Late Cenozoic geomorphology of a bedrock-dominated landscape adjacent to the Laurentide glacial limit: southeastern Nebraska, USA

Joeckel, R.M.; Loope, Henry M.; Wally, K. D.; Hellerich, J. E.

doi:10.1127/0372-8854/2007/0051-0469

Cited by 5 publications

(3 citation statements)

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“…Th is pattern resulted, overall, from the deep incision of the river and its tributaries during the Pleistocene Epoch, and there is indirect evidence that the present Republican River may be older than many of the other major rivers in Nebraska (cf. Joeckel et al 2007). Locally, the pattern was infl uenced by the Cambridge Arch in the manner described previously.…”

Section: Statewide Bedrock Map: a Story In Stonementioning

confidence: 79%

Geologic Mapping of Nebraska: Old Rocks, New Maps, Fresh Insights

Joeckel¹,

Diffendal²,

Hanson³

et al. 2018

Great Plains Research

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ic maps employ scientifi c methods just as much as any endeavor in the sciences does, even though mapping is not commonly credited in this regard. What is more, geologic maps remain forms of art, so much so that they have been referred to as "the prettiest information resources" (Swoger 2013) of all. Nevertheless, for all that they are and all the insights that they can provide, geologic maps are either unknown to, or underappreciated by, most of society. Geologic maps convey information about the distribution, nature, and age relationships of Earth materials, which can be subdivided as rock and regolith, the latter being the wide range of loose or unconsolidated materials overlying intact bedrock, including heavily weathered bedrock, soils and soil parent materials, and deposits laid down by wind, water, glacial ice, and mass movements such as landslides. Geologic maps can depict either bedrock alone, regolith alone, or both simultaneously. Th ey may also depict or explain: 1. Geologic structures, such as folds, faults, and joints, among others. Indeed, several long faults have been

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Section: Statewide Bedrock Map: a Story In Stonementioning

confidence: 79%

Geologic Mapping of Nebraska: Old Rocks, New Maps, Fresh Insights

Joeckel¹,

Diffendal²,

Hanson³

et al. 2018

Great Plains Research

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“…Pleistocene buried valleys, and probably some that date entirely or in part from the Pliocene (see discussion in Joeckel et al ., ), exist under much of the glaciated Central Lowlands of the United States and Canada. Their internal heterogeneities and sedimentary architectures, however, are typically not well‐documented because subsurface data are limited and discontinuous.…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional architecture and hydrostratigraphy of cross‐cutting buried valleys using airborne electromagnetics, glaciated Central Lowlands, Nebraska, USA

et al. 2016

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Buried valleys are characteristic features of glaciated landscapes, and their deposits host important aquifers worldwide. Understanding the stratigraphic architecture of these deposits is essential for protecting groundwater and interpreting sedimentary processes in subglacial and ice-marginal environments. The relationships between depositional architecture, topography and hydrostratigraphy in dissected, pre-Illinoian till sheets is poorly understood. Boreholes alone are inadequate to characterize the complex geology of buried valleys, but airborne electromagnetic surveys have proven useful for this purpose. A key question is whether the sedimentary architecture of buried valleys can be interpreted from airborne electromagnetic profiles. This study employs airborne electromagnetic resistivity profiles to interpret the threedimensional sedimentary architecture of cross-cutting buried valleys in a ca 400 km 2 area along the western margin of Laurentide glaciation in North America. A progenitor bedrock valley is succeeded by at least five generations of tunnel valleys that become progressively younger northward. Tunnel-valley infills are highly variable, reflecting under-filled and over-filled conditions. Under-filled tunnel valleys are expressed on the modern landscape and contain fine sediments that act as hydraulic barriers. Over-filled tunnel valleys are not recognized in the modern landscape, but where they are present they form hydraulic windows between deep aquifer units and the land surface. The interpretation of tunnel-valley genesis herein provides evidence of the relationships between depositional processes and glacial landforms in a dissected, pre-Illinoian till sheet, and contributes to the understanding of the complex physical hydrology of glacial aquifers in general.

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“…Escarpment in southeastern Nebraska shows superficial bedrock deformation that some have attributed to solifluction associated with a periglacial environment (Joeckel, et al, 2007). Pingos, patterned ground, sand wedges, and asymmetrical valleys, all features forming only in permafrost environments today, have also been described in Illinois, Indiana and Ohio (Wayne, 1967).…”

Section: Cryogenic Landforms Have Also Been Documented In the Regionmentioning

confidence: 99%

Geophysical investigation of the stone zone and loamy mantle on the Iowan surface

Matzke¹

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countless individuals. Firstly and foremost, I thank my advisor, Art Bettis. Without him taking me on as a student and guiding me through this process I wouldn't be here today. I also thank the members of my committee, Frank Weirich and Adam Ward, who helped me along with both technical support and instruction. The electromagnetic and electrical resistivity portion of this thesis would have been impossible without the technical and interpretive know how offered by the Iowa DNR, Jason Vogelgesang in particular Fellow students at the University of Iowa were also of a great help. I thank Megan Schettler, for helping with GPR studies and dealing with my inane comments in our office, and Phil Kerr and Charles Beebe, for assisting me with particle size analysis and the Camsizer. Dave Campbell was invaluable in helping me process and interpret my GPR data. In addition to these two I thank all my fellow students in seminars and other classes for giving me feedback and support. Lastly I thank my family, Debbie Matzke, Dean

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Late Cenozoic geomorphology of a bedrock-dominated landscape adjacent to the Laurentide glacial limit: southeastern Nebraska, USA

Cited by 5 publications

References 0 publications

Geologic Mapping of Nebraska: Old Rocks, New Maps, Fresh Insights

Geologic Mapping of Nebraska: Old Rocks, New Maps, Fresh Insights

Three‐dimensional architecture and hydrostratigraphy of cross‐cutting buried valleys using airborne electromagnetics, glaciated Central Lowlands, Nebraska, USA

Geophysical investigation of the stone zone and loamy mantle on the Iowan surface

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