URBANA STATE OF ILLINOIS WILLIAM G. STRATTON, Governor vir:^, &™ and ed — URANIUM IN ILLINOIS BLACK SHALES by M. E. Ostrom M. E. Hopkins W. A. White L D. MPVicker DIVISION OF THE 'o^ N c°' F L ST ^ GE0L °G'CAL SURVEY ti, UnieT URBANA CIRCULAR 203 1955 ILLI ^rn CAI °CT 13 1955 Digitized by the Internet Archive in 2012 with funding from University of Illinois Urbana-Champaign http://archive.org/details/uraniuminillinoi203ostr ,<& URANIUM IN ILLINOIS BLACK SHALES by M. E. Ostrom, M. E. Hopkins, W. A. White, and L. D. McVicker ABSTRACT One hundred and seventy-five samples of dark gray to black shale were taken from outcrops in 44 Illinois counties. The high est percent equivalent uranium, determined by radiometric assay T W "^ "" -° 17 - The UraniUm ° xide < U 3°8> of 15 of the shale samples having the higher percent equivalent uranium ranged bet . 001 and . 014 percent _ ^ ^J -mum 002 percent lower than the percent equivalent uranium for these m, ,T "7 "• Ph ° Sphatic nodules «* bands found in relatively small quantxhes m some black shales gave a higher percent equi- valent uranium than the shales in which they occur, ^e mL'mum uram um oxide content of the phosphatic materials investigated w" ment'f^T * *' "^^ af>PearS t0 meet th * require- ment for the mxmmum grade of ore on which the Atomic Energy Commission has published prices. Numerous requests have been received by the Illinois State Geological Survey for information regarding the significance of Illinois black shales - possible sources of uranium. This report gives the results of i investigation to supply such data It Whlf ^ preliminary and C. W. Spencer aided in the collection of samples. "adoury, Geologic Age and Thickness ! Pian^nd MTs k sis h stpian S Un ° iS *" PrlnCipa1 ^ °^ennsylvanian, Mississip- inve^tigatS ;rTm "s o7r an , age : ^ ° rd ° vician 8«Y ^ales were also «— A, n^tra^yvVnlntblir ^ " '^^ —" - *» m.l^rSr?' TV ° CCUr ^^ C ° m ™*y ab °- coal beds. They o^ «2Ztl:tz£ r>:\ aie usually iess *•» 5 feet thick ' »* « Y op w«tern mlnois an H '7 eX " Pt '" ^ n ° rthern fifth > P ortions * Pies of pZitr S ° Uthern UUn0iS - °" e hund " d and twenty sam- Outcroos of r , ! u S W6re mClUded in tMs investigation. e«rem P Lrn and 3 t , ^^ '"'" (UpPer Missi ^PPian) occur in southern and southwestern Illinois. Most of these shales are dark gray [1] ILLINOIS STATE GEOLOGICAL SURVEY Fig. 1. - Locations of shales sampled. URANIUM IN ILLINOIS BLACK SHALES 3 to grayish Mack. The maximum thickness sampled from an outcrop was 25 feet. Twenty-two samples were taken. The Hannibal and Maple Mill shales of the Kinderhook series (Lower Mis- sissippi crop out in Jersey, Pike, and Calhoun counties in western HHnot Fxve samples were taken in Jersey County, two in Calhoun, and two xn P k e The shales are gray to dark gray. e- Mississippian-Devonian black shale crops out in Hardin County, where it xs known as the New Albany shale, and in Union County, where xt is known a* the Mountain Glen shale. It has a maximum thickness^ 50 feet in Urnon bounty oni?a°bo ?2 Y 5 a f S 7f "," /"' ** "^ ^^ H °—- in Hardin CouTy' only about 25 feet of relatively unweathered shale suitable for sampling was