Publications

*Denotes student author

2024

• Shepherd*, B, Portenga, EW, Peplinski*, AJ. Quantifying the effects of carborundum rock-surface smoothing for Schmidt Hammer R-value metrics measured on glacial erratics in the North American Great Lakes: Earth Surface Processes and Landforms, preprint available online. [LINK]

2023

• Portenga, EW, Ullman, DJ, Corbett, LC, Bierman, PR, & Caffee, M. Early Holocene ice retreat from Isle Royale in the Laurentian Great Lakes constrained with 10Be exposure-age dating: Geochronology, 5(2), 413–431. [LINK]

2022

• VanLandingham*, L, Portenga, EW, Lefroy, EC, Schmidt, AH, Bierman, PR, & Hidy, AJ. Comparison of basin-scale in situ and meteoric 10Be erosion and denudation rates in felsic lithologies across an elevation gradient at the George River, northeast Tasmania, Australia: Geochronology, 4(1), 153–172. [LINK]

2019

• Portenga, EW, Bierman, PR, Rood, DH, Trodick, CD, Pavich, MJ, & DeJong, BD. Erosion rates and sediment generation within the Potomac River basin over millennial timescales using beryllium isotopes: Geological Society of America Bulletin, 131(7–8), 1295–1311. [LINK]

2018

• Bierman, PR, Rood, D, Shakun, J, Portenga EW, & Corbett, L. Directly dating post-glacial Greenlandic emergence at high resolution using in situ 10Be: Quaternary Research, 90(1), 110–126. [LINK]

2017

• Reusser, L, Bierman, P, Rizzo, DM, Portenga, EW, & Rood, DH. Characterizing landscape-scale erosion using 10Be in detrital fluvial sediment – slope-based sampling strategy detects the effect of widespread dams: Water Resources Research, 53(5), 4476–4486. [LINK]

• Portenga, EW, Bishop, P, Rood, DH, & Bierman, PR. Combining bulk sediment OSL and meteoric 10Be fingerprinting techniques to identify gully initiation sites and erosion depths: Journal of Geophysical Research: Earth Surface, 122(2), 455–572. [LINK]

• Linari, C, Bierman, P, Portenga, EW, Pavich, M, & Finkel, R. Rates of erosion and landscape change along the Blue Ridge escarpment, southern Appalachian Mountains, estimated from in situ cosmogenic 10Be: Earth Surface Processes and Landforms, 42(6), 928–940. [LINK]

2016

• Portenga, EW, Bishop, P, Gore, DB, & Westaway, KE. Landscape preservation under post-European settlement alluvium in the southeastern Australian Tablelands, inferred from portable OSL reader data: Earth Surface Processes and Landforms, 41(12), 1697–1707. [LINK]

• Portenga, EW, Westaway, KE, & Bishop, P. Timing of post-European settlement alluvium deposition in SE Australia: A legacy of European land use in the Goulburn Plains: The Holocene, 26(9), 1472–1485. [LINK]

• Portenga, EW, Rood, DH, Bishop, P, & Bierman, PR. A late Holocene onset of Aboriginal burning in southeastern Australia: Geology, 44(2), 131–134. [LINK]

2015

• Portenga, EW & Bishop, P. Confirming geomorphological interpretations based on portable OSL reader data: Earth Surface Processes and Landforms, 41(3), 427–432. [LINK]

• Portenga, EW, Bierman, PR, Duncan, C, Corbett, LB, Kehrwald, NM, & Rood, DH. Erosion rates of the Bhutanese Himalaya determined using in situ-produced 10Be: Geomorphology, 233, 112–126. [LINK]

2014

• Duxbury, J, Bierman, PR, Portenga, EW, Pavich, MJ, Southworth, S, Miguéns-Rodríguez, M, & Freeman, S. Erosion rates in and around Shenandoah National Park, VA, determined using analysis of cosmogenic 10Be: American Journal of Science, 35(1), 46–76. [LINK]

• Bierman, PR, Coppersmith, R, Hanson, K, Neveling, J, Portenga, EW, & Rood, DH. A cosmogenic view of erosion, relief generation, and the age of faulting in southern Africa: GSA Today, 24(9), 4–11. [LINK]

