Publications

Student and postdoctoral advisees are underlined.

Stokes, M.F., D. Kim, S.F. Gallen, E. Benavides, B.P. Keck, J. Wood, S.L.
Goldberg, I.J. Larsen, J.M. Mollish, J.W. Simmons, T.J. Near, and J.T. Perron (2023). Erosion of heterogeneous rock drives diversification of Appalachian fishes. Science 380, 855-859. https://doi.org/10.1126/science.add9791.

Deal, E.A., J.G. Venditti, S.J. Benavides, R. Bradley, Q. Zhang, K. Kamrin, and J.T. Perron (2023). Grain shape effects in bed load sediment transport. Nature 613, 298–302. https://doi.org/10.1038/s41586-022-05564-6. Free-to-read link

Birch, S.P.D., G. Parker, P.M. Corlies, J.M. Soderblom, J.W. Miller, R.V. Palermo, J.M. Lora, A.D. Ashton, A.G. Hayes, and J.T. Perron (2021). Reconstructing river flows remotely on Earth, Titan, and Mars. In review.

Schmidt, M., S.L. Goldberg, (24 others), and J.T. Perron. Intentional creation of carbon-rich soils in the ancient Amazon. In review.

Zhang, Q., E.A. Deal, J.T. Perron, J.G. Venditti, S.J. Benavides, M. Rushlow, and K. Kamrin (2022). Discrete simulations of fluid-driven transport of naturally shaped sediment particles. Journal of Geophysical Research – Earth Surface, in review.

Birch, S.P.D., A.G. Hayes, and J.T. Perron (2023). Titan’s Fluvial and Lacustrine Landscapes. In Titan After Cassini-Huygens, edited by R.M.C. Lopes, C. Elachi, I. Mueller-Wodarg and A. Solomonidou, in press.

Benavides, S.J., E.A. Deal, J.G. Venditti, R. Bradley, Q. Zhang, K. Kamrin, and J.T. Perron (2023). How fast or how many? Sources of intermittent sediment transport. Geophysical Research Letters, 50, e2022GL101919. https://doi.org/10.1029/2022GL101919.

Stokes, M.F., I.J. Larsen, S.L. Goldberg, S. McCoy, P. Prince, and J.T. Perron (2022). The erosional signature of drainage divide motion along the Blue Ridge Escarpment. Journal of Geophysical Research – Earth Surface, https://doi.org/10.1029/2022JF006757.

Zhang, Q., E.A. Deal, J.T. Perron, J.G. Venditti, S.J. Benavides, M. Rushlow, and K. Kamrin (2022). Fluid-driven transport of round sediment particles: From discrete simulations to continuum modeling. Journal of Geophysical Research – Earth Surface, 127, e2021JF006504. https://doi.org/10.1029/2021JF006504.

Benavides, S.J., E.A. Deal , M. Rushlow, J.G. Venditti , Q. Zhang, K. Kamrin, and J.T. Perron (2022). The impact of intermittency on bed load sediment transport. Geophysical Research Letters, 49, e2021GL096088. https://doi.org/10.1029/2021GL096088.

Goldberg, S.L., M. Schmidt and J.T. Perron (2021). Fast response of Amazon rivers to Quaternary climate cycles. Journal of Geophysical Research – Earth Surface, 126, e2021JF006416. https://doi.org/10.1029/2021JF006416.

Miller, J.W., S.P.D. Birch, A.G. Hayes, M.J. Malaska, R.M.C. Lopes, A.M. Schoenfeld, P.M. Corlies, D.M. Burr, T.G. Farr and J.T. Perron (2021). Fluvial Features on Titan and Earth: Lessons from Planform Images in Low-resolution SAR. The Planetary Science Journal, 2, 142, https://doi.org/10.3847/PSJ/ac0245.

Moon, S., J.T. Perron, S.J. Martel, B.W. Goodfellow, D. Mas Ivars, A. Simeonov, R. Munier, J.-O. Näslund, A. Hall, A.P. Stroeven, K. Ebert and J. Heyman (2020). Present-day stress field influences bedrock fracture openness in the deep subsurface. Geophys. Res. Lett., 47, e2020GL090581, https://doi.org/10.1029/2020GL090581.

