*Denotes student author
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]
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]
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]
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]
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]
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]
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]
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]
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]
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]
Portenga, EW & Bierman, PR. Understanding Earth’s eroding surface with 10Be: GSA Today, 21(8), 4–10. [LINK]
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]
Bierman, P & Portenga, E. Beryllium Isotopes. In White, WM (Ed.) Encyclopedia of Geochemistry. Springer International Publishing. [LINK]
*Denotes student presenter
Clark, CM, Kolbus, LM, & Portenga, EW. Integrating generative AI into a geoscience curriculum. 2024 Geological Society of America Annual Meeting: Anaheim, California, USA.
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.
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.
*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.
*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.
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.
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.
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.
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.
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.
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.
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.
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.
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.