2013

• Portenga, EW, Bierman, PR, Rizzo, DM, & Rood, DH. Low rates of bedrock outcrop erosion in the central Appalachian Mountains inferred from in situ 10Be: Geological Society of America Bulletin, 125(1/2), 201–215. [LINK]

2011

• Portenga, EW & Bierman, PR. Understanding Earth’s eroding surface with 10Be: GSA Today, 21(8), 4–10. [LINK]

2021

• Bierman, PR, Bender, AM, Christ, AJ, Corbett, LB, Halsted, CT, Portenga, EW, & Schmidt, AH. Dating by Cosmogenic Nuclides. In Alderton, D and Elias, SA (Eds.) Encyclopedia of Geology (Second Edition). Academic Press, Elsevier Publishing. [LINK]

2017

• Bierman, P & Portenga, E. Beryllium Isotopes. In White, WM (Ed.) Encyclopedia of Geochemistry. Springer International Publishing. [LINK]

*Denotes student presenter

2024

• Clark, CM, Kolbus, LM, & Portenga, EW. Integrating generative AI into a geoscience curriculum. 2024 Geological Society of America Annual Meeting: Anaheim, California, USA.

2023

• Portenga, EW, Bogoski*, CJ, O'Neill*, C, Skora*, S, Townsend, KF, Corbett, LB, Bierman, PR, Clark, MK, & Caffee, M. 10Be reproducibility in the Santa Monica Mountains from 2016–2021: A longitudinal 10Be replicates study through fire, atmospheric rivers, and mass movements. 2023 Geological Society of America Annual Meeting: Pittsburgh, Pennsylvania, USA.

• Portenga, EW, Dullman, DJ, Corbett, LB, Bierman, PR, & Caffee, MW. The timing of Laurentide Ice Sheet retreat from Isle Royale in Lake Superior based on 10Be exposure ages. 2023 Geological Society of America Annual Meeting: Pittsburgh, Pennsylvania, USA.

• Shepherd*, BS, Portenga, EW, Ceperley, EG, & Ullman, DJ. Applications of Schmidt Hammer exposure-age dating in the North American Great Lakes region: An elusive endeavor. 2023 Geological Society of America Annual Meeting: Pittsburgh, Pennsylvania, USA.

• Shepherd*, BS, Portenga, EW, Ceperley, EG, & Ullman, DJ. Limited application of Schmidt hammer exposure-age dating in the Great Lakes region. 2023 North-Central Geological Society of America Section Meeting: Grand Rapids, Michigan, USA.

2022

• Portenga, EW, Bogoski*, CJ, Townsend, KF, Bierman, PR, Corbett, LB, Clark, MK, & Caffee, M. The impact of the 2018 Woolsey Fire on 10Be concentrations measured in stream sand in the Santa Monica Mountains. 2022 Geological Society of America Annual Meeting: Denver Colorado, USA.

2021

• *Bogoski, CJ, Portenga, EW, Corbett, LB, Bierman, PR, & Caffee, MW. Reproducibility of 10Be concentrations in stream sand following the 2018 Woolsey Fire in Solstice Canyon, Santa Monica Mountains, California. 2021 Geological Society of America Annual Meeting: Portland, Oregon, USA.

2019

• *Kennedy, SA, Portenga, EW, Murray, KE, Bhattarai, S. Exploring a possible link between trackless zircons and regional volcanism in northern Australia. 2019 Geological Society of America Annual Meeting: Phoenix, Arizona, USA.

• Portenga, EW, Bierman, PR, Trodick, CD, DeJong, B, Rood, DH, Pavich, MJ. The current state of post-Colonial landscape disturbance to the Potomac River and Chesapeake Bay. 2019 Geological Society of America Annual Meeting: Phoenix, Arizona, USA.

• *VanLandingham, LA, Portenga, EW, Bierman, PR, Lefroy, T. Analysis of 10Be-based erosion and denudation rates in the George River Basin, Tasmania, Australia. 2019 Geological Society of America Annual Meeting: Phoenix, Arizona, USA.

