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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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North America
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Basin and Range Province (1)
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Great Lakes
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Lake Michigan (1)
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Great Lakes region (2)
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United States
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California (1)
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Indiana
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Lagrange County Indiana (1)
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Michigan
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Michigan Lower Peninsula
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Allegan County Michigan (1)
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Barry County Michigan (1)
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Calhoun County Michigan (1)
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Kalamazoo County Michigan (1)
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Van Buren County Michigan (1)
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Nevada
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Carson City County Nevada (2)
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Ohio
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Lucas County Ohio (1)
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Wisconsin
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Sauk County Wisconsin
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Baraboo Wisconsin (1)
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elements, isotopes
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carbon
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C-14 (3)
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isotopes
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radioactive isotopes
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C-14 (3)
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fossils
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Plantae
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Spermatophyta
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Angiospermae
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Dicotyledoneae
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Dryas (1)
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geochronology methods
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infrared stimulated luminescence (1)
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optically stimulated luminescence (3)
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geologic age
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Cenozoic
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Quaternary
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Holocene
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upper Holocene (1)
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Pleistocene
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upper Pleistocene
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Weichselian
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upper Weichselian
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Younger Dryas (1)
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Wisconsinan (1)
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Laurentide ice sheet (3)
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Primary terms
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absolute age (1)
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carbon
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C-14 (3)
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Cenozoic
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Quaternary
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Holocene
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upper Holocene (1)
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Pleistocene
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upper Pleistocene
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Weichselian
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upper Weichselian
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Younger Dryas (1)
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Wisconsinan (1)
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clay mineralogy (1)
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deformation (1)
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earthquakes (2)
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faults (2)
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geochronology (3)
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geomorphology (1)
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geophysical methods (1)
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glacial geology (2)
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isotopes
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radioactive isotopes
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C-14 (3)
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North America
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Basin and Range Province (1)
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Great Lakes
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Lake Michigan (1)
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Great Lakes region (2)
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paleoclimatology (1)
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petrology (1)
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Plantae
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Spermatophyta
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Angiospermae
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Dicotyledoneae
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Dryas (1)
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sedimentation (2)
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sediments
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clastic sediments
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diamicton (1)
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drift (1)
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till (1)
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stratigraphy (1)
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United States
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California (1)
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Indiana
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Lagrange County Indiana (1)
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Michigan
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Michigan Lower Peninsula
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Allegan County Michigan (1)
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Barry County Michigan (1)
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Calhoun County Michigan (1)
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Kalamazoo County Michigan (1)
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Van Buren County Michigan (1)
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Nevada
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Carson City County Nevada (2)
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Ohio
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Lucas County Ohio (1)
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Wisconsin
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Sauk County Wisconsin
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Baraboo Wisconsin (1)
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sediments
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sediments
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clastic sediments
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diamicton (1)
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drift (1)
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till (1)
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Sturgis Moraine
Location of the Pigeon River meltwater channel south of the Sturgis Moraine...
ABSTRACT Lobes, or ice streams, of the southern Laurentide ice sheet readvanced periodically during their overall retreat after the Last Glacial Maximum in the Great Lakes region. The Saginaw Lobe readvanced around 20 ka to form a prominent moraine, the Sturgis moraine, near the Michigan-Indiana border. Detailed mapping of nineteen 7½ min quadrangles at a scale of 1:24,000 in and adjacent to Calhoun County, Michigan, supports the interpretation that a large drumlin field behind the moraine was formed at this time, when the basal drainage of the glacier was distributed with high basal pore pressure. During retreat, after moraine construction, the drainage mode switched to a conduit-type system, in which meltwater drained to recessional ice-marginal positions through tunnel valleys. We mapped at least three discontinuous ice-marginal positions on the basis of coarse-grained, subaerial fans beginning at the ends of the tunnel valleys. There is a close association of kames with the tunnel valleys at these locations, suggesting that supraglacial meltwater contributed to the subglacial drainage. Our results support a model in which the drumlins were produced by deformation of the basal diamicton during ice advance prior to the formation of the tunnel valleys during ice retreat. This hypothesis rebuts a previously proposed model for this area in which the drumlins and tunnel valleys, along with boulder gravel deposits, were attributed to formation during a single, catastrophic subglacial sheetflood.