Ferrier, K.L. and J.T. Perron (2020) The importance of hillslope scale in responses of chemical erosion rate to changes in tectonics and climate. J. Geophys. Res., 125, e2020JF005562, https://doi.org/10.1029/2020JF005562.

Stokes, M.F. and J.T. Perron (2020). Modeling the evolution of aquatic organisms in dynamic river basins. J. Geophys. Res., 125, e2020JF005652. https://doi.org/10.1029/2020JF005652.

Richardson, P.W., J.T. Perron, S.R. Miller and J.W. Kirchner (2020). Unraveling the mysteries of asymmetric topography at Gabilan Mesa, California. J. Geophys. Res., 125, e2019JF005378, http://doi.org/10.1029/2019JF005378.

Richardson, P.W., J.T. Perron, S.R. Miller and J.W. Kirchner (2020). Modeling the formation of topographic asymmetry by aspect-dependent erosional processes and lateral channel migration. J. Geophys. Res., 125, e2019JF005377, http://doi.org/10.1029/2019JF005377.

Daudon, C., A. Lucas, S. Rodriguez, S. Jacquemoud, A. Escalante Lopez, B. Grieger, E. Howington-Kraus, E. Karkoschka, R.L. Kirk, J.T. Perron, J.M. Soderblom, M. Costa. Daudon, C., Lucas, A., Rodriguez, S., Jacquemoud, S., Escalante López, A., Grieger, B., et al. (2020). A new digital terrain model of the Huygens landing site on Saturn’s largest moon, Titan. Earth and Space Science, 7, e2020EA001127, http://doi.org/10.1029/2020EA001127.

Jin, C., G. Coco, R. Tinoco, J.T. Perron, P. M. Myrow, K. L. Huppert, H. Friedrich, E. B. Goldstein, Z. Gongh (2020). Investigating the response of wave-generated ripples to changes in wave forcing. Geomorphology, 363, http://doi.org/10.1016/j.geomorph.2020.107229.

Bramante, J.F., J.T. Perron, A.D. Ashton and J.P. Donnelly (2020). Experimental quantification of bedrock abrasion under oscillatory flow. Geology, 48, 541–545, http://doi.org/10.1130/G47089.1.

Huppert, K.L., J.T. Perron and A.D. Ashton (2020). The influence of wave power on bedrock seacliff erosion in the Hawaiian Islands. Geology, 48, 499–503, http://doi.org/10.1130/G47113.1.

Huppert, K.L., J.T. Perron and L.H. Royden (2020). Hotspot swells and the lifespan of volcanic ocean islands. Science Advances, 6, eaaw6906, http://doi.org/10.1126/sciadv.aaw6906.

Pico, T., J.X. Mitrovica, J.T. Perron, K.L. Ferrier and J. Braun (2019). Influence of glacial isostatic adjustment on river evolution along the U.S. mid-Atlantic coast. EPSL, 522, 176-185, http://doi.org/10.1016/j.epsl.2019.06.026.

Richardson, P.W., J.T. Perron and N.D. Schurr (2019). Influences of climate and life on hillslope sediment transport. Geology, 47, 423-426, http://doi.org/10.1130/G45305.1.

Perron, J.T., P. Myrow, K.L. Huppert, A. Koss and A. Wickert (2018). Ancient record of changing flows from wave ripple defects. Geology, 46, 875-878, http://doi.org/10.1130/G45463.1.

Myrow, P., D. Jerolmack and J.T. Perron (2018). Bedform disequilibrium. Sedimentology, 88, 1096-1113, http://doi.org/10.2110/jsr.2018.55.

Chan, N.-H., J.T. Perron, J.X. Mitrovica and N.A. Gomez (2018). New Evidence of an Ancient Martian Ocean from the Global Distribution of Valley Networks. JGR Planets, 123, 2138-2150, http://doi.org/10.1029/2018JE005536.

Blackburn, T., K.L. Ferrier and J.T. Perron (2018). Coupled feedbacks between mountain erosion rate, elevation, crustal temperature, and density. EPSL, 498, 377-386, http://doi.org/10.1016/j.epsl.2018.07.003.

Stokes, M.F., S.L. Goldberg and J.T. Perron (2018). Ongoing river capture in the Amazon. Geophys. Res. Lett., 45, 5545-5552, http://doi.org/10.1029/2018GL078129.           