2018

• Portenga, EW, Murray, KE, Bhattarai, S, Bird, M, Corbett, LB, Bierman, PR, Caffee, MW, Thomson, SN, Fu, X, Li, B. Investigating landscape response to human arrival to Australia and anthropogenic fire using cosmogenic isotopes and low-temperature thermochronometers. 2018 Geological Society of America Annual Meeting: Indianapolis, Indiana, USA.

• *Fraleigh, MC, Portenga, EW, Weber, J. Fault-slip analysis on mesofaults of the Ste. Genevieve Fault System, Hickory Canyons State Recreation Area, Eastern Missouri. 2018 Geological Society of America Annual Meeting: Indianapolis, Indiana, USA.

2017

• Portenga, EW, Clark, MK, Niemi, NA. Spatial and temporal patterns of motion along the Malibu Coastal Fault inferred from 10Be erosion rates. 2017 American Geophysical Union Annual Meeting: New Orleans, Louisiana, USA.

2015

• Bierman, PR, Portenga, EW, Kirby, E. Mapping erosion of the Appalachian Mountains using cosmogenic 10-Be. 2015 Geological Society of America Annual Meeting: Baltimore, Maryland, USA.

• Portenga, EW, Bishop, P, Gore, DB, Westaway, KE. Valley bottom preservation and disturbance in the southeastern Tablelands of post-European Australia. 2015 UK Luminescence and ESR Conference: Glasgow, United Kingdom.

2014

• Portenga, EW, Bishop, P, Gore, DB, Westaway, KE, Rood, DH, Bierman, PR. The when, what and how of gully erosion and sediment deposition on the Tablelands of New South Wales, Australia. 2014 Geological Society of America Annual Meeting: Vancouver, British Columbia, Canada.

• Portenga, EW, Bishop, P, Gore, DB, Westaway, KE. Landscape change on the SE Australian Tablelands in the Holocene: An updated chronology of gully incision and ‘post-settlement’ alluviation. 2014 European Geosciences Union General Assembly: Vienna, Austria.

2013

• Portenga, EW, Bishop, P, Gore, DB, Westaway, KE. Shedding light on recent events: Assessing the timing of gully erosion and sediment deposition on the Australian Tablelands using a portable OSL reader. 2013 Geological Society of America Annual Meeting: Denver, Colorado, USA.

• Portenga, E, Bierman, P, Duncan, C. Rain, water, and ice: Driving forces behind rapid erosion in western Bhutan. 2013 International Association of Geomorphologists International Conference: Paris, France.

2012

• Portenga, EW, Bishop, P, Gore, D, Westaway, K. Shedding Light on Recent Events: Using Portable Optically Stimulated Luminescence Techniques to Assess Anthropocene Landscape Change on the SE Australian Tablelands. 2012 Australia & New Zealand Geomorphology Group Annual Meeting: Bundanoon, New South Wales, Australia.

2011

• Bierman, PR, Reusser, L, Portenga, E. Using 10Be to quantify rates of landscape change in ‘dead’ orogens – millennial scale rates of bedrock and basin-scale erosion in the southern and central Appalachian Mountains. 2011 American Geophysical Union Fall Meeting: San Francisco, California, USA.

2010

• Nichols, KK, Bierman, PR, Reusser, LJ, Portenga, E, Matmon, A, Rood, DH. Dual 10Be isotope systems constrain the source of sediment and rate of erosion for the tropical Barron River catchment, Queensland, Australia. 2012 American Geophysical Union Fall Meeting: San Francisco, California, USA.

• Portenga, EW, Bierman, PR, Trodick, CD, Rood, DH. Low rates of bedrock outcrop erosion in the Central Appalachian Mountains inferred from in situ 10Be concentrations. 2010 Geological Society of America Annual Meeting: Denver, Colorado, USA.

• Bierman, PR, Portenga, EW, Reusser, L, Graly, J, Corbett, AB, Borg, J. Three decades tracing erosion and sediment with cosmogenic nuclides – where do we go next? Landscapes to Rock. Geological Society of London: London, UK.

2009

• Portenga, EW, Bierman, PR, Rizzo, DM. A Global Summary and Analysis of Exposed Bedrock Erosion Rates Estimated Using In Situ 10Be. 2009 Geological Society of America Annual Meeting: Portland, Oregon, USA.