Public - University of Illinois at Urbana-Champaign

More documents

Recommendations

Info

This report is a contribution to the celebrationof the American Bicentennial. The picture ofSpringfield on the front cover touches the history ofIllinois as it shows the Old State Capitol (foreground)and the present Capitol (background). Duringthe past 200 years the political status of Illinoishas changed several times. In 1776 Illinois was partof a county of Virginia, It became part of the NorthwestTerritory in 1787, was designated part of theIndiana Territory in 1800, and became the IllinoisTerritory in 1809. Illinois was admitted as the 21ststate in 1818, with Kaskaskia as the capital. Vandaliawas the capital from 1820 until 1838, whenSpringfield became the capital and the State Legislaturebegan meeting in the Old Capitol, Constructionof the present Capitol was begun in 1868 and completedin 1888,The picture on the back cover shows Decatur,with Lake Decatur in the foreground. Both cover pictureswere provided by the Illinois Department ofTransportation,
Robert E. Bergstrom, Kemal Piskin, and Leon R. FollmerABSTRACTNinety percent of the land area of the Springfield-DecaturRegion of Central Illinois is farmland; however, the economy ofthe region is dominantly urban-industrial. The geology and themineral re sources of the region were mapped to provide a physicalbasis for land-use planning.Unconsolidated, mainly glacial deposits as much as 300feet thick underlie the land surface, the thicker deposits occurringin Ma con County within the Wi sconsinan drift border and the thinnerdeposits in Sangamon County beneath the Illinoian drift plain.The unconsolidated deposits consist of windblown silt and glacialtill in the uplands, and river sediments and glacial outwashbeneath the valleys. Sand and gravel within the unconsolidateddeposits is the main source of ground water in the region; it is aparticularly favorable source in the Mahomet Bedrock Valley innortheastern Macon County. Sand and gravel is also mined as abuilding material along the Sangamon River. The Sangamon andits tributaries are the prime surface-water resources of the region.Additional resources occur in the bedrock beneath the unconsolidateddeposits. The Herrin (No. 6) and the Springfield(No. 5) Coals have been extensively mined near Springfield, andthere are still large reserves, although only one mine is operatingat present. Oil is produced from a number of fields in Devonianand Silurian rocks at depths of less than 2,000 feet. Deposits ofclay, shale, and limestone have been worked in the region.The major soils are highly productive. The greatest soillimitations are poor natural drainage and erosion.The region presents few serious problems to construction.The most common problem is the difficulty of draining relativelyflat, dense glacial deposits. Some subsidence of land surface hasoccurred in areas that have been undermined for coal. The regionis one of low risk from earthquakes.Geologic conditions are relatively favorable for solidwastedisposal by landfill throughout much of the upland and relativelyunfavorable in many of the sloping and bottomland areas .
Page 4 and 5: ILLINOIS STATE GEOLOGICAL SURVEY CI
Page 6 and 7: RIE 2 3 R 4ET185 4N171615-0 5 10 Km
Page 10 and 11: 8 ILLINOIS STATE GEOLOGICAL SURVEY
Page 18 and 19: SYSTEMSERIESGROUP OR FORMATIONTHICK
Page 28 and 29: 26 IL'LINOIS STATE GEOLOGICAL SURVE
Page 52 and 53:
ILLINOIS STATE GEOLOGI CAL SURVEY C
Page 54 and 55:
52 ILLINOIS STATE GEOLOGI CAL SURVE
Page 56 and 57:
54 ILLINOIS STATE GEOLOGI CAL SURVE
Page 58 and 59:
ILLINOIS STATE GEOLOGI CAL SURVEY C
Page 60 and 61:
APPENDIX 1 - DATA ON GROUND-WATER W
Page 62 and 63:
Appendix 1 - Continued1 1Read left1
Page 64 and 65:
Appendix 1 - ContinuedRead left sid
Page 66 and 67:
Appendix 1 - ContinuedRead left sid
Page 68 and 69:
APPENDIX 1 - ConcludedRead left 'si
Page 71 and 72:
APPENDIX 2DEFINITIONS OF ENGINEERIN
Page 73 and 74:
Major DivisionsGroupSymbolsTypicalN
Page 75 and 76:
MoistureThis Compression content Ea
Page 77 and 78:
7. Erosion is the removal of a mate
show all

Public - University of Illinois at Urbana-Champaign

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?