Aeolian activity during Late Glacial time, with an example from Mongo, Indiana, USA
Late Wisconsinan drift stratigraphy of the Lake Michigan Lobe in southwestern Michigan
Deglacial Kankakee Torrent, source to sink
ABSTRACT The last-glacial megaflood Kankakee Torrent streamlined hills and the remarkably straight backslope of the Kalamazoo moraine (Lake Michigan lobe of the Laurentide ice sheet) in southwestern Michigan. Flooding ensued as proglacial Lake Dowagiac overflowed across remnants of the Lake Michigan lobe at the position of the inner margin of the Kalamazoo moraine as glacial debris and ablating ice were pinned against Portage Prairie. Proglacial Lake Dowagiac developed in the Dowagiac River valley as the lobe retreated to form the Valparaiso moraine. A minimum age of the Kankakee Torrent (18.7 ± 0.6 k.y. B.P) is indicated by the weighted mean value of six optically stimulated luminescence ages determined from quartz sand in glaciofluvial sediment on the Kalamazoo moraine (Lake Michigan and Saginaw lobes). This value is consistent with tighter age control based on radiocarbon ages of tundra plants within silty sediment forming ice-walled lake plains and in a torrent-scoured lake basin (Oswego channel) in Illinois. Crosscutting relationships of well-dated moraines indicate the Kankakee Torrent occurred sometime between 19.7 and 18.9 calibrated (cal.) k.y. B.P. as it skirted the south margin of the Valparaiso Morainic System.
Large-magnitude, late Holocene earthquakes on the Genoa fault, west-central Nevada and eastern California
Contrasting terrains of the Lake Michigan and Saginaw lobes of the Laurentide Ice Sheet in southern Michigan
ABSTRACT Recent mapping in southwestern Michigan conducted through U.S. Geological Survey STATEMAP, EDMAP, and Great Lakes Geologic Mapping Coalition projects has produced new interpretations of the origin of the landforms and sediments of the Lake Michigan and Saginaw lobes of the Laurentide Ice Sheet and the dynamics of these lobes. The Lake Michigan lobe advanced southeastward into a proglacial lake at least as far east as the Kalamazoo moraine. During its advance, the lobe extensively deformed the lacustrine sediments it overrode. These structures will be discussed in several pits. When ice backed away from the Kalamazoo moraine, it formed a series of proglacial lakes, several of which were described for the first time in the studies upon which this guidebook is based. As the ice retreated, lowland areas between morainal uplands were utilized by meltwater drainage events, some of them probably catastrophic in nature. The Saginaw lobe stagnated over a broad marginal area as it retreated northeastward toward Saginaw Bay. The resulting stagnant marginal zone is coincident with the subcrop of the Marshall Sandstone. Enhanced basal drainage into the underlying sandstone may have played a role in the dynamics of the lobe. High-relief, supraglacial landforms such as hummocky topography and ice-walled lake plains overprint subglacial landforms in this region, which include large tunnel valleys with inset eskers. Better understanding of the glacial geology of this region is critical to economic development, management of water resources, and exploration for aggregates and other resources.
Testing the Synchronicity of Splay‐Fault Ruptures in Carson Valley, Nevada, United States
Stratigraphic and chronologic analysis of the Warren Beach, northwest Ohio, USA
28th DeBeers Alex. Du Toit Memorial Lecture, 2004. On Cryogenian (Neoproterozoic) ice-sheet dynamics and the limitations of the glacial sedimentary record
Abstract This road log is different than most in a variety of ways. It is similar in that the stops are numbered in a certain order. That is because each stop must have some identification and numbers are the simplest and easiest to follow. Mileage is provided between stops, not in a cumulative fashion. This makes it easy to arrange the stops to suit the specific leader(s) and students. Those who use this field guide can choose to visit the stops in any order that they wish. The complete trip is designed to take two full field days, but stops can be visited in any fashion that suits the wishes and schedule of the group. There are a few alternate stops that may be used in addition to or in lieu of some of the regular stops. The estimated time necessary to spend at each stop is indicated in the log to help in organizing your trip. The total estimated time of the combined stops is ~12–14 hours. This does not include any travel time or lunch stops so that leaders can develop their own plans. Unless indicated in the figure caption, all figures herein are those of the co-authors. The trip starts at the intersection of Wisconsin Highway 33 with Interstates I-90 and I-94 (Appendix Figure A1.) Enjoy!