Examining Local Climate Variability in the Late Pennsylvanian Through Paleosols: An Example from the Lower Conemaugh Group of Southeastern Ohio, USA

Dzenowski, Nicole D.; Hembree, Daniel I.

doi:10.3390/geosciences2040260

Cited by 7 publications

(6 citation statements)

References 32 publications

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“…Paleosols at Site 1 were interpreted to be a stacked succession of profiles, and exhibited some overprinting (Dzenowski and Hembree 2012). The presence of vertic features including illuviated clay skins, slickensides, and desiccation cracks in conjunction with carbonate nodules support the classification of the lower paleosol as a calcic paleoVertisol.…”

Section: Glenshaw Formationmentioning

confidence: 80%

“…The composite nature of the overall profile suggests that sedimentation and bioturbation rates remained consistent and that changes in climate resulted in the formation of a second profile in the upper portion (Dzenowski and Hembree 2012). This portion was classified as a vertic Gleysol and interpreted as a paleoInceptisol (Dzenowski and Hembree 2012).…”

Section: Glenshaw Formationmentioning

confidence: 96%

“…Others mention trenching to reduce or remove upslope slump and vegetative cover, but do not go into detail (King 2008;Catena and Hembree 2012). Rosenau et al (Dzenowski and Hembree 2012). Paleosols in Driese and Ober (2005)'s study exhibited substantial lateral variability which was attributed to differences in drainage conditions associated with gilgai microrelief in modern Vertisols.…”

Section: Outcrop Agementioning

confidence: 99%

“…The well-developed nature of the profile and prominent vertic features suggests that this paleosol was formed on the distal portions of an alluvial floodplain in a seasonally wet climate (Table 3) (Aslan and Austin 1998;Hembree and Nadon 2011). The composite nature of the overall profile suggests that sedimentation and bioturbation rates remained consistent and that changes in climate resulted in the formation of a second profile in the upper portion (Dzenowski and Hembree 2012). This portion was classified as a vertic Gleysol and interpreted as a paleoInceptisol (Dzenowski and Hembree 2012).…”

Section: Glenshaw Formationmentioning

confidence: 99%

“…Roadcut age is approximately 50 years. Paleosols excavated 25 to 50 cm into the outcrop at Site 1 were blocky, strongly horizonated mudstones, with overthickened B horizons containing angular blocky peds, slickensides on ped faces, and cutans (Dzenowski and Hembree 2012). Color ranged from dark red and reddish brown in the lower section and from grey-green to olive green in the upper portions, with a variegated gradational contact between unit (Hembree and Nadon 2011;…”

Section: Glenshaw Formationmentioning

confidence: 99%

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Influences of Modern Pedogenesis on Paleoclimate Estimates From Pennsylvanian and Permian Paleosols, Southeast Ohio

Kogler¹,

Hembree²

2017

Geological Society of America Abstracts With Programs

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Exposed paleosols are subject to modern pedogenic processes which, over time, are expected to alter paleosol chemistry and subsequent paleoclimate estimates to better reflect the environment at the time of exposure rather than the time of formation. Although paleosols are widely used in paleoclimatic reconstruction, current research typically does not address the degree of influence that modern weathering has on the bulk geochemistry of paleosols. Previously described Pennsylvanian and Permian paleoVertisols and paleoInceptisols with known durations of exposure were described and sampled from five roadcuts in southeastern, Ohio. Samples were collected at depths of 0, 25, 50, 100, and 150 cm from the outcrop surface, and then analyzed via XRF for major oxides (Ca, Fe, K, Mg, Na, Al, Si, Mn, P, and Ti). These data were used in molecular weathering ratios to characterize paleosol properties and calculate MAP and MAT. Results indicate that although oxide geochemistry often differs between sampling depths, the differences do not occur in a pattern that supports that recent pedogenesis is a driving factor. Rather, this study may be capturing naturally occurring geochemical variations that are the result of small-scale differences in formational environment. Additionally, decade-level exposure time along these roadcuts may limit the extent of pedogenesis. Ultimately, for geochemical studies on paleosols in outcrops located on young roadcuts in ACKNOWLEDGMENTS First, I need to thank my adviser, Daniel Hembree, for forcing me to consistently meet his expectations and live up to my potential through a combination of encouragement, patience, and pressure. I would like to thank my committee members, Gregory Springer, Alycia Stigall, and Craig Grimes, for providing a secondary source of guidance and expertise. Many thanks to my field assistants, Alexander Hartman and Kelsey McGuire, who were willing to dig holes for money, and Emma Swaninger, who was willing to dig holes for free. Without you I would probably still be on a roadcut. I would like to thank Rob Michitsch at the University of Wisconsin-Stevens Point, if we never met, this thesis would probably have been about deer. Finally, I would like to thank my friends and family for their unwavering support, particularly my fiancé, Bradley Kuehn, who sacrificed both his career and his computer to further my education. I would also like to thank the following funding sources that made this project possible: the

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Section: Glenshaw Formationmentioning

confidence: 80%

Section: Glenshaw Formationmentioning

confidence: 96%