found. Nineteen samples of southern Illinois shale were obtained Another shale of Mississippian-Devonian age, the Grassy Creek shale oc- curs xn Pike County It is about 50 feet thick and dark gray to black. Two fxve- foot samples were taken. in-luded , 0r ,t VlCi ^ <^ a<1UOketa > shale is °^inarily gray. Three samples were included in this study because the formation is comparatively thick and is com- monly exposed xn parts of Calhoun County and in northwestern Illinois. Phosphatic Materials So ™ of the Pennsylvanxan black shales contain small pebble-like nodules and lenticular bands or irregular masses of brownish-gray phosphatic mate- r al, whxch . w , ge ne rally more radioactive than the shale in which they occur. Samples D6c, D9a, D9b, D77a, and D103 contain phosphatic materials. The basal few feet of the Maquoketa shale in Jo Daviess County also in- cludes scattered phosphatic nodules. Sample M9 contains such nodules. Character of Black Shales The dark gray to black color of Illinois shales is caused primarily by car- that a co OUS Tf rla1 ' The Shal6S are beUeVed t0 We been de P-"^ in seas tardTrmf tT ^f 1 ? 3 ° f the State/ Many ° f the black ' or * lm °st black, slate's "w\ h k int ° ^ layerS " e kn ° Wn P«P^'ly ™ "Mack sxates, but they are not true slates. lrnn S °^ WaCk ShaleS ' eS P ecialI y &e h ard black shales above coals, contain whTchl at " f" n" ° f the braSSy yell ° W mlneralS Py " te »* —site, XL o^:: y ur or to yeiiow - brown - ° r red minerais c ° m p°- d Sampling and Preparation for Testing sonabTv mPleS T 6 tak6n ^ StrlP mlneS ' r ° ad CUtS ' and stream c ^ ^ere rea- we a wrrH ea ^ e r d mat6rial "^ ^ ° btained - Sam P leS Were "Uected to forL oft " " thr ° U 8 hout fte St ^ (fig- 1) and to represent the ma- wer taL t PP g Shal6 "**' "* io *™«°™ (table 1). Most samples "ess ofi. CU " lng ChamlelS " the faCe ° f eXP ° Sed r ° Ck - The ^-test thick- about 20 no , repr c Sented ^ ^ ""P 16 WaS ei g ht feet; the sample weighed pounds. Samples were crushed to a maximum diameter of about 1/10 IL , IB 0. S STATE OSCOO.CA, SURVEY a crushed sample follows. Mesh size Percent +8 I- 6 -8+16 31.6 .16+35 27 - 2 .35+65 u - 7 .65+100 13 -3 .100+150 2 - 5 -150 12 - X »A* with a laboratory model Geiger counter, Radiometric assays were made with *££ * Atomic Energy C om- whi ch was -«^^ ^^^S^ of radioactive materials mi ssion. The assays indicate *°^£ ra dioactive substances as well as ura- content. - d conte nt were made according to pro- Chemical analyses for uranium oxide ^c in ^.j, booklet , cedures recommended **/%%%£££! of Uranium and Thorium n M anual of Analytical Methods for toe Deter ^^ ^^ DU i2£^=i^ , K?^ 3- — d against samples sup- were analyzed chemically. They ™" "^f^* ^d formations. Most of P ercent) * Results of Tests „„ 17-i samoles of shale are given Results of equivalent uranium «says on 175 sarnp^ ^ ^ Conclusions Ml the shale samples tested gave uranium °^°~ ^J ^ values below .02 percent (2/100 of one ^"^^^^contLns .1 percent which the Atomic Energy Commission has quoted ^ ^^ appears (1/ 10 of one percent) uranium oxide. Thus none ol t io be of commercial importance ^^^^anium oxide (table 3, in Chemical determinations