68 



Coal, bright banded. (Maceration 



1175-J: 271' 9W to 271' 11V4".)... 1% 271 9Vi 



Coal, shaly, very impure; grades into 

 shale. (Maceration 1175-1: 271' 

 11V4" to 272' 1/4".) 1 271 11V4 



Shale, gray, nearly black at top, 

 lighter downward; abundant carbon- 

 ized plant compressions that de- 

 crease downward; grades into shale 

 below. (Maceration 1175-H: 272' 

 i/ 4 " to 272' 11/2".) 1 8i/4 272 V4 



Shale, as above but less carbonaceous; 

 contains abundant small pyritic ag- 

 gregates. (Maceration 1175-G: 273' 

 IO1/4" to 273' 11".) 4 273 8V2 



Underclay, gray, pyritic; contains car- 

 bonized plant remains. (Maceration 

 1175-F: 275' 4" to 275' 5*4".) . . . . 1 8*4 274 1/2 



Shale, gray, like above; becomes silty 

 downward in bottom 4"; abundant 

 carbonized plant fragments includ- 

 ing Cordaites leaves. (Maceration 

 1175-E: 278' 41/2" to 278' 51/2"; 

 maceration 1175-D: 279' 11 1/2" to 

 280' 1/4".) 5 9 275 8% 



Shale, gray, micaceous; contains car- 

 bonized plants including ferns. 

 (Maceration 1175-C: 281' 10%" to 

 281' II1/2".) 7% 281 5% 



Core marker 284 



Shale, gray, silty; carbonized plant 

 fragments but not as abundant as 

 above; grades into shale below.... 7% 284 



Shale, gray, fine grained, interlami- 

 nated with light gray siltstone con- 

 taining plant fragments; fairly even- 

 ly interlaminated but some flow 

 casts present. (Maceration 1175-B: 

 285' IV2" to 285' 21/2"; maceration 

 1175-A: 288' 91/2" to 288' IO1/2".). 4 3Va 284 7% 



Shale, gray, very micaceous, finely 

 interlaminated with gray siltstone; 

 laminae somewhat inclined; some 

 slumping and flow casts 3 5 288 11 



Shale, gray, micaceous, finer than 



above; lenses of light gray siltstone 2 V/i 292 4 



Shale, gray, micaceous, interlaminated 

 with light gray siltstone, more 

 evenly interlaminated than above.. 5 10V4 294 IVi 



FITHIAN CYCLOTHEM — 

 MACERATION 1170 



Outcrop section (NE SW NE 31, 19N-13W, N bank 

 Salt Fork, Fithian Quad., Vermilion Co., 111.) . Illi- 

 nois State Geological Survey samples described by 

 R. A. Peppers, 1961. 



Thickness 

 (ft in) 

 Pennsylvanian System 



Bond Formation 



Sandstone, light gray, fine grained, micaceous, 



medium bedded to massive 14 



Shale, gray, silty, fossiliferous; brachiopod and 

 pelecypod impressions; plant fragments. (Mac- 

 eration 1170-G: 2" interval 3" above base.). 2 4 



Limestone, light gray, massive; abundant shell 

 fragments — crinoids, brachiopods. (Maceration 

 1170-F: 1" interval 14" above base.) 1 11 



Shale, black, carbonaceous, hard, poor cleavage; 

 contains ostracodes; grades into shale below. 

 (Maceration 1170-E: 6" interval.) 6 



Shale, dark gray, silty, calcareous, carbonaceous, 

 conlains brachiopods and ostracodes. (Macera- 

 tion 1170-1): 7" shale interval.) 7 



Coal, somewhat shaly. (Maceration 1170-C: top 



5"; maceration 1170-B: bottom 5".) 10 



Underclay, black, yellow iron stain, crumbly. 



(Maceration 1170-A: top 6".) 4 



8 1/2 30 



I1/2 



31/2 



30 8 1/2 



30 10 



31 11/2 



3 



32 



21/2 



1 



34 



51/2 



10 



34 



61/2 



11/2 



35 



41/2 



HENSHAW FORMATION — 

 MACERATION 1122 



Diamond drill core No. 49, Peabody Coal Com- 

 pany, X- 1,37 1,700, Y-472,400 (Kentucky coordinate 

 system) , Union Co., Ky. Illinois Geological Survey 

 core described by W. H. Smith and D. H. Reinert- 

 sen, 1959. 



Depth 

 Thickness to top 

 (ft in) (ft in) 



Pennsylvanian System 



Henshaw Formation 



Shale, medium gray, slightly silty, cal- 

 careous, rather hard, well laminated; 

 ostracodes, occasional carbonized 

 plant fragment; grades into shale 

 below. (Maceration 1122-Z: 30' 1%" 

 to 30' 21/2".) 



Shale, similar to above but contains 

 abundant shells and ostracodes. 

 (Maceration 1122-Y: 30' 9%" to 30' 

 10".) 



Limestone, medium gray; single dense 

 bed; contains abundant ostracodes. 



Shale, medium gray, silty; bottom 4" 

 contains ostracodes and other shells; 

 grades into limestone 1 



Limestone, light olive gray; single 

 dense bed containing abundant os- 

 tracodes. (Maceration 1122-X: 34' 

 1/4" to 34' 1".) 2 



Shale, dark gray, fissile, very carbo- 

 naceous 



Core broken and disturbed 



Underclay, medium gray, silty, crumbly 



Shale, dark gray, carbonaceous 



Clay, medium gray, slightly silty, ra- 

 ther hard but crumbly; occasional 

 limestone nodule and nodular bed 

 up to 2" thick; contains %" very 

 carbonaceous shale band 1' 2" above 

 base; grades into limestone. (Macer- 

 ation 1122-W: 38' 314" to 38' 4".) 4 



Limestone, light olive gray, very dense; 

 contains abundant shell fossils 



Limestone, light olive gray; light 

 greenish gray clay intermixed; occa- 

 sional shale band; grades into lime- 

 stone below 3 



Limestone, similar to above but more 

 nodular and has greater proportion 

 of greenish gray clay matrix. (Macer- 

 ation 1122-V: 47' 2W to 47' 31/2".) 4 



Clay, greenish gray, crumbly; buff 

 limestone nodules in top 5"; dark 

 pyritic nodules in lower 1' 1 



Clay, dark gray, very soft, carbona- 

 ceous 



Clay, light greenish gray, very soft; 

 contains abundant limestone nodules 1 



Clay, core loss, probably clay 1 



Clay, greenish gray, silty, poorly lam- 

 inated but crumbles readily into small 

 angular fragments; contains lime- 

 stone and pyritic nodules; grades into 

 siltstone 3 



Siltstone, light greenish gray, slightly 

 argillaceous and arenaceous; bottom 

 4" interlaminated with sandstone 

 like that below; contains occasional 

 calcareous nodule; prominent nodu- 

 lar zone 3' below top. (Maceration 

 1122-U: 56' 1" to 56' 11/2".) 7 



Sandstone, light gray, fine grained; 

 beds 6" to 2' thick; bottom 10' 

 medium grained and contains carbo- 

 naceous, micaceous laminae on bed- 

 ding planes 30 



Coal, normally bright banded. (Macer- 

 ation 1122-1: 93' to 93' 4".) 



Underclay, medium gray, very friable. 

 (Maceration 1122-S: 93' 4" to 93' 

 4/2".) 



35 6 

 39 6 



40 



43 10 



6 



47 



11 



3 



49 



5 



6 



49 



8 



3 



51 



2 



52 5 



55 11 



63 



93 



93 4 



