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TABLE 6.-INTERVALS BETWEEN TOP OF NO. 6 COAL BED AND TOP OF VARIOUS OTHER I
EDWARDS COUNTY 57 electric logs indicate the position of the thicker or thickest limestone bench when two or three benches are present. The thicker of two benches may be at the top or at the bottom. Where there has not been stratigraphic shortening as a result of faulting, the top of the West Franklin limestone is between 231 and 299 feet above the Herrin (No. 6) coal bed-that is, the base of the Mc- Leansboro group (table 6). In the northern two tiers of townships the township average interval declines to between 245 and 263 feet, as compared with 268 and 279 feet in the part of the county south of the base line. "No. 7" coal bed.-The thin coal designated as "No. 7" lies 200 to 225 feet below the West Franklin limestone. The intervening beds are a more or less monotonous succession of dark gray, carbonaceous and micaceous siltstones and shales in the control drill holes (figs. 8, 9, 10). Across this part of the succession electric logs usually show low resistivity, indicative of uniformly shaly beds. At the position of the "No. 7" bed there is usually a slight peak in the normal curve and a recession of the third curve. The opposing patterns of the normal and third curves combine characteristically at this postion and are in evidence in several of the logs of the control drill holes (Nos. 1, 34, fig. 8; Nos. 3, 9, fig. 9; Nos. 8, 10, fig. 10). On the basis of observations at control drill holes and from the study of the pattern of electric logs, the "No. 7" coal bed is in general believed to be not more than 2 to 3 feet thick. Black shale or "slate" 1 to 3 feet thick is reported above the coal bed in 6 of the control drill holes. The interval between "No. 7" and No. 6 coal beds in the twelve townships of the county from which information is available is between 26 and 83 feet, with township averages varying from 36 to 69 feet, being slightly greater south of the base line (table 6). "No. 7" coal bed was not reported in control drill hole No. 106 (fig. lo), perhaps because the observer failed to discover it. Occasionally, however, it appears to be missing in drill holes for which electric logs are the best records available. Hel-)-in limestone and Herrin (No. 6) coal bed.-The recorded depth to the Herrin (No. 6) coal bed in 320 drill holes in Edwards County is generally between 766 and 1021 feet, depending upon the surface altitude and the altitude of the coal bed. The thickness of this bed, as determined from drilling-time observations and cuttings studies of the 14 control drill holes, is believed to be between 3 and 5 feet. The bed appears generally to be overlain by 1 to 3 feet of black shale "slate," above which lies usually 3 to 5 feet of impure, dark gray to black, earthy limestone, the Herrin limestone. It is ordinarily impossible, on the basis of the rate of drilling, to differentiate the black "slate" and the coal bed. In general, thicknesses must be estimated roughly by the amount of coal obtained in the cuttings, but at best the estimate is not satisfactory. In an electric log, it is generally assumed that a swing to the right of the third curve indicates a thickness of the bed greater than the electrode spacing of 53 inches. In most electric logs of drill holes in Edwards County the third curve shows a peak pointing to the right. There is an area of about two square miles in sec. 36, T. 2 S., R. 10 E., and in secs. 1, 2, 11, and 12, T. 3 S., R. 10 E., where No. 6 coal bed appears to be absent (pl. 4). The electric-log pattern is variable.* Two peaks on the resistivity curve of some logs (Nos. 3, 5, 91, fig. 9; Nos. 7, 8, fig. 10) made it possible to differentiate the limestone above and the black "slate" and coal bed below. On the other hand in some logs (Nos. 1, 34, fig. 8 ; No. 8, fig. 10) a single peak appears to 'mark the position of the combined limestone, black "date," and coal bed. In such logs the base of the limestone is placed at a depth representing a reasonable compromise between the position of maximum resistance (the peak of the normal curve) and the positio,n of the maximum millivolts of negative self-potential (the peak of the opposed self-potential curve) if the two points are not at the same depth. If the two depths agree, the position of the base of the limestone is known. 4Tar-lor, Earle F., Pullen, M. William, Sims, Paul K.. and Payne. J. Norman. Methods of subsurface study of the Pennqylvanian strata encountered in rotary-drill holes: Illinois Geol. Survey Rept. Inv. 93, pp. 16-19, 1941.