of the P ercentag ura nium oxide content ■ 15 representative shale samples showed a — — ^ percent .014 percent. The percent e^nt ura-m was lughe ^ ^ ^^ uranium oxide in nine samples. It was lower y for five samples and equal for one sample. URANIUM IN ILLINOIS BLACK SHALES 5 The ranges in percent equivalent uranium for shales „(ti , ages represented were: Pennsylvanian, 000 to 017 Mi,^ g60l ° giC .009; Devonian-Mississippian, .001 to 014 and Ordn ^.""'W 1 ". - 000 to Chemical analyses of certain I, Ordovioan, .001 to .002. to .014 percent for tL Z « am Pl" gave ranges in uranium oxide of .001 M . P«cent for the Pennsylvanian shales and .006 to .013 percent for H, Mississippian-Devonian «v.=>i„ = r> * • . percent tor the assays were low. because the radiometric shaieTwtTnrrth^TSr,:: ^r-- uranium -*•• - - recorded from a Gallatin Sulty sample iC^- * r^ UIaniUm ' W " more samples having eauivalenLr^fum vllt IT xc'e ^^ ~~ „ the higher value in each countv in or d,, „t * percent and Gallatin, .017; Saline, .0,6, ^^^^^^^^'^7 Jhnson, and Williamson, .012, and Pulton. g Je ff e ; son , ^.^J'^SL. pies ^'^s±si7t^ f eq T? ieat uranium vaiues ° f —- values also vary nJ^^g^g^JJ™^ *-. units represented by two or more samn ,„ s v ° rmatlon or Ulut . The geologic valent uranium values were Z StoneW ^!J ng . the "«*"* average equi- .008 percent, and the N Iw llbanv T " ^^ ShaleS With avera § es «* shales with a .007 per cotter ag e ^ ^ ****• — C ° h " J* The Mississippian and ---^^^.SSSE^^ •i-^^^"^^^^.^' •***— * uranium values the black shales was !Sl7 Srcenf fo^" 1 "" 1 *"**?** Ura * ium -due for rhe average equivalent uralTvalt o g b£ shSeT^ ^ ^ or 73 gray and dark-gray shales, .004 percent **"**' W " - 005 ' Phosphatic bands and nodules in the blark »h=,i . u j han the associated shales Th» I T I had S reate r radioactivity ■ranium oxide P rcentages' elual to" Ph ° SphatiC Sam P les tested chemically had •alues. Bands of phoXi mal^al § T"' ^ ^^^ "anium ■resented by sampTe D77 I material ° ccu rnng between layers of shale re- s compare! wtt7a 003 per ce "t 1 * ^ *•"«* *^™^ "anium hatic materill togemer «*•""** ""^ *» the Shale and Ph°s- ILLINOIS STATE GEOLOGICAL SURVEY Table 1.- Sequence of Shale Beds and Geologic Units Sampled Beds sampled Geologic unit Pennsylvania!! (Coal Measures)* McLeansboro group Shales above Upper McLeansboro coals Shale above Shumway coal Shale above Trowbridge coal Shale about 10 ft. below Trow- bridge coal Shale about 25 ft. above Omega lime stone Shale above Upper Bogota coal Shale above Cohn coal Shale above coal that crops out near town of Divide Shale below limestone Shale about 50 ft. above Shoal Creek limestone Shale about 30 ft. below Livingston limestone Shale below Shoal Creek limestone Shale above Macoupin coal Shale above Brouillett coal Shale above Exline limestone Shale below Lonsdale limestone Shale above lower Scottville coal Shale above Cutler Rider II coal Shale above No. 7 coal Shale above Jamestown limestone Shale above Herrin limestone Shale above No. 6 coal Position uncertain Shumway Shelby Shelby Unnamed Bogota Cohn Unnamed Sample numbers D15, D16, D20 D14, D96 D13 D12 D97 D47, D49U, D49L, D50 