Black, B.A., J.T. Perron, D. Hemingway, E. Bailey, F. Nimmo and H. Zebker (2017). Global drainage patterns and the origins of topographic relief on Earth, Mars, and Titan. Science, 356, 727–731, http://doi.org/10.1126/science.aag0171.

Moon, S., J.T. Perron, S. Martel, W.S. Holbrook and J. St Clair (2017). A model of three-dimensional topographic stresses with implications for bedrock fractures, surface processes and landscape evolution. J. Geophys. Res., 122, 823-846, http://doi.org/10.1002/2016JF004155.

Perron, J.T. (2017). Climate and the pace of erosional landscape evolution. Annual Review of Earth and Planetary Sciences, 45, 561-591, http://doi.org/10.1146/annurev-earth-060614-105405.

Perron, J.T. and J.G. Venditti (2017). Megafloods Downsized. Nature, 538, 174–175, http://doi.org/10.1038/538174a.

Gabet, E.J., J.L.H. Burnham and J.T. Perron (2016), Critiques of the seismic hypothesis and the vegetation stabilization hypothesis for the formation of Mima mounds along the western coast of the US, Geomorphology, 269, 40–42, http://doi.org/10.1016/j.geomorph.2016.06.032.

Toomey, M.R., M.E. Raymo, A.D. Ashton and J.T. Perron (2016), Late Cenozoic sea level and the rise of modern rimmed atolls, Palaeogeography, Palaeoclimatology, Palaeoecology, 451, 73–83, http://doi.org/10.1016/j.palaeo.2016.03.018.

Toomey, M.R., J.D. Woodruff, J.P. Donnelly, A.D. Ashton and J.T. Perron (2016), Seismic evidence of glacial-age river incision into the Tahaa barrier reef, French Polynesia, Marine Geology, 380, 284–289, http://doi.org/10.1016/j.margeo.2016.04.008.

Mariotti, G., S. Pruss, X. Ai, J.T. Perron and T. Bosak (2016). Microbial origin of early animal trace fossils? J. Sedimentary Research, 86, 287–293, http://doi.org/10.2110/jsr.2016.19.

*St. Clair, J., *S. Moon, W.S. Holbrook, J.T. Perron, C.S. Riebe, S.J. Martel, B. Carr, C. Harmon, K. Singha and D. deB. Richter (2015). Geophysical imaging reveals topographic stress control of bedrock weathering, Science, 350, 534–538, http://doi.org/10.1126/science.aab2210. *co-first authors

Bellugi, D., D. Milledge, W.E. Dietrich, J.T. Perron and J. McKean (2015), Predicting shallow landslide size and location across a natural landscape: Application of a spectral clustering search algorithm, J. Geophys. Res., http://doi.org/10.1002/2015JF003520.

Huppert, K.L., L.H. Royden and J.T. Perron (2015), Dominant influence of volcanic loading on vertical motions of the Hawaiian Islands, EPSL, 418, 149–171, http://doi.org/10.1016/j.epsl.2015.02.027.

Perron, J.T. (2015). The wind in the hollows. Nature Geosci., 8, 254–255, http://doi.org/10.1038/ngeo2389.

Bellugi, D., D. Milledge, W.E. Dietrich, J. McKean, J.T. Perron, E. Sudderth and B. Kazian (2015), A spectral clustering search algorithm for predicting shallow landslide size and location, J. Geophys. Res., 120, 300–324, http://doi.org/10.1002/2014JF003137.

Slim, M., J.T. Perron, S.J. Martel and K. Singha (2015), Topographic stress and rock fracture: A two-dimensional numerical model for arbitrary surface topography and comparisons with borehole observations. Earth Surface Processes and Landforms, 40, 512–529, http://doi.org/10.1002/esp.3646.

Nienhuis, J.H., J.T. Perron, J.C.T. Kao and P.M. Myrow (2014), Wavelength selection and symmetry breaking in orbital wave ripples, J. Geophys. Res., 119, 2239-2257, http://doi.org/10.1002/2014JF003158.

Mariotti, G., S. Pruss, J.T. Perron and T. Bosak (2014), Microbial shaping of sedimentary wrinkle structures, Nature Geoscience, 7, 736–740, http://doi.org/10.1038/ngeo2229.

Richardson, A., C. Hill and J.T. Perron (2014), IDA: An implicit, parallelizable method for calculating drainage area. Water Resources Research, 50, 4110–4130, http://doi.org/10.1002/2013WR014326.

