BEDROCK GEOLOGY OF OREGON QUADRANGLE Institute of Natural Resource Sustainability William W. Shilts, Executive Director OGLE COUNTY, ILLINOIS STATEMAP Oregon-BG ILLINOIS STATE GEOLOGICAL SURVEY E. Donald McKay III, Director Mary J. Seid 2010 2 0 35 766 800 36 80 0 0 819 34 31 Op 70 Boat 33 10 E. R. 11 E. R. 32 815 75 800 72 Ramp 741 768 799 694 Og 0 0 32 0 75 80 80 676Q 0 850 75 694 72 700 Og BM 691 0 75 676Q Q 70 692 0 Parking T. 25 N. 704 80 792 8020 687 720 707 730 T. 24 N. Æ 692 T. 25 N. 748 718 692 0 696 Drag 75 800 823 720 697 T. 24 N. 704700 756 Æ Race Quarry Æ Track 0 70 75 0 0 70 800 730 750 0 75 70 0 Road 697 Side Op Park 0 700 2 800 75 5 5 0 3 75 709 70 1 687 0 4 6 741 682 704Æ 700 705 676 EXPLANATION 0 714 80 Rock 70 0 842 842 Quarry 0 70 709 850 0 75 Quaternary 0 70 Op Q Cahokia Formation Op 0 709 728 75 Peoria Silt Q 714 Holocene and 684 869 830 Quaternary 797 Equality Formation 735 Pleistocene 700 Henry Formation 700 687 0 Roxana Silt 80 Quarry Glasford Formation S 115 756 702 k" 0 Æ 75 800 Og Unconformity 75 709 714 St. Peter 0 684 Galena Group Og 70 Dunleith Formation 70 0 8 0 7 784 Q 12 10 Quarry Guttenberg Formation 850 8 9 11 741 800 Road Q Æ 745 823 750 858 Side 850 682 0 756 80 Park 75 800 0 0 AЈ 85 Platteville Group 750 802 Op 0 Quimbys Mill Formation 760 735 80 Nachusa Formation 843 Q Mohawkian 750 C 106 Grand Detour Formation 0 k" 0 70 80 Og St. Peter Mifflin Formation 758 S 230 Ordovician 0 k" 837 861 830 70718 768 779 Pecatonica Formation 789 St.Peter BM 860 80 682 863 Unconformity 0 85 7560 0 75 C 185 Ancell Group k"St. Peter 800 2 0 C 54 Oa Glenwood Formation 75 k" Og Quimbys Ck"118 733 Mill Glenwood St. Peter Sandstone 761 C 125 85 802 0 k" 70 0 817 C 151 Pecatonica 0 80 85 Unconformity 0 k" 0 Pecato85nica C k" 216 75 85 838 75 0 Glenwood 782 S 72 0 18 BM 0 e" 13 17 Os Shakopee Dolomite 15 14 837 85 Ibexian 16 80 St. Peter 0 723 837 0 17 705 861 Units removed by faulting Op 0 817 80 Cambrian Cambrian St. Croixan 75 Road _ 0 820 Potosi Dolomite 0 Side 75 0 Park 787 0 Power Plant 70 850 Franconia Formation 75 0 75 Cooling Towers Og Op 0 80 750 80 0 0 720 807 750 70270 691 801 879 791 842 S 1500 815 e k" Ç Mt. Simon 699 Quarry 0 89 0 700 80 800 0 85 0 750 Radio 85 848 Op Tower 710 840 828 85 0 0 20 70 23 832 24 19 0 21 80 0 835 20 782 70 835 850 871 700 22 807 887 858 750 681 0 80 850 Symbols 0 Og Op 70 715 ee e Strike and dip of bedding; number 3 40 85 e 704 o 0 indicates degree of dip 0 80 o 0 750 4 85 814 750 70 Horizontal bedding 850 0 0 748 817 75 2 764 825 800 794 871 876 G 745 Q 773 0 804 o 800 Golf 80 750 Vertical joint Course | 0 CEM  80 Op H | 800 G 55 | o 804 5 800 Inclined joint; box on down–dip side o 784 H o| o3 0 843 10 7S5 850 199 12 0 e" 85 Ç Active quarry St. 687 871 o5 Peter 830 0 750 2 0 85 78 Æ Abandoned quarry 0 856 e 80 o 805 D Ä S 205 833 864 2 e0 o e" 70 U 750 29 850 o St. Peter 27 833 30 804 755 75 753 25 853 29 U 5 28 820 856 26 0 Op D 0 80 75 850 Drill Holes 801 0 Og 70 85 80 0 from which subsurface data were obtained 0 0 o 800 851 H | Og e 80 H | o e" 0 Stratigraphic boring G 750 S 250 5 k" 80 H 0 H | G 6 | 725 St. | H 25 | 796 0 G e 10 80 o H Peter e e 85 e" 8 6 7 17 Water well | o G 80 0 o o 15 U o e 892 o 11 16 o o 805 0 0 833 | oe 0 D o 75 85 827 15 892 75 804 855 792 0 800 e 21 80 U o U 0 Labels indicate samples (S) or core (C). D D C k" 125 Numeric label indicates total depth of boring in feet. Ç e 890 St. Peter 85 85 0 Unit label denotes formation at bottom. 