ILLINOIS STATE GEOLOGICAL SURVEY. 



MONOGRAPH No. 1. PLATE XXIV. 



'U* 



J 



..F V 



9 10 11 12 13 



6 



\W 

 14 



15 16 



J J 



17 is 19 20 21 22 23 24 



29 30 31 32 33 



25 26 27 



34 35 36 37 



m 



38 



4O 28 



41 42 43 44 45 46 



m 



47 48 



A 



W^ 



49 5O 51 52 53 54 



55 



56 

 ' li 



57 58 



59 6O 



61 62 63 



64 



65 66 



o a 



67 68 69 7O 71 



72 



73 



74 75 



76 



I 



77 78 



83 



84 85 86 SO 81 82 