D9, D9a, D9b D17, D18, D19, D90 D94, D95 LaSalle and Livingston D57, D86 Unnamed Unnamed Shoal Creek Macoupin Brouillett Gimlet Gimlet Gimlet Unnamed Spar land Carbondale group Jamestown Brereton Brereton D78 D2, D87, D93 D10, Dll, D21, D70, D72, D92, D99 D44, D71, D73, D77, D77a, D88, D89, D9L D98 D85 D63 D10Z D74 D30 D5, D5a, D5b, D59, D60, D65, D69, D100 D81 D80U, D80L D4, D6a, D6b, D6c, D31, D46, D51, D79, D82 *Most of the units in the Pennsylvanian system are called cyclothems. URANIUM IN ILLINOIS BLACK Table 1. (continued) SHALES Beds sampled Shale above No. 5 coal Shale above No. 4 coal Shale above No. 2 coal Shale above Dekoven coal Shale above Davis coal Shale above Campbell Hill coal Shale below Seahorne limestone Shale above Stonefort limestone Shale below Stonefort limestone Shale above limestone (D6la and D62a at base of exposures) Shale below limestone Shale above Murphysboro coal "Ava" shale Shale above Willis coal Shale at position of Reynolds - burg coal Shale at position of Battery Rock coal Shale below Battery Rock coal Shale Shale Shale about 25 ft. above base of formation Shale at base of formation Shale 25 ft. below top of formation Shale 27 1/2 ft. below top of formation Shale from top of formation Shale from base of formation Shale at contact of formations Geologic unit St. David Summum Liverpool Trade water group Dekoven Davis Unnamed Seahorne Stonefort Stonefort Seville Seville and Curlew Unnamed "Ava" Grind staff Caseyville group Pounds Battery Rock Battery Rock Mississippian Chester series Sample numbers Dl, D37U, D37L, D53 : D54, D55, D64, D66, D67, D103 D3, D3a, D3b, D33, D38, D52, D76 D22U, D22L, D42, D56, D58, D68, D75, D101 D26, D34 D24, D25, D32 D83 D43 D23, D27, D35 D28 D6la-f, D62a-d D29, D45, D48 D7, D39U, D39L D8 D84 D36 D40 D41 Clore formation A21-A24, A27, A32 Clore formation A5 Clore formation A6 Clore formation A7 Clore formation A8 Clore formation A25 Clore formation A26 Clore and Palestine formations A30 ILLINOIS STATE GEOLOGICAL SURVEY Table 1. (continued) Beds sampled Shale below A30 Shale Shale below A28 Shale at contact of formations Shale; samples in ascending order A2, A3, and A4 Shale Shale near top of formation Shale at base of outcrop Shale, 0-3 and 5-7 ft. above A42 Shale at top of formation Shale Shale, above A3 7 Shale from base of formation; in ascending order A39, A40, A41 Shale, A45 above A44 Shale, 35 ft. above creek Shale, at base of formation Shale 10 to 30 ft. above base of formation; samples in ascending order Upper 25 ft. of formation; samples in descending order Shale, position in formation not known; samples in descending order Shale, position in formation not known; M6 above M7 Shale, position in formation not known Shale below 6 in. red zone in basal part of formation Geologic unit Palestine formation Menard formation Menard formation Menard - Walter sburg formations Sample numbers A31 A28 A29 Al Waltersburg formation A2-A4 Tar Springs A33 Kinderhook series Hannibal formation A34 Hannibal formation A42 Hannibal formation A43 Hannibal formation A46 Maple Mill member (black-shale facies) A37 Maple Mill member (black-shale facies) A38 Maple Mill member (black-shale facies) A39- ■A41 l-Mississippian Grassy Creek forma- tion! A44, A45 Mountain Glen forma- tion! A9 Mountain Glen forma- tion! A10 Mountain Glen forma- tion! All- •A14 Mountain Glen forma- tion! A15- ■A19 New Albany formation! M1-M5 New Albany formation! M6, M7 New Albany formation! M8 Ordovician Maquoketa formation A35 URANIUM IN ILLINOIS BLACK SHALES Table 1. (continued) Bads sampied Geologic ^ Sampie ^^ Shale above 6 in. red zone in basal Shaw ' f0r ^ ati ° n Maquoketa formation A36 Shale from "Depauperate zone" near base of formation **-* i , * Maquoketa formation M9 tThese formations are roughly the same geologic age. 10 ILLINOIS STATE GEOLOGICAL SURVEY Table 2. - Location and Percent Equivalent Uranium of Shale Samples Sam- ple Location Thickness Sample source! County 1/4 1/4 1/4 sec. T. R. inches % eU* ! Bond Bureau D78 D46 SW NE SW NE SE NE 19 29 6N 4W 16N 6E 10 .000 .006 Stream cut Strip -mine dump ii Calhoun D57 A34 NE SW NW NW NE 33 35 16N HE 9S 3W 7 60 .000 .007 Stream cut Weathered bluff** 1 1 A3 6 A3 5 SE NE SE NE SW SW 17 17 IIS 2W IIS 2W 60 60 .001 .002 Valley wall** Valley wall** it A46 C SW NE 23 12S 2W 72 .005 Quarry** Cass Clark D101 D90 D91 D92 D93 SW SW SE SW SE NE SE NW SW NW NE NW SE SE SE 11 4 3 3 3 18N HW 9N 12W 9N 12W 9N 12W 9N 12W 26 22 31 10 32 .001 .004 .004 .004 .001 Bluff Stream cut Stream cut Stream cut Stream cut** D89 NE NW NW 20 UN iow 33 .009 Road cut ii D94 SE NE SE 30 12N 12W 12 .004 Road cut Clay ii D50 D97 SW SE SW SW SW SW 32 10 3N 8E 4N 5E 72 .004 .006 Stream cut Valley wall Clinton D99 D98 SW SE NE SW SE NE 22 13 2N 5W 3N 1W 26 12 .012 .000 Stream cut Stream cut Coles Crawford Edgar ii D95 D47 D88 D87 SW SW SE SW SW NE C SE NW SW SW 3 14 29 2 12N 10E 5N HW 14N 10W 14N HW 10 32 16 15 .002 .002 .009 .000 Stream cut Stream cut Stream cut Stream cut** ii D86 SE SE SE 10 14N HW 24 .006 Stream cut it D85 NW SE NW 32 15N 10W 14 .002 Road cut Effingham it D96 D14 SE NE SE SE NW SW 28 26 6N 6E 9N 5E 31 34 .003 .001 Stream cut Stream cut Fulton n D67 D42 N NE NW NE NW 3 17 3N 2E 5N 4E 15 24 .007 .006 Strip mine Stream cut ,, D66 NW SW SW 28 6N 3E 20 .002 Strip mine ii D43 SW SE NW 14 7N IE 15 .002 Stream cut Gallatin D44 SE NE NW 16 9S 10E 30 .017 Stream cut Dl C NW 16 10S 8E 36 .004 Strip mine Greene D76 NW SE NW 21 12N HW 30 .003 Strip mine** D75 SW SW SW 24 12N 11W 30 .009 Strip mine Grundy ti D54 NW SE NE 1 32N 7E 18 .002 Stream cut D53 SE NW NW 20 33N 7E 22 .004 Stream cut *eU = equivalent uranium. **Gray, dark gray, or grayish black. |A11 samples are black except those double -starred. URANIUM IN ILLINOIS BLACK SHALES 11 Table 2. (continued) C ounty Hardin Sam - Location pie 1/4 1/4 1/4 sec. Henry it Jackson Jefferson Jersey Jo Daviess Johns on Knox LaSalle Logan Ml M2 M3 M4 M5 M8 M6 M7 D48 D45 D7 D83 D8 D38 D39U D39L D84 D40 D41 D15 D16 D17 D18 D19 D20 A38 A3 7 A41 A40 A3 9 M9 D36 A28 A29 D64 D51 D56 D52 D58 D55 D102 SW NW SW NW SW NW SW NW SW NW SW SE SE NE SE NE SE NW NE NE NW NE NW SE SE SE SE NW NE SW SE SE SE SE SE SE NE NE SE NE SW NE NE 25 25 25 25 25 30 31 31 11 33 22 4 35 NW 35 NE 36 NE SW SW SE SW NW SW NW SE SW NW SW NW SW SE SE SE SE NE NE NE NE SW SE SW SE SW SE NE SE SE