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southwestern Illinois

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Journal Article
Journal: AAPG Bulletin
Published: 01 October 1944
AAPG Bulletin (1944) 28 (10): 1528-1534.
Journal Article
Published: 01 January 1999
Environmental and Engineering Geoscience (1999) V (2): 133-146.
...WILLIAM E. MCNULTY; STEPHEN F. OBERMEIER Abstract Two strong mid-Holocene earthquakes in Illinois have been documented by paleoliquefaction features such as clastic dikes, sills, and detachments of fine-grained sediment that sunk into liquefied sand. At least one paleo-earthquake occurred...
Series: AAPG Studies in Geology
Published: 01 January 1993
DOI: 10.1306/St35571C9
EISBN: 9781629811017
... Chesterian carbonate units in the Illinois basin containing abundant ooids. Oolitic limestone is common along the western, southern, and eastern margins of the basin. Elsewhere, oolitic deposits are more sporadic and thin. The presence of a positive area (i.e., the Ozark dome) in Missouri induced conditions...
Journal Article
Journal: AAPG Bulletin
Published: 01 August 1961
AAPG Bulletin (1961) 45 (8): 1401-1405.
...George A. Desborough Abstract Both Pre-Pennsylvanian and post-Pennsylvanian faulting have been recognized along the N. side of the Rattlesnake Ferry fault in southwestern Illinois. Minor faults which displace Chester strata and are overlain by essentially flat Caseyville beds are considered...
Journal Article
Published: 01 November 1960
Journal of Paleontology (1960) 34 (6): 1153-1157.
...James Watson Baxter Abstract Thin sections of the Salem limestone from outcrops in the Mississippi River bluffs in southwestern Illinois contain tiny, calcareous spheres which are prominent elements in certain types of limestone. These microorganisms are referable to the genus Calcisphaera...
Journal Article
Journal: AAPG Bulletin
Published: 01 November 1959
AAPG Bulletin (1959) 43 (11): 2720-2724.
...George A. Desborough Abstract The stratigraphic terminology of the Pennsylvanian of southwestern Illinois is reviewed. The Boskydell sandstone lies above the Pounds sandstone ( = lower massive Makanda) but not above the Grindstaff sandstone, and therefore below the Willis coal. The Boskydell...
Journal Article
Published: 01 August 2009
Bulletin of the Seismological Society of America (2009) 99 (4): 2147-2154.
... in late-Wisconsin to Holocene-age, near surface sediments (liquefaction, monoclinal folding, and changes in river meanders). In this article, we show that speleothems in caves of southwestern Illinois and southeastern Missouri may constitute a previously unrecognized recorder of large earthquakes...
FIGURES
Journal Article
Journal: GSA Bulletin
Published: 15 August 2018
GSA Bulletin (2018) 131 (1-2): 335-352.
...Neo E.B. McAdams; Bradley D. Cramer; Alyssa M. Bancroft; Michael J. Melchin; Joseph A. Devera; James E. Day Abstract The Illinois Basin of southwestern Illinois and southeastern Missouri contains one of the most extensive Silurian records in North America and is a potentially critical area...
FIGURES | View All (10)
Series: GSA Special Papers
Published: 30 January 2018
DOI: 10.1130/2017.2530(01)
EISBN: 9780813795300
... Illinois, along with southeastern Iowa and southwestern Indiana, that have Illinois Episode landforms and deposits near the surface; Pleistocene glacial boundaries adapted from Fullerton et al. (2003) . Arrows show generalized glacial flow directions from an ancestral Illinois Episode Lake Michigan Lobe...
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Journal Article
Published: 01 November 2012
Seismological Research Letters (2012) 83 (6): 1090-1103.
..., but the bulk of the recordings is associated with the 1987 M 4.96 and 2008 M 5.2 southeastern Illinois earthquakes, and the 2002 M 4.5 southwestern Indiana earthquake. We summarize the velocity recordings and site investigations for the 2008 southeastern Illinois earthquake sequence, put the findings...
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Journal Article
Journal: AAPG Bulletin
Published: 01 April 1961
AAPG Bulletin (1961) 45 (4): 471-483.
... dolomite megagroup of Cambrian and Ordovician age is in part contemporaneous with the Potsdam and extends from the base of the St. Peter sandstone down only to the base of the Potosi dolomite in northern Illinois but to the base of the Bonneterre dolomite in southwestern Illinois. The Ottawa limestone...
Journal Article
Journal: GSA Bulletin
Published: 01 December 1939
GSA Bulletin (1939) 50 (12_2): 1995-2015.
... fall into several categories as to mode of origin, including morainic, interlobate, and glacio-fluvial, but some hills which simulate the elongate drifthills are of eroded bedrock. Salient features of common occurrence in these hills have instigated recent field studies in southwestern Illinois...
Series: GSA Special Papers
Published: 01 January 2013
DOI: 10.1130/2012.2493(07)
Journal Article
Journal: Geology
Published: 01 December 2010
Geology (2010) 38 (12): 1091-1094.
... grass-pollen grains preserved in eight samples of lacustrine and shallow-marine sediments from three basins spanning the Early Oligocene to Middle Miocene in southwestern Europe. Grasses composed <15% of the total abundance of terrestrial pollen grains, and 26%–62% of the grass pollen was from C 4...
FIGURES
Series: GSA Special Papers
Published: 01 January 1993
DOI: 10.1130/SPE283-p67
... to investigate both broad- and small-scale archaeological phenomena and the problems and prospects of such research are illustrated with data from the Cahokia Mounds State Historic Site in southwestern Illinois. ...
Journal Article
Journal: Geophysics
Published: 01 August 1991
Geophysics (1991) 56 (8): 1280-1287.
...Rinita A. Dalan Abstract Electromagnetic (EM) surveys have been used at the Cahokia Mounds State Historic Site in southwestern Illinois to locate and define a number of buried archaeological features. Two instruments, Geonics EM31-D and EM38 conductivity meters, were employed to locate portions...
Journal Article
Journal: GSA Bulletin
Published: 01 May 1963
GSA Bulletin (1963) 74 (5): 631-636.
...: Henryhouse Formation and Clarita, Cochrane, and Keel-Ideal Quarry members of the Chimneyhill Formation. The unconformable relationship of the Keel, Cochrane, and Clarita is well shown in this outcrop. These units are correlated with Silurian strata in southwestern Illinois and southeastern Missouri...
Journal Article
Published: 01 July 2010
Seismological Research Letters (2010) 81 (4): 577-591.
... by a minimal reef, 8 km northeast of Niuatoputapu. Expectedly, inundations distances were shorter, but run-up reached impressive values, typically 10–15 m along most of the island, with a maximum of 22.4 m measured on the southwestern coast, in the lee of the incoming tsunami, this geometry being reminiscent...
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Series: AAPG Studies in Geology
Published: 01 January 1984
DOI: 10.1306/St17437C5
EISBN: 9781629811635
... Abstract The Illinois Basin is a broad, spoon-shaped structural depression encompassing approximately 53,000 sq mi in Illinois, southwestern Indiana, and western Kentucky. The U.S. Geological Survey has estimated the bituminous coal reserves in Pennsylvanian rocks to be as much as 365 billion...
Journal Article
Journal: Geology
Published: 12 June 2018
Geology (2018) 46 (7): 667-670.
... of riverine terraces, and coeval decreases in Gulf of Mexico stable oxygen isotope ratios. South of Illinois, physical and temporal evidence of high discharge at ca. 15.1 cal. kyr B.P. includes evidence of lateral migration of the Mississippi River from the Kennett to Blodgett braid belt ( Rittenour et al...
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