Structural Features in Illinois
ABSTRACT
Structural geologic features that lie wholly or partly within the state of Illinois have been compiled into a comprehensive catalog. The starting point for this work was Structural Features in Illinois-A Compendium by Janis D. Treworgy (1981). Treworgy's report consisted of a statewide map and bibliography of all previously named and many significant unnamed structural features. All references cited by Treworgy were reviewed, along with many more recently published and unpublished maps and reports on the structural geology of Illinois. The result is an alphabetical listing of 450 named structural features. All well documented significant structures are mapped on Plate 1; 167 previously named structures no longer considered valid are listed in the catalog. In addition, 33 structural features have been renamed and 33 newly named structures introduced. This report also discusses the regional setting of major structures of Illinois and summarizes the structural history of the state.
INTRODUCTION
This comprehensive guide to the structural geology of Illinois gathers from hundreds of published and unpublished sources, information on every named fold and fault in the state, together with many significant, previously unnamed structures. Thus, this is a catalog of structural names, much as the Illinois State Geological Survey (ISGS) Bulletin 95, Handbook of Illinois Stratigraphy (Willman et al. 1975) is a catalog of stratigraphic names.
Structural Features in Illinois was written to serve a variety of users. Students and researchers will find capsule descriptions of all structures, along with references to the detailed original works. Petroleum geologists will find information on the geometry and origin of structures that provide traps in established fields and guide the search for new fields. Mining companies will acquire information on faults that affect minability of coal and on structures that control mineralization of fluorspar, lead, and zinc. Hydrologists will read for data on fault zones that can act as barriers or conduits for flow of groundwater. Environmental geologists and engineers can learn about faults that may affect the stability of abandoned mine workings or the integrity of underground storage chambers for tunneling projects. Many readers will be interested in the latest findings on the history of faulting in southern Illinois in relation to the New Madrid Seismic Zone.
This document expands upon Structural Features in lllinois-A Compendium by Treworgy (ISGS Circular 519, 1981). Based on an exhaustive literature search, the Treworgy report contained a list of references on every named structural feature in Illinois, and a map (scale approximately 1:700,000) showing them all. The task of preparing the present report would have been overwhelming without this groundwork.
There were several reasons for expanding the compendium, patterned after McCracken's (1971) Structural Features of Missouri, to include descriptive and interpretive text on every structure. First, there has been a surge of new structural mapping in Illinois since 1981, and many new seismic profiles have become available. Second, Treworgy's map and list did not assess the relative significance of named structures. Third, many of the most prominent and economically important structures in Illinois were never named and so did not appear in Treworgy's compendium. Fourth, new mapping has demonstrated that many structural features named in earlier publications either do not exist, or their existence is of doubtful validity. This document updates the previous compendium and presents a comprehensive study of the structural features of Illinois. Also included is a brief structural history featuring wells that reached Precambrian rocks (table 1).
