86 



ILLINOIS STATE GEOLOGICAL SURVEY CIRCULAR 480 



Tschudy, R. H 51 



Tubicaulis 30, 40 



Tyliosperma 4l 



United States 

 United States 



United States 

 History .. 

 University of 

 University of 

 University of 

 University of 

 University of 

 University of 

 University of 



University of 



University of 

 University of 

 University of 

 University of 

 University of 



u 



Bureau of Mines 43, 46 



Geological Survey ..6-9, 11-13 

 28, 30, 37, 38, 43, 51 

 National Museum of Natural 



6, 7, 22 



Alberta 34 



British Columbia 27 



Buffalo 19 



Chicago ..9-12, 15, 24, 26, 27 



Cincinnati 14, 27, 43 



Connecticut 31 



Illinois 6, 7, 20, 24, 28 



31-34, 36, 38, 43, 45 



Illinois at Chicago Circle.... 



35, 45 



Kansas 29, 30 



Massachusetts 32 



Michigan 11, 14, 19 



Missouri 24 



Wisconsin 31 



Valmeyerodendron 50 



Vermilion River 12 



vitrain 47 



Voss, John 51 



w 



Wabash College 24 



Walker, R. D 4, 46 



Walker Museum 15 , 18 



Waltersburg Formation 50 



Walton, John 26 



Wanless, H. R 8, 22, 26, 36, 43 



Ward, L. P 8 



Warren, A. J 31, 32 



Washington, International Geological 



Congress 22 



Washington University, St. Louis .....21, 24 



29, 30 



17, 18 



Wasson Coal Mining Corporation 



Watson, D. M. S 



Watt, A. D 



Weber, J. N 



Weir-Pittsburg Coal Member 



Weller, J. M 



Western Illinois University 



West Frankfort 



West Kentucky Coal Company 



West Mineral, KS 



Western Michigan University 



Westphalian I 



What Cheer, IA , 



White, C D 7, 8, 11-13, 17-19 



28, 32, 42 



White, I. C 



Whitehead, D. R. . 



Wier, C. E 



Will County, IL .. 



Williamson, W. C. 



Willis Coal Member 



Willis, E. J. M. (see 



Willman, H. B. 



Wilmington, IL 



Wilson, L. R. . 



Winchell, N. H. 



Winslow, M. R. 



Wisconsinan ... 



Witham, H. T. M 



Wodehouse, R. P 



Wood, J. M. ... 



Woodson, R. E. 



World's Columbian Exposition 



Worthen, A. H 



Morgan) 



...16 

 15, 35, 4 



.4, 23 



....19 



.5-7 



30, 37 

 ....25 

 .6, 15 

 ....25 

 ....48 



22, 36 

 33, 38 

 ....34 



13 



12 



14, 15 



23, 27 

 ....11 

 22, 23 

 46, 52 



..19 

 ..44 

 ..23 

 ..22 

 ..11 

 2, 47 



l- 



.4, 46 

 17, 19 



43, 50 

 ....51 



44, 50 



....51 

 ....41 

 ....41 

 24, 40 

 ....29 



7 



50, 52 



Yale University 

 Yochelson, E. L. 



6, 7, 32 

 ..25, 30 



Z 



Zalessky, M. D 10 



Zangerl, R 45 



zonation, stratigraphic 5, 23, 49, 52 



Zygopteris 25, 30, 40 



Illinois State Geological Survey Circular 480 

 86 p., 5 figs., 3000 copies, 1973 

 Urbana, Illinois 61801 



Printed by Authority of State of Illinois. Ch . 127, IRS, Par. 58.25 



