Deglacial History and Paleoenvironments of Northeastern Illinois

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* *Shore featureLake bottomGlenwood (12,700–12,000 C-14 yr BP)Calumet (11,80011,000 C-14 yr BP)Nipissing (6,000–4,000 C-14 yr BP)MoraineFigure 29 Map of Glacial Lake Chicago and its relationship with the Lake Border Moraines (after Hanseland Mickelson, 1988). The location of Figure 28 and the two dated ice-walled lake plains are shown inthe red box.38
Figure 30 Glacial and lake phases associated with GlacialLake Chicago (after Hansel and Mickelson, 1988).corresponds in time with when loessaccumulation rates slowed considerablyin shallow lakes in northeastern Illinois(discussed below).Keller Farm Phase [new](in studyarea, post-Michigan Subepisode)(20,900 to 14,670 cal yr BP). A newphase is proposed for the time whenPeoria Silt was deposited. In the timedistancediagrams of Hansel and Johnson(1992; 1996), Peoria Silt is shownto have been deposited during theMichigan Subepisode (Figure 17). Bythis definition, the material should be relatedin some fundamental way to sedimentcomprising the Wedron Formation.However, the Peoria is mineralogicallydistinct from sediment of the WedronFormation, with the former containingprimarily expandable clay minerals, andthe latter, illite and chlorite (Graese etal., 1988). The particle-size distributionis likewise distinct from depositsrepresented by the Wedron Formation;the former is primarily well-sorted siltloam to silty clay loam; the latter, matrixsupporteddiamicton (Table 1). Masonet al. (2007) show that the Peoria Silt ineastern Nebraska is partly, if not mostly,derived from non-glacial alluvium derivedfrom bedrock occurring in the HighPlains. Hence, there are neither compositionalnor textural, and in at least easternNebraska, genetic reasons to havethe Michigan Subepisode embrace thePeoria Silt as a material referent.The well-dated section at Keller Farm,Illinois (Wang et al., 2003) is suggested for the material referent section for the Keller FarmPhase. In northeastern Illinois, data from core BC-1 at Brewster Creek is a proposed paratypesection (Curry et al., 2007). In this core, the lower boundary is marked by a change in lithologyfrom glacigenic diamicton or outwash below to sorted, silt-rich sediment above. In depressionsand on some slopes, the upper boundary is marked by silty, terriginous sediment below, andbiogenic marl and peat above (Figure 31). The terriginous-poor material was deposited duringthe Hudson Episode, discussed below. Several radiocarbon ages of spruce needles pickedfrom of the contact at the Brewster Creek site indicates that the change in lithology occurred at14,670 cal yr BP (ca. 12,500 C-14 yr BP; Figure 31; Curry et al., 2007). The upper boundary isground surface in most upland situations.39
Page 1 and 2: State of IllinoisRod. R. Blagojevic
Page 3: Deglacial History and Paleoenvironm
Page 6 and 7: AcknowledgementsBrandon is grateful
Page 8 and 9: WINNEBAGOOGLEMarengo MoraineWoodsto
Page 10 and 11: Figure 3 Projected growth areas in
Page 12 and 13: Surficial fine-textured layerTiskil
Page 14 and 15: samples, especially diamict units.
Page 16 and 17: OaOgSuWINNEBAGOOgBOONE MCHENRY LAKE
Page 18 and 19: Bedrock valley floor changes in Kan
Page 20 and 21: illite peak (8.8°2) with thecompou
Page 22 and 23: Grayslake Peat (gr)Peoria Silt (not
Page 24 and 25: DEPOSITS OF THE LAST GLACIATIONMaso
Page 26 and 27: WisconsinCheck here ifH homestead c
Page 28 and 29: Table 1 Summary of particle size of
Page 30 and 31: Table 2 Selected physical propertie
Page 32 and 33: l-h0 counts per second50Diamicton,b
Page 34 and 35: Geochronologicand Chronostratigraph
Page 36 and 37: Wisconsin EpisodeAthens Subepisode
Page 38 and 39: MarengoPhaseMarengo MoraineHarvardS
Page 40: Three erosional channels cut across
Page 43: Boring WAD-05-02Tinley Moraine*DesP
Page 47 and 48: were not intended to overlap (North
Page 49: West Chicago Moraine,9c Higgins/Sut
Page 52 and 53: Benn D.I., 2002, Clast fabric devel
Page 54 and 55: Curry, B.B. 2003. Linking Ostracode
Page 56 and 57: Eyles, N. 1983. Glacial Geology: An
Page 58 and 59: Hajic, E.R., 1990. Late Pleistocene
Page 60 and 61: Johnson, W. H., A. K. Hansel, E. A.