| Table 1 Wells that reach Precambrian rocks in Illinois. See figure 4. | ||||||||
|---|---|---|---|---|---|---|---|---|
| Elevation (ft), datum msl | ||||||||
| Well | County | Sec.-T-R | Elev (ft) | TO (ft) | Top of Knox | Top of Mt. Simon | Top of basement | |
| 1 | Amboy Oil and Gas No. 1 McElroy | Lee | 30-20N-10E | 714 | 3,772 | -151 | -1,356 | -3,046 |
| 2 | Northern Ill. Oil and Gas No.1 Taylor | Boone | 28-43N-3E | 815 | 2,998 | absent | -510 | -2,104 |
| 3 | Schulte No. 1 Wyman | De Kalb | 35-41N-5E | 910 | 4,484 | -105 | -810 | -2,953 |
| 4 | Herndon No. 1 Campbell | Pike | 15-4S-5W | 716 | 3,207 | -374 | -2,044 | -2,488 |
| 5 | Panhandle Eastern No. 1 Mumford | Pike | 21-5S-4W | 812 | 2,226 | -58 | absent | -1,409 |
| 6 | Carr No. 1 Vedovell | Lee | 35-20N-10E | 812 | 3,653 | +288 | -888 | -2,653 |
| 7 | Miss. River Fuel No. A-15 Theobold | Monroe | 35-1S-10W | 666 | 2,768 | -293 | absent | -2,093 |
| 8 | Lawinger No. 1 Miller | La Salle | 1-36N-4E | 681 | 3,659 | +435 | -339 | -2,788 |
| 9 | Otto No. 1 Swenson | La Salle | 1-36N-5E | 659 | 3,725 | +539 | -473 | -3,041 |
| 10 | Vickery No. 1 Mathesius | La Salle | 32-35N-1E | 677 | 3,556 | +607 | -744 | -2,838 |
| 11 | H.L. Kelley No. 1 Fullerton | Mercer | 19-13N-4W | 584 | 3,716 | -356 | -1,916 | -2,671 |
| 12 | Miss. River Transmission No. S-5 Baer | Madison | 27-3N-6W | 516 | 4,868 | -2,451 | absent | -4,341 |
| 13 | Humble Oil No. 1 Weaber-Horn | Fayette | 28-8N-3E | 538 | 8,616 | -4,097 | -6,352 | -7,676 |
| 14 | R.E. Davis No. 1 South | Henry | 30-16N-1E | 803 | 3,863 | -500 | -1 ,797 | -3,052 |
| 15 | I. Seele No. 1 Seele | Winnebago | 24-44N-2E | 870 | 3,385 | +255 | -381 | -1 ,786 |
| 16 | C. Reed No. 1 McCoy | Will | 20-35N-9E | 632 | 4,300 | -385 | -1,272 | - 3,593 |
| 17 | Texaco No. 1 Cuppy | Hamilton | 6-6S-7E | 393 | 13,051 | -7,365 | absent | -12,574 |
| 18 | Texaco No. 1 Johnson | Marion | 6-1 N-2E | 541 | 9,210 | 4,835 | -7,909 | -8,629 |
| 19 | Jones and Laughlin Steel Corp. No. 1 WD-1 | Putnam | 3-32N-2W | 527 | 4,877 | -1 ,063 | -2,608 | -4,315 |
| 20 | American Potash and Chemical No. WD-1 | Du Page | 9-39N-9E | 741 | 4,043 | -309 | -1 ,084 | -3,279 |
| 21 | Union Oil of California Cisne Comm. No. 1 | Wayne | 3-1 S-7E | 504 | 11,614 | -7,072 | -10,653 | -11 ,010 |
| 22 | Maryland Service No. S-1 Kircheis | Madison | 27-3N-6W | 504 | 5,018 | -2,446 | -4,462 | -4,506 |
| 23 | Miss. River Transmission Klein No. S-2 | Madison | 33-3N-6W | 513 | 5,213 | -2,655 | -4,631 | -4,688 |
| 24 | North. Ill. Gas No. 1 Lillard | Henderson | 14-9N-5W | 627 | 3,180 | -297 | -1 ,793 | -2,531 |
| 25 | Harza Engineering UPH-1 Commonwealth Edison | Stephenson | 18-29N-6E | 905 | 2,096 | +377 | -260 | -1,090 |
| 26 | R.W. Beeson No. 1 Poiter Unit | Perry | 28-5S-3W | 486 | 7,043 | -4,270 | absent | -6,464 |
| 27 | C.E. Brehm Drilling and Prod. No. 1 Hemminghaus | Clinton | 33-3N-1W | 486 | 7,040 | -4,384 | absent | -6,394 |
| 28 | C.E. Brehm Drilling and Prod. No. 1 Bochantin Comm. | Washington | 35-3S-2W | 458 | 7,332 | -4,588 | absent | -6,838 |
| 29 | Harza Engineering UPH-2 Commonwealth Edison | Stephenson | 12-28N-5E | 996 | 5,442 | +527 | -314 | -1 ,182 |
| 30 | Harza Engineering UPH-3 Commonwealth Edison | Stephenson | 7-28N-6E | 990 | 5,272 | +515 | -319 | -1 , 187 |
| 31 | Ross Production No. 1 Goodwin | La Salle | 30-29N-2E | 739 | 5,775 | -1,148 | -2,811 | -4,881 |
| 32 | U.S. Geological Survey No.1 IL. Beach State Park | Lake | 14-46N-12E | 585 | 3,500 | absent | -1,055 | -2,875 |
| 33 | Thor Resources No. 1 Sleight | Pike | 12-4S-3W | 624 | 3,602 | -682 | -2,362 | -2,946 |
| 32 | Wood Energy No. 1 Borowiak | Washington | 24-3S-1W | 522 | 9,222 | -5,469 | -8,176 | -8,186 |
| Information compiled by M.L. Sargent, ISGS, 1992 | ||||||||
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