Mariotti, G., J.T. Perron and T. Bosak (2014), Feedbacks between flow, sediment motion and microbial growth on sand bars initiate and shape elongated stromatolite mounds. EPSL, 397, 93-100, http://doi.org/10.1016/j.epsl.2014.04.036.

Sori, M., J.T. Perron, P. Huybers and O. Aharonson (2014), A procedure for testing the significance of orbital tuning of the Martian polar layered deposits. Icarus, 235, 136–146, http://doi.org/10.1016/j.icarus.2014.03.009.

Willett, S.D., S.W. McCoy, J.T. Perron, L. Goren and C.Y. Chen (2014), Dynamic reorganization of river basins. Science, 343 (6175), 1248765, http://doi.org/10.1126/science.1248765.

Jefferson, A.J., K.L. Ferrier, J.T. Perron, and R. Ramalho (2014), Controls on the Hydrological and Topographic Evolution of Shield Volcanoes and Volcanic Ocean Islands, in The Galápagos: A Natural Laboratory for the Earth Sciences (eds K. S. Harpp, E. Mittelstaedt, N. d’Ozouville and D. W. Graham), John Wiley & Sons, Inc, Hoboken, New Jersey, 185–213, http://doi.org/10.1002/9781118852538.ch10.

Gabet, E.J., J.T. Perron and D.L. Johnson (2014), Biotic origin for Mima mounds supported by numerical model. Geomorphology, 206, 58–66, http://doi.org/10.1016/j.geomorph.2013.09.018.

Aharonson, O., A.G. Hayes, R. Lopes, A. Lucas, P. Hayne and J.T. Perron (2014), Titan’s Surface Geology. In Titan: Interior, Surface, Atmosphere and Space Environment, edited by I. Mueller-Wodarg, C. Griffith, E. Lellouch, and T. Cravens, Cambridge University Press, ISBN:9780521199926, 63–101. https://doi.org/10.1017/CBO9780511667398.005

Bosak, T., G. Mariotti, F.A. Macdonald, J.T. Perron and S.B. Pruss (2013), Microbial sedimen­tology of stromatolites in Neoproterozoic cap carbonates. In Ecosystem Paleobiology and Geobiology, Paleontological Special Papers Volume 19, Volume 19, A.M. Bush, S.B. Pruss, and J.L. Payne (eds.), 51–75. https://doi.org/10.1017/S1089332600002680

Tewelde, Y., J.T. Perron, P.G. Ford, S.R. Miller and B.A. Black (2013), Estimates of fluvial erosion on Titan from sinuosity of lake shorelines. J. Geophys. Res., 118, 2198–2212, http://doi.org/10.1002/jgre.20153.

Burr, D.M., S.A. Drummond, R. Cartwright, B.A. Black and J.T. Perron (2013), Morphology of flu­vial features on Titan: Evidence for structural control. Icarus, 226, 742–759, http://doi.org/10.1016/j.icarus.2013.06.016.

Ferrier, K.L., K.L. Huppert and J.T. Perron (2013), Climatic control of bedrock river incision. Nature, 496, 206–209, http://doi.org/10.1038/nature11982.  

Toomey, M., A.D. Ashton and J.T. Perron (2013), Profiles of ocean island coral reefs controlled by sea-level history and carbonate accumulation rates. Geology, 41, 731–734, http://doi.org/10.1130/G34109.1.

Dalca, A.V., K.L. Ferrier, J.X. Mitrovica, J.T. Perron, G.A. Milne, and J.R. Creveling (2013), On post-glacial sea level, III: Incorporating sediment redistribution. Geophys. J. Int., 194, 45–60, http://doi.org/10.1093/gji/ggt089.

Ferrier, K.L., J.T. Perron, S. Mukhopadhyay, M. Rosener, J.D. Stock, K.L. Huppert and M. Slosberg (2013), Covariation of climate and long-term erosion rates across a steep rainfall gradient on the Hawaiian island of Kaua’i. GSA Bulletin, 125, 1146–1163, http://doi.org/10.1130/B30726.1.

Royden, L. and J.T. Perron (2013), Solutions of the stream power equation and application to the evolution of river longitudinal profiles. J. Geophys. Res., 118, 497–518, http://doi.org/10.1002/jgrf.20031.

