ILLINOIS STATE GEOLOGICAL SURVEY. MONOGRAPH No. 1. PLATE LXXXII. 



11 12 13 



: x 



8 9 10 



" 



28 29 30 31 



23 



32 34 



36 37 33 35 38 



) J 



43 44 45 46 47 48 



55 



39 40 41 42 



> s s 



49 51 53 



* 



56 



57 



61 62 63 



; 



* > 



58 5O 54 52 



68 69 59 6O 



65 



64 



66 67 7O 



71 72 



73 



74 



75 



J 



> j 



76 77 78 79 



