jour. 

 Sci., ser. 4, v. 14, no. 8l, art. 23, p. 203-204. 



SELLARDS, E. H. , 1903, Codonotheca , a new type of spore-bearing organ from the Coal (P,c,s) 

 Measures: Am. Jour. Sci., ser. 4, v. 16, p. 87-95. 



SEWARD, A. C, 1917, Fossil plants: v. 3, Cambridge Univ. Press, London, 656 p. 



SEWARD, A. C, 1923, A supposed Paleozoic angiosperm: Bot. Gazette, v. 76, no. 2, 

 P. 215. 



SHABICA, C. W., 1970, Depositional environments in the Francis Creek Shale, in 



Smith, W. H., R. B. Nance, M. E. Hopkins, R. G. Johnson, and C. W. Shabica, 

 Depositional environments in parts of the Carbondale Formation — western 

 and northern Illinois: Illinois Geol. Survey Guidebook Ser. 8, p. 43-52. 



SHAVER, R. H. , A. M. BURGER, G. R. GATES, H. H. GRAY, H. C. HUTCHISON, S. S. KELLER, 

 J. B. PATT0N, C. B. REXR0AD, N. N. SMITH, W. J. WAYNE, and C E. WEIR, 

 1970, Compendium of rock-unit stratigraphy in Indiana: Indiana Geol. 

 Survey Bull. 43, 229 p. 



SHUTTS, 0. F., and J. E. CANRIGHT, 1955, Recent collections of Pennsylvanian plant (P,c) 

 fossils in Indiana: Indiana Acad. Sci. Proc. (1954), v. 64, p. 70-74. 



SIMON, J. A., 1965, Illinois pioneers in coal geology research: Coal Mining and 

 Processing, August, p. 31-35. 



SIMONS, C. M., 1959, Obituary— Theodor Karl Just: Lloydia, v. 22, p. vi-vii. 