Perron, J.T. and L. Royden (2013), An integral approach to bedrock river profile analysis. Earth Surface Processes and Landforms, 38, 570-576, http://doi.org/10.1002/esp.3302.

Burr, D.M., J.T. Perron, M.P. Lamb, R.P. Irwin, G.C. Collins, A.D. Howard, L.S. Sklar, J.M. Moore, M. Adamkovics, V.R. Baker, S.A. Drummond and B.A. Black (2013), Fluvial features on Titan: Insights from morphology and modeling. GSA Bulletin, 125, 299-321, http://doi.org/10.1130/B30612.1.

Perron, J.T., P.W. Richardson, K.L. Ferrier, and M. Lapôtre (2012), The root of branching river networks. Nature, 492, 100–103, http://doi.org/10.1038/nature11672.

Lee, J.-E., B.R. Lintner, J.D. Neelin, X. Jiang, C.K. Boyce, J.B. Fisher, J.T. Perron, T.L. Kubar, R.T. Pierrehumbert, J. Lee and J. Worden (2012), Reduction of tropical land region precipitation variability via transpiration. Geophys. Res. Lett., 39, L19704, http://doi.org/10.1029/2012GL053417.  

Black, B.A., J.T. Perron, D.M. Burr and S.L. Drummond (2012), Estimating erosional exhumation on Titan from drainage network morphology. J. Geophys. Res., 117, E08006, http://doi.org/10.1029/2012JE004085.

Limaye, A.B.S., O. Aharonson and J.T. Perron (2012), Detailed stratigraphy and bed thickness of the Mars north and south polar layered deposits. J. Geophys. Res., 117, E06009, http://doi.org/10.1029/2011JE003961.

Lamb, M.P., W.W. Fischer, T.D. Raub, J.T. Perron and P.M. Myrow (2012), Origin of giant wave ripples in Snowball Earth cap carbonate. Geology, 40, 827–830, http://doi.org/10.1130/G33093.1.

Pelletier, J.D. and J.T. Perron (2012), Analytic solution for the morphology of a soil-mantled val­ley undergoing steady headward growth: Validation using case studies in southeastern Arizona. J. Geophys. Res., 117, F02018, http://doi.org/10.1029/2011JF002281.

Perron, J.T. and J. Hamon (2012), Equilibrium form of horizontally retreating, soil-mantled hill-slopes: Model development and application to a groundwater sapping landscape. J. Geophys. Res., 117, F01027, http://doi.org/10.1029/2011JF002139.

Blackburn, T.J., S.A. Bowring, J.T. Perron, K.H. Mahan, F.O. Dudas and K.R. Barnhart (2012), An exhumation history of continents over billion-year time scales. Science, 335, 73–76, http://doi.org/10.1126/science.1213496.

Perron, J.T. and S. Fagherazzi (2012), The legacy of initial conditions in landscape evolution. Earth Surface Processes & Landforms, 37, 52–63, http://doi.org/10.1002/esp.2205.

Perron, J.T. (2011), Numerical methods for nonlinear hillslope transport laws. J. Geophys. Res., 116, F02021, http://doi.org/10.1029/2010JF001801. Download example code that performs the calculations described in the paper.

Perron, J.T., J.W. Kirchner and W.E. Dietrich (2009), Formation of evenly spaced ridges and valleys. Nature, 460, 502–505, http://doi.org/10.1038/nature08174.  

Booth, A., J. Roering and J.T. Perron (2009), Automated landslide mapping using spectral analysis and high-resolution topographic data: Puget Sound lowlands, Washington, and Portland Hills, Oregon. Geomorphology, 109, 132–147, http://doi.org/10.1016/j.geomorph.2009.02.027.

Perron, J.T. and P. Huybers (2009), Is there an orbital signal in the polar layered deposits on Mars? Geology, 37, 155–158, http://doi.org/10.1130/G25143A.1.

Kite, E.S., I. Matsuyama, M. Manga, J.T. Perron and J.X. Mitrovica (2009), True polar wander driven by late-stage volcanism and the distribution of paleopolar deposits on Mars. EPSL, 280, 254– 267, http://doi.org/10.1016/j.epsl.2009.01.040.

Perron, J.T., W.E. Dietrich and J.W. Kirchner (2008), Controls on the spacing of first-order valleys. J. Geophys. Res., 113, F04016, http://doi.org/10.1029/2007JF000977. 

