Sangamon arch

Journal Article · Fri Jan 01 04:00:00 EST 1965 · Ill. State Geol. Surv., Circ.; (United States)

OSTI ID:6650540

Whiting, L L; Stevenson, D L

Thickness and areal extent of Devonian and Silurian carbonates in central and western Illinois were influenced by a major upwarp that was active during Devonian and early Mississippian time. The movement probably began in late Silurian time, but initial uplift cannot be determined because of extensive erosion of Silurian strata. The upwarp has been named the Sangamon arch. Although the structure persisted for some time after middle Devonian deposition, later movement has masked the arch so that it does not show on structure maps of the top of the Galena group or of the top of the Hunton mega-group (Devonian-Silurian). The Sangamon arch appears to have had much influence on the stratigraphic and geographic position of all the various types of Silurian and Devonian petroleum reservoirs in this area, with the possible exception of the reefs. Because of this influence, the Sangamon arch should be considered in future oil exploration.

• OSTI ID: 6650540
• Journal Information: Ill. State Geol. Surv., Circ.; (United States), Journal Name: Ill. State Geol. Surv., Circ.; (United States) Vol. 383; ISSN ILGCA
• Country of Publication: United States
• Language: English

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