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SUBSURFACE GEOLOGY AND COAL RESOURC
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ORGANIZATION STATE OF ILLINOIS HON.
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CONTENTS INTRODUCTION BY GILBERT H
Page 7 and 8: PAGE Structure of Herrin (No. 6) co
Page 11 and 12: SUBSURFACE GEOLOGY AND COAL RESOURC
Page 13 and 14: oi the strata below the lower bench
Page 15 and 16: INTRODUCTION 13 less than 1000 feet
Page 17 and 18: INTRODUCTION 15 Grateful acknowledg
Page 19 and 20: INTRODUCTION TABLE 2.-CONTROL DRILL
Page 21 and 22: INTRODUCTION i I County Sec. T. R.
Page 23 and 24: Cumberland County 585 725 731 1130
Page 25 and 26: Jasper County Siltstone 11 ; black
Page 27: Sangamon County Wabash County 467 "
Page 30 and 31: 28 ILLINOIS BASIN COAL RESO UKCES t
Page 32 and 33: 30 ILLINOIS BASIN COAL RESOURCES 1
Page 34 and 35: 32 ILLINOIS BASIAT COAL RESOURCES t
Page 36 and 37: 34 ILLINOIS BASIN C09L RESOURCES la
Page 38 and 39: 36 ILLINOIS BASIN COAL RESOURCES gr
Page 40 and 41: 3 5 ILLINOIS BASIN COAL RESOURCES 1
Page 42 and 43: 40 ILLINOIS BASIN COAL RESOURCES be
Page 44 and 45: 42 ILLINOIS BASIAT COAL RESOURCES W
Page 46 and 47: 44 ILLINOIS BASIhT C014L RESOURCES
Page 48 and 49: 46 ILLINOIS BASIN COAL RESOURCES qu
Page 50 and 51: ILLINOIS BASIN COAL RESOURCES TABLE
Page 52 and 53: 50 ILLINOIS BASIN COAL RESOURCES Lo
Page 54 and 55: ILLINOIS BASIN COAL RESOURCES 34 I
Page 56 and 57: ILLINOIS BASIN COAL RESOURCES EDWAR
Page 60 and 61: 58 ILLINOIS BASIAT COAL RESOURCES H
Page 62 and 63: 60 ILLINOIS BASIN COAL RESOURCES li
Page 64 and 65: 62 ILLINOIS BASIN COAL RESOURCES th
Page 66 and 67: ILLINOIS BASIN COAL RESOURCES
Page 68 and 69: ILLINOIS BASIN COAL RESOURCES TABLE
Page 70 and 71: 68 ILLINOIS BASIlV COAL RESOURCES t
Page 72 and 73: 70 ILLINOIS BASIN COAL RESOURCES as
Page 74 and 75: ILLIxOIS BASIN COAL RESOURCES
Page 76 and 77: 7 4 ILLINOIS KASIAT COAL RESOURCES
Page 78 and 79: ILLIATOIS BASIN COAL RESO URCES GAR
Page 80 and 81: ILLILVOPS iZASIA7 COAL RESOURCES
Page 82 and 83: 80 ILLINOIS EASIN COAL RESOURCES re
Page 84 and 85: ILLINOIS BASIN COAL RESOURCES FEET
Page 86 and 87: 84 ILLINOIS BASIN COAL RESOURCES St
Page 88 and 89: ILLINOIS BASIN COAL RESOURCES 0 I F
Page 90 and 91: ILLINOIS BASIN COAL RESOURCES * 17
Page 92 and 93: 90 ILLINOIS BASIN COAL RESOURCES In
Page 94 and 95: 92 ILLINOIS BASIN COAL RESOURCES gr
Page 96 and 97: 94 ILLINOIS BASIN COAL RESOURCES la
Page 98 and 99: SUBSURFACE GEOLOGY OF HAMILTON COUN
Page 100 and 101: ILLINOIS BASIN COAL RESOURCES ELECT
Page 102 and 103: 100 ILLINOIS BASIN COAL RESOURCES b
Page 104 and 105: ILLINOIS BASIN COAL RESOURCES FEET
Page 106 and 107: ILLINOIS BASIN COAL RESOURCES
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106 ILLINOIS BASIN COAL RESOURCES
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108 ILLINOIS BASIN COAL RESOURCES I
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110 ILLINOIS BASIN COAL RESOURCES P
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f 12 ILLINOIS BASIN COAL RESOURCES
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114 ILLINOIS BASIN COAL RESOURCES C
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1 16 ILLINOIS BASIN COAL RESOURCES
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GULF REFINIXG COMPA:
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ILLINOIS BASIN COAL RESOURCES Count
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122 ILLINOIS BASIN COAL RESOURCES S
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__!L APPENDIX OF TABULATED DATA Abb
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Total depth: The total depth of the
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, -- .- -- ----- - -- I---]=- Locat
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Location of Hole I Twp. 1 Range / S
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Location of Hole TABULATED DATA ON
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t TABULATED DATA ON KEY BEDS CLAY C
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TABULATED DATA ON KEY BEDS CLAY COU
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---- - - - --.-. - - - - - - Twp. L
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Location of Hole I County Number --
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Location of Hole I Twp. 1 Range Sec
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- -- -- - -- *- - -- -- - -. Locati
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Location of Hole TABULATED DATA ON
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Location of Hole I Twp. Range 1 Sec