NE NE SW SE SE SE SE SE SW NE NE SW SE SW NE NE NE NW NW SE SW SW SE SE SE SE SE NW SW SE NE NW S SE SW SE NE NE NE 36 19 33 33 7 22 7 13 13 35 4 4 34 NW 34 NW 34 26 33 36 1 8 9 8 32 3 21 7 US US us US US US us us 14N 14N 7S 7S 7S 8S 9S 9S 9S 10S 10S IS IS IS 3S 3S 4S 6N 6N 8N 8N 8N 29N US 12S 13S 9N 3 IN 32N 32N 33N 33N 19N 7E 7E 7E 7E 7E 8E 8E 8E IE IE 3W 4W 4W 1W 1W 1W 2W 1W 1W 3E 3E 4E 3E 3E 4E 12W 12W 13W 13W 13W 2E 4E 4E 4E 4E 3E 2E 3E IE 5E 3W Thicknes: inches 36 60 60 60 60 48 60 60 30 30 48 36 30 60 24 22 18 18 15 15 38 12 40 60 60 60 60 60 12 27 72 48 22 24 22 29 14 14 % eU* Sample source f .003 .003 .003 .014 .009 .003 .001 .006 .006 .004 .000 .003 .003 .008 .001 .003 .003 .000 .001 .005 .011 .003 .003 .000 .001 .007 .008 .000 .004 .004 .002 .012 .003 .001 .008 .000 .008 .007 .002 .004 .000 Stream cut** Stream cut Stream cut Stream cut Stream cut Road cut Road cut Road cut Mine dump Mine dump Strip mine Stream cut Stream cut** Mine entry Strip mine Strip mine** Stream cut** Stream cut Stream cut** Stream cut Road cut Road cut Stream cut** Stream cut Stream cut Stream cut** Stream cut** Valley wall** Valley wall** Valley wall** Railroad cut** Stream cut Railroad cut** Railroad cut** Strip mine Road cut Stream cut Stream cut Stream cut Stream cut Blocks from quarry floor** 12 ILLINOIS STATE GEOLOGICAL SURVEY Table 2. (continued) Sam- Location Thickness County ple 1/4 1/4 1/4 sec. T. R. inches % eU* Sample source! Macoupin ii D77 D73 SW SE NE NE SE SW 12 35 7N ION 7W 7W 24 24 .003 .006 Stream cut Stream cut ii D72 SW SW SE 35 ION 7W 36 .004 Stream cut ii D74 NW SW NW 16 12N 9W 18 .006 Stream cut Menard Montgomery D100 C NW NW 36 18N 7W 12 .005 Stream cut Dll D71 SW NE SW SE SE NW 21 28 7N ION 4W 3W 18 26 .009 .004 Stream cut Stream cut Peoria ii D59 D63 C SE C NE 23 3 7N 8N 7E 5E 7 4 .002 .003 Road cut Stream cut n D69 NE NE SW 11 8N 7E 14 .006 Road cut D65 NE SW 28 9N 6E 10 .002 Road cut Pike n A45 NE SW 17 6S 5W 60 .008 Stream cut** A44 NE SW 17 6S 5W 60 .003 Stream cut** it A43 C NW NE 24 7S 4W 60 .003 Road cut** ti A42 C NW NE 24 7S 4W 60 .003 Road cut** Pope n A25 SW NW SE 19 12S 5E 48 .002 Railroad cut A21 SE SE SW 19 12S 5E 36 .006 Railroad cut it A22 SE SE SW 19 12S 5E 48 .000 Railroad cut*" ii A23 SE SE SW 19 12S 5E 24 .000 Railroad cut ii A24 NW SW SE 19 12S 5E 42 .000 Railroad cut ii A27 SW NW SE 19 12S 5E 72 .002 Railroad cut ti A26 SW NW SE 19 12S 5E 48 .003 Railroad cut n A30 NW SW SW 30 12S 5E 60 .008 Railroad cut it A31 NW SW SW 30 12S 5E 60 .006 Railroad cut n A33 SE SE SE 11 13S 6E 90 .001 Road cut Randolph D81 NE SW NE 36 5S 5W 33 .001 Strip mine D80U NE SW NE 36 5S 5W 60 .000 Strip mine ii D80L NE SW NE 36 5S 5W 60 .000 Strip mine it D82 NW SW NE 36 5S 5W 34 .002 Strip mine it Al NW NW NE 32 7S 6W 60 .006 Stream cut it A2 NW NW NE 32 7S 6W 60 .007 Stream cut it A3 NW NW NE 32 7S 6W 60 .005 Stream cut ii A4 NW NW NE 32 7S 6W 36 .001 Stream cut it A5 SW NE SE 33 7S 6W 30 .004 Stream cut ti A6 SW NE SE 33 7S 6W 48 .003 Stream cut it A7 SW SE SE 2 8S 6W 24 .002 Quarry ii A8 SW SE SE 2 8S 6W 30 .009 Quarry Richland D49U SW SW SE 15 3N 10E 36 .006 Stream cut ii D49L SW SW SE 15 3N 10E 36 .000 Stream cut