Page 62 and 63: Leighton, M.M., P. MacClintock, L.E
Page 64 and 65: Piskin, K., and R. E. Bergstrom, 19
Page 66 and 67: Vagt, P. J., 1987. Characterization
Page 68 and 69: STOP 1: Buffalo Rock State ParkLarg
Page 70 and 71: ner channel began. Previously, thes
Page 72 and 73: Figure 3 (A) Example of outer erosi
Page 74 and 75: Stop 2a: Wedron Silica Company Quar
Page 76 and 77: N N N0.0W20.5W1W3Depth (m)1.01.5Rin
Page 78 and 79: 0.00.2W3W2W1W1W3W2Ringshearresult0.
Page 80 and 81: to the arrival of the last glaciers
Page 82 and 83: Sedimentology and stratigraphyThe c
Page 84 and 85: prairie-like. Pollen analyses may b
Page 86 and 87: CarboniferousFigure 1 Carboniferous
Page 88 and 89: Figure 3 Largest and best preserved
Page 90 and 91: Figure 6 Small normal faults in lam
Page 92 and 93: and mineralogy, we propose that the
Page 94 and 95:
Stop 4: Oswego ChannelThe 15,770 C-
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NewarkMarseillesIroquoisSt. AnneOsw
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Joliet sublobe;retreat to theValpar
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Sediment coresSeveral sediment core
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formed during the late Livingston P
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are being examined by Professor L.
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assistant secretary of the Smithson
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Annotated Illustrated Guide to the
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Figure 4 The BrewsterCreek mastodon
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Figure 6 The left lower 3rd molar o
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Figure 8 The left upper 3rd molar o
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Figure 10 This slide elaborates on
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Aurora Mastodont Project 2004 - A s
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a full skeleton still buried. Ed Mo
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Figure 17 Field leader Anita Weber
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Figure 18 Paleontologist For A Day
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paleontologist/geologist/archeologi
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scientific rationale behind the see
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tures exposed, from well drained in
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N1 km1 miAA’lbgphhwheA1380 lbFelt
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Table 1 Soil horizonation and depth
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Figure 5 Morphological measure of t
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vial upper solum characteristics, d
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material indicates long term disper
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(Table 1). Sand and silt values oft
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STOP 7: DeKalb moundsArchives of de
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acA A ‘*"e H-2278bde(x)1 kmFigure
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1 kmFigure 4 Typical distribution a
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Vertical exaggeration =20x5 mB-9AWe
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Valve concentration(#/gm, moist)0.0
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200-8Value (‰)-6 -4 -2 0 2 0.00 0
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sions encompass the period of final
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Stop 8: Spring Lake Sand and Gravel
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Stratigraphy and Mechanical Stratig
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ABCDEFFigure 3 Characteristic defor
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a.b.C90 mC'WED85 mD'c.D200 mD'NSd.D
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a.b.c.d. e.LHudSTATION E1 E2 E3LHld
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In the weaker units, several charac
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Stop 9: Thelen Sand and Gravel Pits
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Table 1 Lithofacies code for fluvia
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The erosion of the large semi-circu
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Topset sequences are composed of bo
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APPENDIX A. Description of Profile
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pinches out laterally.4 879.6 10.5
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Deglacial History and Paleoenvironments of Northeastern Illinois

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