Perron, J.T., J.W. Kirchner and W.E. Dietrich (2008), Spectral signatures of characteristic spatial scales and nonfractal structure in landscapes. J. Geophys. Res., 113, F04003, http://doi.org/10.1029/2007JF000866. Download the 2DSpecTools software package used to perform the calculations in this paper.

Daradich, A., J.X. Mitrovica, I. Matsuyama, J.T. Perron, M. Manga and M.A. Richards (2008), Equi­librium rotational stability and figure of Mars. Icarus, 194, 463–475, http://doi.org/10.1016/j.icarus.2007.10.017.

Dietrich, W.E., J. McKean, D. Bellugi and J.T. Perron (2008), The prediction of shallow landslide location and size using a multidimensional landslide analysis in a digital terrain model. Proceedings of the Fourth International Conference on Debris-Flow Hazards Mitigation, C.-L. Chen & J. J. Major (eds), ISBN: 978-90-5966-059-5. https://www.fs.usda.gov/treesearch/pubs/32879

Perron, J.T., J.X. Mitrovica, M. Manga, I. Matsuyama and M.A. Richards (2007), Evidence of an an­cient martian ocean in the topography of deformed shorelines. Nature, 447, 840–843, http://doi.org/10.1038/nature05873.

Roering, J.J., J.T. Perron and J.W. Kirchner (2007), Functional relationships between denudation and hillslope form and relief. EPSL, 264, 245–258, http://doi.org/10.1016/j.epsl.2007.09.035.

Lamb, M.P., A.D. Howard, W.E. Dietrich and J.T. Perron (2007), Formation of amphitheatre­-headed valleys by waterfall erosion after large-scale slumping on Hawai’i. GSA Bulletin, 119, 805–822, http://doi.org/10.1130/B25986.1.

Perron, J.T., M.P. Lamb, C.D. Koven, I.Y. Fung, E. Yager and M. Adamkovics (2006), Valley forma­tion and methane precipitation rates on Titan. J. Geophys. Res., 111, E11001, http://doi.org/10.1029/2005JE002602.

Dietrich, W.E. and J.T. Perron (2006), The search for a topographic signature of life. Nature, 439, 411–418, http://doi.org/10.1038/nature04452.

Matsuyama, I., J.X. Mitrovica, M. Manga, J.T. Perron and M.A. Richards (2006), Rotational stability of dynamic planets with elastic lithospheres. J. Geophys. Res., 111, E02003, http://doi.org/10.1029/2005JE002447.

Lamb, M.P., A.D. Howard, J. Johnson, K.X. Whipple, W.E. Dietrich and J.T. Perron (2006), Can springs cut canyons into rock? J. Geophys. Res., 111, E07002, http://doi.org/10.1029/2005JE002663.

Perron, J.T., and I. de Pater (2004), Dynamics of an ice continent on Titan. Geophys. Res. Lett., 31, L17S04, http://doi.org/10.1029/2004GL019802.

Perron, J.T., W.E. Dietrich, A.D. Howard, J.A. McKean and J.A. Pettinga (2003), Ice-driven creep on Martian debris slopes. Geophys. Res. Lett., 30(14), 1747, http://doi.org/10.1029/2003GL017603.

Fuis, G.S., and 23 others (2001), Report for borehole explosion data acquired in the 1999 Los An­geles Region Seismic Experiment (LARSE II), Southern California. USGS Open File Report 01-408, http://geopubs.wr.usgs.gov/open-file/of01-408/.

Yamada, S., N. Goring-Morris, A. Gopher, and J.T. Perron (2001), Analysis of Faintly Glossed Blades from Pre-Pottery Neolithic Nahal Issaron, Israel. In: Caneva, I. Lemorini, C. Zampetti, D. and Biagi, P. (eds.) Beyond tools: Redefining the PPN lithic assemblages of the Levant, Proceedings of the Third Workshop on PPN Chipped Lithic Industries (Ca’Foscari University of Venice, Nov. 1998), Berlin, ex oriente, 183-204.

Perron, J.T. and C.A.S. Mandryk (1999), Preliminary report on the micromorphology of the Cactus Hill Site (44SX202), Sussex County, Virginia. Current Research in the Pleistocene, 16, 62–64.