0 Quarry 750 Radio850 Tower 85 Dot indicates location accurate within 100 feet. 3 0 e 850 800 o 800 85 850 819 75 0 þ Line Symbols 856 Og 845 0 ü þ Q 0 ^ 33 Oa ü 80 850 ^þ þü^ þþ 34 0 32 32 D 85 e 35 31 85 dashed where inferred, dotted where concealed U 0 Æ 36 o22 827 Picnic 0 2 89 0 80 Area 0 Contact 85 Statue 891 Campground 0 H Ä 85 850 0 809 64 846 80 Anticline D o9 U G 85 12 Op U 0 D G o H G 864 866 Syncline; direction of plunge indicated by arrow D T. 24 N. 900 U 828 868 869 876 876 85 U 0 T. 23 N. 896 T. 24 N. 894 D Sub 878 Fault; U on upthrown side, D on downthrown side 93 "128 Station D T. 23 N. 0 U e 85 900 e 679Franconia 0 907 U 7 D Line of cross section 5 70 0 A AЈ 0 Fair 85 919 0 90 0 D 7 Grounds C 269 o  k" U 88 Eau Claire 65 70 855 Note: Well and boring records are on file at the ISGS Geological Q 0 3 7 800 85 679 o   75 e o 0 Records Unit and are available online from the ISGS Web site. e 0 842 _ 900 906 Boat D 77 Op U Ramps BM 869 897 80 S 200 0 800 0 U 746 k" 90 874 D 869 750 750 Ironton 864 800 Q 743 900 745 89 4 85 0 o 0 13 o 873 D 0 886 886 U o S 283 90 738 Concrete U U k" D St.Peter S 1050 Dam 75 D Radio825 Ç 0 0 89 e" S 145 Æ Tower0 6 Sub e" 794 Quarry 5 Mt. 70 o 1 4 64 0 Galesville Station 0 5 Simon 1170 673 0 830 2 6 85 S k" 80 Oa S 234 Mt.Simon D e 0 717 e" U 814 75 Potosi 758 0 682 682 682 Q 728 75 Ä 0 e 0 80 Park Q Golf 64 850 Course e 850 750 70 S 215 763 743 o 702 0 e" e 2 771 800 699 St.Peter 750 75 797 R. 10 E. R. 11 E. R. 67 Q 0 S 307 0 e" 766 714 0 e 0 Potosi Oa 75 70 75 0 733 718 75 699 694 Q 0 e 700 0 Park 0 75 Athletic 75 Field 0 Os 80 709 0 700 0 70 70 0 Sewage 70 64 Disposal Quarry 738 737 723 717 707 702 705 694 67 723 722 756Æ o 70 0 0 75 0 D 0 12 70  Q U 64 8 70 11 7 Transmission Line 800 8 9 0 12 2 10 709 699 A Base map compiled by Illinois State Geological Survey from digital data (Raster Feature SCALE 1:24,000 Geology based on field work by Mary J. Seid, 2009–2010. Separates) provided by the United States Geological Survey. Compiled from aerial photo- 1 1/ 2 0 1 MILE graphs taken 1977. Field checked 1981. Map edited 1983. Digital cartography by Jane E.J. Domier and Dawn Heckmann, Illinois State Geological 1000 0 1000 2000 3000 4000 5000 6000 7000 FEET Survey. North American Datum of 1927 (NAD 27) 1 .5 0 1 KILOMETER Projection: Transverse Mercator This research was supported in part by the U.S. Geological Survey National Cooperative 10,000-foot ticks: Illinois State Plane Coordinate system, west zone (Transverse Mercator) Geologic Mapping Program (STATEMAP) under USGS award number G09AC00197. The 1,000-meter ticks: Universal Transverse Mercator grid system, zone 16 views and conclusions contained in this document are those of the authors and should not BASE MAP CONTOUR INTERVAL 10 FEET be interpreted as necessarily representing the official policies, either expressed or implied, NATIONAL GEODETIC VERTICAL DATUM OF 1929 of the U.S. Government. Recommended citation: Seid, M.J., 2010, Bedrock Geology of Oregon Quadrangle, Ogle County, Illinois: Illinois This map has not undergone the formal Illinois Geologic Quadrangle map review pro- State Geological Survey, USGS-STATEMAP contract report, 2 sheets, 1:24,000. cess. Whether or when this map will be formally reviewed and published depends on the © 2010 University of Illinois Board of Trustees. All rights reserved. resources and priorities of the ISGS.