02394nas a2200145 4500008004100000022001800041245008100059210006900140260005300209520179500262100001302057700001802070700002202088856013802110 2018 eng d a978081379530000aGlaciotectonic deformation along the Valparaiso Upland in southwest Michigan0 aGlaciotectonic deformation along the Valparaiso Upland in southw aBoulder, ColoradobGeological Society of America3 a
Glaciotectonic deformation of glacigenic deposits in southwestern Michigan is described and analyzed to determine the source of stress of these strained sediments, which manifests as overturned folds and other deformation similar to shallow crustal décollements. The succession is exposed in 11 aggregate mining operations along the Valparaiso Upland, in portions of Berrien, Van Buren, and Allegan Counties in southwest Michigan. Observed deformation includes a complex array of folds, faults, and thrust features as much as 5 m below the surface exposure of the pit face, consistent with horizontal compressional stresses that were generally aligned with ice flow. Fabric measurement of elongated clasts in the surficial till indicates ice flow from northwest to southeast across the area and parallel to drumlins in the area. Stratigraphically, the area is dominated by fine, lacustrine deposits with coarse sand and gravel capped by the Saugatuck Till during the last glaciation. Sediment grain size, pore-water pressure fluctuations, and topographic relief are interpreted to be responsible for the deformation observed as the Lake Michigan Lobe overrode a proglacial lake basin, including fans and deltas, as it advanced eastward to the Kalamazoo moraine. The fine texture and fabric of the lacustrine sediment package restricted the flow of subglacial water and caused abrupt local increases of pore-water pressure and concomitant coupling and decoupling of the bed-substrate interface. Advancing ice deformed sediments in two stages: (1) proglacially along a décollement at the ice margin, and then (2) subglacially as ice overrode the sediments.
1 aBird, B.1 aKehew, A., E.1 aKozlowski, A., L. uhttps://pubs.geoscienceworld.org/books/book/2055/chapter/113619031/glaciotectonic-deformation-along-the-valparaiso?redirectedFrom=PDF00538nas a2200157 4500008004100000020002200041022001700063245008700080210006900167250000700236260004400243100001300287700002200300700001700322856004100339 2017 eng d a978-1-55557-318-8 a155557-318-500aSurficial Geology of the Owasco Quadrangle, Cayuga and Onondaga Counties, New York0 aSurficial Geology of the Owasco Quadrangle Cayuga and Onondaga C a96 aAlbany, New YorkbNew York State Museum1 aBird, B.1 aKozlowski, A., L.1 aPair, D., L. uhttp://www.nysm.nysed.gov/file/4477/00459nas a2200121 4500008004100000022002200041245008500063210006900148260004400217100001300261700002200274856004100296 2016 eng d a978-1-55557-348-500aLate Quaternary Reconstruction of Lake Iroquois in the Ontario Basin of New York0 aLate Quaternary Reconstruction of Lake Iroquois in the Ontario B aAlbany, New YorkbNew York State Museum1 aBird, B.1 aKozlowski, A., L. uhttp://www.nysm.nysed.gov/file/2851/00447nas a2200121 4500008004100000022002200041245007300063210006900136260004400205100001300249700002200262856004100284 2016 eng d a978-1-55557-337-900aSurficial Geology of the Moravia Quadrangle, Cayuga County, New York0 aSurficial Geology of the Moravia Quadrangle Cayuga County New Yo aAlbany, New YorkbNew York State Museum1 aBird, B.1 aKozlowski, A., L. uhttp://www.nysm.nysed.gov/file/4548/00450nas a2200121 4500008004100000022002200041245007600063210006900139260004400208100001300252700002200265856004100287 2016 eng d a978-1-55557-338-600aSurficial Geology of the Sempronius Quadrangle, Cayuga County, New York0 aSurficial Geology of the Sempronius Quadrangle Cayuga County New aAlbany, New YorkbNew York State Museum1 aBird, B.1 aKozlowski, A., L. uhttp://www.nysm.nysed.gov/file/4500/00446nas a2200121 4500008004100000022002200041245007200063210006900135260004400204100001300248700002200261856004100283 2015 eng d a978-1-55557-326-300aSurficial Geology of the Auburn Quadrangle, Cayuga County, New York0 aSurficial Geology of the Auburn Quadrangle Cayuga County New Yor aAlbany, New YorkbNew York State Museum1 aBird, B.1 aKozlowski, A., L. uhttp://www.nysm.nysed.gov/file/4485/00460nas a2200121 4500008004100000022002200041245008600063210006900149260004400218100001300262700002200275856004100297 2015 eng d a978-1-55557-328-700aSurficial Geology of the Fair Haven Quadrangle, Cayuga and Wayne County, New York0 aSurficial Geology of the Fair Haven Quadrangle Cayuga and Wayne aAlbany, New YorkbNew York State Museum1 aBird, B.1 aKozlowski, A., L. uhttp://www.nysm.nysed.gov/file/4496/00449nas a2200121 4500008004100000022002200041245007500063210006900138260004400207100001300251700002200264856004100286 2015 eng d a978-1-55557-329-400aSurficial Geology of the Weedsport Quadrangle, Cayuga County, New York0 aSurficial Geology of the Weedsport Quadrangle Cayuga County New aAlbany, New YorkbNew York State Museum1 aBird, B.1 aKozlowski, A., L. uhttp://www.nysm.nysed.gov/file/4498/00443nas a2200121 4500008004100000022002200041245007000063210006800133260004400201100001300245700002200258856004100280 2014 eng d a978-1-55557-282-200aSurficial Geology of the Lyons Quadrangle, Wayne County, New York0 aSurficial Geology of the Lyons Quadrangle Wayne County New York aAlbany, New YorkbNew York State Museum1 aBird, B.1 aKozlowski, A., L. uhttp://www.nysm.nysed.gov/file/4452/00439nas a2200133 4500008004100000022002200041245005800063210005700121250000700178260004400185100001300229700002200242856004100264 2011 eng d a978-1-55557-339-300aSurficial Geology of the Victory Quadrangle, New York0 aSurficial Geology of the Victory Quadrangle New York a76 aAlbany, New YorkbNew York State Museum1 aBird, B.1 aKozlowski, A., L. uhttp://www.nysm.nysed.gov/file/4459/00449nas a2200133 4500008004100000022002200041245006300063210006200126250000700188260004400195100001300239700002200252856004100274 2010 eng d a978-1-55557-317-100aSurficial Geology of the Seneca Falls Quadrangle, New York0 aSurficial Geology of the Seneca Falls Quadrangle New York a69 aAlbany, New YorkbNew York State Museum1 aBird, B.1 aKozlowski, A., L. uhttp://www.nysm.nysed.gov/file/2833/