Rock Island D61a NE NE SW 1 16N 5W 60 .007 Stream cut it D61b NE NE SW 1 16N 5W 60 .004 Stream cut it D61c NE NE SW 1 16N 5W 60 .002 Stream cut URANIUM IN ILLINOIS BLACK SHALES Table 2. (continued) Sam- Location Thickness County pie 1/4 1/4 1/4 sec. T. R. inches % eU* Sample sourcet Rock Island D61d NE NE SW 1 16N 5W 60 .004 Stream cut » D61e NE NE SW 1 16N 5W 60 .006 Stream cut D6lf NE NE SW 1 16N 5W 60 .001 Stream cut D62a SE SE SW 6 16N 5W 60 .000 Road cut " D62b SE SE SW 6 16N 5W 60 .004 Road cut D62c SE SE SW 6 16N 5W 60 .000 Road cut " D62d SE SE SW 6 16N 5W 60 .002 Road cut St. Clair D79 SE SE NW 31 IN 8W 31 .003 Strip mine Saline D21 NE NE SW 33 7S 6E 10 .007 Stream cut D31 SW NE SW 29 9S 5E 23 .008 Strip mine D26 NE NW 21 10S 5E 30 .002 Strip mine D25 NE NW 21 10S 5E 22 .007 Strip mine D27 NW NE NE 30 10S 5E 35 .013 Railroad cut D28 NW NE NE 30 10S 5E 20 .001 Railroad cut D24 NE SE NE 30 10S 6E 10 .016 Stream cut " D23 NE SE NE 30 10S 6E 17 .004 Stream cut D22U C SW NW 5 10S 7E 15 .007 Stream cut D22L C SW NW 5 10S 7E 18 .008 Stream cut Sangamon D70 NW NE SW 3 13N 5W 17 .014 Stream cut Schuyler D68 cen. sec. 36 2N 1W 38 .011 Stream cut Shelby D13 NW NW NE 14 ION 6E .002 Mine dump D12 NW NE SW 22 ION 6E 30 .003 Road ditch Tazewell D60 NE NE NW 18 25N 4W 5 .004 Stream cut Union A3 2 SE SW SE 33 IIS IE 72 .000 Stream cut** A20 NW SE SW 26 US 1W 36 .006 Road cut A14 C NE 34 US 2W 60 .008 Stream cut** A13 C NE 34 US 2W 60 .007 Stream cut** A12 C NE 34 US 2W 60 .011 Stream cut** All C NE 34 US 2W 60 .013 Stream cut** A9 SE NE NE 34 US 2W 60 .007 Stream cut** " A10 SE NE NE 34 us 2W 24 .008 Cut bank** A15 SW NW SE 14 12S 2W 60 .005 Valiey wall** A16 SW NW SE 14 12S 2W 60 .008 Valley wall** " A17 SW NW SE 14 12S 2W 60 .008 Valley wall** A18 SW NW SE 14 12S 2W 60 .008 Valley wall** A19 SW NW SE 14 12S 2W 60 .004 Valley wall** Vermilion D3 SW NW NW 13 18N 11W 14 .011 Stream cut D3a SW NW NW 13 18N 11W 5 .002 Stream cut** D3b SW NW NW 13 18N 11W 4 .003 Stream cut** D4 SE SE SE 6 19N 11W 23 .007 Stream cut D5 SE 4 19N 12W 17 .002 Strip mine** D5a SE 4 19N 12W 3 .004 Strip mine, top 3 in. of A5** 14 ILLINOIS STATE GEOLOGICAL SURVEY Table 2. (continued) County Sam- ple 1/4 1/4 Location 1/4 sec. T. R. Thickness inche s %eU* Sample sourcet D5b SE 4 19N 12W 1 .002 Strip mine, bot- Vermilion tom 1 in. of A5=* ii White ti Williamson ii ii ii D2 D9 DIO D37U D37L D30 D6a NW SE SE NW SW SW NE NE SW NE SW SW SE SW SW NW NE 31 21 17 4 4 10 28 19N 3S 7S 9S 9S 9S 9S 13W 14W 10E 2E 2E 4E 4E 12 12 36 36 41 9 .004 .007 .005 .001 .006 .001 .011 Stream cut Stream cut Stream cut Strip mine Strip mine Stream cut Strip mine, bot- tom 9 in. M D6b NE NE 28 9S 4E 21 .006 Strip mine, upper 2 1 in. 11 II II II II D33 D34 D32 D35 D29 NW NW NE SW NW SE SW SE SW NE NW NW NE NW SW 4 16 16 22 30 10S 10S 10S 10S 10S 4E 4E 4E 4E 4E 36 24 33 18 .001 .006 .001 .012 .002 Stream cut Valley wall Stream cut Road cut Road cut URANIUM IN ILLINOIS BLACK SHALES 15 00 O o CO — • "tf< co co nO I— t <— I r— I © O © © © a cu rt a © o o r-t co f- co o 1 — 1 + co Q Q Q <: s i— i CO ^ CO o "ob O CO 00 o CO _ ^ CO 00 CO •—t © i-H © © Q Q Q Q Q 3 w cu o u CD & '. CO CO o <* sO CM 00 o ■