Dr. Jill Marshall
Assistant Professor of Geology
Ph.D. University of Oregon, Geosciences, 2015
M.S. San Francisco State University, Geosciences, 2009
B.S. California State University Hayward, Earth and Environmental Sciences, 1994
Dr. Marshall is a geomorphologist and Critical Zone scientist. The Critical Zone is the life-sustaining, constantly evolving, surface and near-surface earth region extending from the top of the vegetative canopy where it intersects with the atmosphere to the subsurface limit of groundwater.
Her research delves deeply into the role of biota, climate and lithology (or more specifically rock properties) in determining the rates and styles of geomorphic processes through time. Broadly, her current work centers on two overlapping themes: 1) how variations in rock properties and climate-mediated changes in processes (such as bedrock weathering via trees vs. frost) control the rates and style of landscape evolution and 2) dis-entangling the legacy of Pleistocene glacial intervals in regions that remained unglaciated during cold intervals. She has a particular interest in how past processes shape modern sub-surface architecture (e.g. fracturing and porosity) of the Critical Zone as the physical architecture supports diverse functions such as hydrologic routing, net primary productivity, carbon and water storage, and mineral supplies for the geochemical reactor.
|Applied Environmental Geoscience||
Before returning to school for her PhD, Dr. Marshall worked for several decades on applied problems in water quality, with a focus on watershed and stream studies, and restoration design. As a stream specialist for the State of California, she pioneered the development of stream protection policies, developed stream monitoring and restoration trainings for both urban and rural communities, led studies on mercury transport in rivers, designed effective mercury containment projects at an abandoned mercury mine and developed water quality standards to protect fish-eating birds and humans from ill health effects due to eating mercury- contaminated fish. She is looking forward to learning more about the wonderful Arkansas waterways and exploring feedbacks between geomorphic processes and aquatic ecosystems.
Brantley, S.L., D.M. Eissenstat, J.A. Marshall, S.E. Godsey, Z. Balogh-Brunstad, D.L. Karwan, S.A. Papuga, J. Roering, T.E. Dawson, J. Evaristo, O. Chadwick, J.J. McDonnell, and K.C. Weathers, (2017), On the roles trees play in building and plumbing the Critical Zone, Biogeosciences, doi:10.5194/bg-2017-61.
Wymore, A. S., N. R. West, K. Maher, P. L. Sullivan, A. Harpold, D. Karwan, J. A. Marshall, J. Perdrial, D. M. Rempe and L. Ma, (2017), Growing New Generations of International Critical Zone Scientists, Earth Surface Processes and Landforms.
Marshall, J.A., J.J. Roering, D. Granger, and D.G. Gavin, (2017), Late Pleistocene climate controls on erosion in western Oregon, Geological Society of America Bulletin, doi: 10.1130/B31509.1.
Rempel, A.W., J.A. Marshall, and J.J. Roering, (2016), Modeling relative frost weathering rates at geomorphic scales, Earth and Planetary Science Letters, doi:10.1016/j.epsl.2016.08.019.
Sklar, L.S., C.S Riebe, J.A. Marshall, J. Genetti, S. Leclere, C.L. Lukens, V. Merces, (2016), The problem of predicting the particle size distribution of sediment supplied by hillslopes to rivers, Geomorphology, 2016 Binghamton Symposium, “Connectivity in Geomorphology”, doi: 10.1016/j.geomorph.2016.05.005
Marshall, J.A., J.J. Roering, P.J. Bartlein, D.G. Gavin, D.E. Granger, A.W. Rempel, S. Praskievicz, T.C. Hales, (2015), Seeing frost for the trees: Did climate increase erosion in unglaciated landscapes during the Late Pleistocene? Science Advances, doi: 10.1126/sciadv.1500715
Harpold, A.A., J.A. Marshall, S.W. Lyon, T.B. Barnhart, B.A. Fisher, M. Donovan, K. M. Brubaker, . . . N. West. (2015) Laser vision: lidar as a transformative tool to advance critical zone science: Hydrology and Earth System Sciences, v. 19, p. 2881–2897, doi: 10.5194/hess-19-2881-2015.
Marshall, J.A., and J.J. Roering (2014), Diagenetic variation in the Oregon Coast Range: Implications for rock strength, soil production, hillslope form, and landscape evolution, Journal of Geophysical Research - Earth Surface, 119, 1395–1417, doi: 10.1002/2013JF003004.
Roering, J.J., B.H. Mackey, J.A. Marshall, K. Sweeney, A.M. Booth, N. Deligne, A.M. Handwerger, and C. Cerovski-Darriau, (2013), 'You are HERE': Connecting the dots with airborne lidar for geomorphic fieldwork, Geomorphology, 2012 Binghamton Symposium, "The Field Tradition in Geomorphology", doi: 10.10106/j.geomorph.2013.04.009.
Marshall, J.A. and L.S. Sklar (2012), Mining soil databases for landscape-scale patterns in the abundance and size distribution of hillslope rock fragments, Earth Surface Processes and Landforms, 37(3), 287-300, doi: 10.1002/esp.2241.
Roering, J., J. Marshall, A.M. Booth, M. Mort, and Q. Jin (2010), Evidence for biotic controls on topography and soil production, Earth and Planetary Science Letters, v. 298, p. 183-190, doi: 10.1016/j.epsl.2010.07.040. (Awarded the G.K. Gilbert Award for Excellence in Geomorphic Research, American Assoc. of Geographers, 2011)