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Location of Hole County Number TABU
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Page 157 and 158:
TW~. I Location of Hole -- Range SI
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Location of Hole County Number TY p
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Page 163 and 164:
Page 165 and 166:
Page 167 and 168:
Location of Hole I== TABULATED DATA
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Page 171 and 172:
Twp. 1 iiange 1 Sec. TABULATED DATA
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Twp. -- 1N 1N 1N Location of Hole R
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-- TABULATED DATA ON KEY BEDS Locat
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TABULATED DATA ON KEY BEDS EDWARDS
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Location of Hole Twp. Range Sec. Nu
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TABULATED DATA ON KEY BEDS EDWARDS
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Location of Hole I I Twp. Range Sec
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' Location of Hole Twp. Range Sec.
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Location I of I Hole - - -- Twp. Ra
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PENNSYLVANIAN SYSTEM IN ILLINOIS BA
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-- TABULATED DATA ON KEY BEDS -- GA
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TABULATED DATA ON KEY BEDS GALLATIN
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TABULATED DATA ON KEY BEDS I GALLAT
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Location of Hole I L p . Range iec.
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- Twp. Location o Hole Rang< Sec. /
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Location of Hole 1 1 1 Twp. Range S
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-- Location of Hole I F Twp. I Rang
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Twp. Location of Hole I Range Sec.
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TABULATED DATA ON KEY BEDS Location
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Twp. 3 8 Location of Hole TABULATED
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Twp. I TABULATED DATA ON KEY BEDS 0
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TABULATED DATA ON KEY BEDS 10 HAMIL
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Location of Hole I Twp. 1 Range 1 S
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TABULATED DATA ON KEY BEDS HAMILTON
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SYLVANlAM SYSBE A. - - 'aw ek m~c r
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TABULATED DATA ON KEY BEDS HAMILTON
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p-p-ppppp - -- Location of Hole I r
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Location of Hole Twp. Range Sec. TA
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--- -- -- -- - Location of Hole . -
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IAN SYSTEM IN ILLINOiS BASIN
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PENNSYLVANIAN SYSTEM IN lLLlNOlS BA
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I- PENNSYLVANIAN SYSTEM IN ILLINOIS
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1 TIP. Range Sec. . -.-- -- TABULAT
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-f- T I Q Be Q ~n rm O\ - 3 ~ o m+
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NSYLVANIAN SYSTEM IN ILLINOIS BASIN
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2N 2H 1 county TABULATED DATA ON KE
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TABULATED DATA ON KEY BEDS RICHLAND
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Location of Hole Twp. Range Sec. TY
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Page 259 and 260:
PENNSYLVANIAN SYSTEM IN ILLlNOlS BA
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Location of Hole - TABULATED DATA O
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'n, (U - ;I Y .- I- L - (U -0 - 2:
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TABULATED DATA ON KEY BEDS Location
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SYSTEM IN /LLINOIS BAS/ - ma now- e
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- - Location I I of Hole TXP. Range
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-. - - --- - - - -- County Number T
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RICHLAND COUNTY 0 9 ot- OV) urn - -
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TABULATED Location of Hole 1 Type I
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