Aug. 2004 to Present: Professor, Department of Earth & Planetary Sciences, University of New Mexico.
Aug. 2017 to Aug. 2018: Acting Associate Dean for Research, College of Arts & Sciences, University of New Mexico.
Aug. 2013 to July 2016: Chair, Department of Earth & Planetary Sciences, University of New Mexico.
Aug. 2000 to 2004: Professor and Associate Chair, Department of Earth & Planetary Sciences, University of New Mexico.
Aug. 1997 to Aug. 2000: Professor and Associate Dean Academic Affairs, College of Arts & Sciences, University of New Mexico.
Aug. 1996 to 1999: Associate Chair, Department of Earth & Planetary Sciences, University of New Mexico.
Aug. 1992 to 1999: Associate Professor, Department of Earth and Planetary Sciences, University of New Mexico.
Aug. 1986 to Aug.1992: Assistant Professor, Department of Geology, University of New Mexico, Albuquerque, New Mexico.

Ph.D., Geology, 1985. University of Wyoming, Laramie, Wyoming. Dissertation title: “The origin and role of water-soluble organic compounds in clastic diagenetic systems”. Advisor: Dr. Ronald C. Surdam.
M.A., Geology, 1979. Washington University, St. Louis, Missouri. Thesis title: “Intraflow chemical variations in Servilleta basalts, Taos Plateau Volcanics, Taos, New Mexico”. Advisor: Dr. Larry Haskin.
B.A., Geology, 1977. The Colorado College, Colorado Springs, Colorado.


Geological Society of America Fellow (since 2008)
Birdsall-Dreiss Distinguished Lecturer, 2019 (Hydrogeology Division of GSA).
Career Achievement Award, 2015; American Institute of Professional Geologists.
Distinguished Lecturer 1995-1996; American Association of Petroleum Geologists.
Mentor of the Year, 2000-2001; UNM PURSUE Program.
Distinguished Service Award, New Mexico Geological Society.


Spilde, M.A., Northup, D.E., Boston, P.J., Schelble, R.T., Dano, K.E., Crossey, L.J., Dahm, C.N., 2005, Geomicrobiology of cave ferromanganese deposits: a field and laboratory investigation: Geomicrobiology Journal, v. 22, p. 99-116.

Timmons*, J.M., Karlstrom, K.E., Heizler, M.T., Bowring, S.A., Gehrels, G.E., Crossey, L.J., 2005, Tectonic inferences from the ca. 1255-1100 Ma Unkar Group and Nankoweap Formation, Grand Canyon: Intracratonic deformation and basin formation during protracted Grenville orogenesis: Geological Society of America Bulletin, v. 117, 1573-1595.

Crossey, L.J., Fischer, T.P., Patchett, P.J., Karlstrom, K.E., Hilton, D.R., Newell*, D.L., Huntoon, P., and Reynolds, A.C.*, 2006, Dissected hydrologic system at Grand Canyon: interaction between upper world and lower world waters in modern springs and travertine: Geology, v. 34, p.25-28.

Bloch, J.D., Timmons*, J.M., Crossey, L.J., Gehrels, G.E., Karlstrom, K.E., 2006, The shale petrology and detrital zircon geochronology of the Mesoproterozoic Unkar Group, Grand Canyon: far-travelled Grenville-aged detritus deposited in intracratonic Rodinia, Journal of Sedimentary Petrology, v. 76, p. 1106-1119.

Anders*, M.A., Pederson, J.L., Rittenhour, T.M., Sharp, W.D., Gosse, J.C., Karlstrom, K.E., Crossey, L. J., Goble, R.J., Stockli, L., and Yang, G., 2006, Pleistocene geomorphology and geochronology of eastern Grand Canyon: Linkages of landscape components during climate changes: Quaternary Science Reviews v. 24, p. 2428-2448.

O’Brien, G.*, Kaufman, D., Sharp, W., Atudorei, V., Parnell, R., Crossey, L., 2006, Oxygen isotope composition of modern and mid-Holocene banded travertine, Grand Canyon, Arizona, USA, Quaternary Research, v. 65, p. 366-379.

Pederson, J.L., Anders*, M.D., Rittenhour, T.M., Goble, R.J., Sharp, W.D., Gosse, J.C., Karlstrom, K.E., Crossey, L.J., and Finkel, R.C., 2006, Using fill terraces to understand incision rates and evolution of the Colorado River in eastern Grand Canyon, Arizona, Journal of Geophysical Research – Earth Surface, v. 111: F02003 doi:10.1029/2004JF000201.

Vinson*, D.S., Block, S., Crossey, L.J., and Dahm, C.N. 2007, Biogeochemistry at the zone of intermittent saturation: Field-based study of the shallow alluvial aquifer, Rio Grande, New Mexico: Geosphere, v. 3 p. 366-380.

Karlstrom, K.E., Crow*, R., Peters, L., McIntosh, W., Raucci*, J., Crossey, L.J., Umhoefer, P., Dunbar, N., 2007, 40Ar/39Ar and field studies of Quaternary basalts in Grand Canyon and model for carving Grand Canyon: Quantifying the interaction of river incision and normal faulting across the western edge of the Colorado Plateau: GSA Bulletin, v. 119, p. 1283-1312.

Hall*, J.R., Mitchell*, K.R., Jackson-Weaver*, O., Crossey, L.J., Kooser*, A., Cron, B.* and Takacs-Vesbach, C.D., 2008, Molecular Characterization of the Diversity and Distribution of a Thermal Spring Microbial Community using rRNA and Functional Genes: Applied and Environmental Microbiology, v. 74, p. 4910-4922.

Karlstrom, K.E., Crow*, R, Crossey, L.J., Coblentz, D., and van Wijk, J., 2008, Model for tectonically driven incision of the less than 6 Ma Grand Canyon: Geology,v. 36, p. 835-838.

Crossey, L.J., Karlstrom, K.E., Springer, A., Newell*, D., Hilton, D., and Fischer, T., 2009, Degassing of mantle-derived CO2 and 3He from springs in the southern Colorado Plateau region— neotectonic connections and implications for groundwater systems: Geological Society of America Bulletin, v. 121, 1034-1053. DOI 10.1130/B26394.

Karlstrom, K., Semken, S., Crossey, L., Perry, D., Gyllenhaal, E. D., Dodick, J., Williams, M., Hellmich-Bryan, J., Crow*, R., Bueno Watts*, N., & Ault, C. (2008). Informal geoscience education on a grand scale: the Trail of Time exhibition at Grand Canyon. Journal of Geoscience Education, 56(4), 354-361.

*Kirk, M.F., Crossey, L.J., Takacs-Vesbach, C., Newell, D.L., Bowman, R.S., 2009, Effect of saline groundwater upwelling on iron and manganese cycling in the Rio Grande floodplain aquifer: Applied Geochemistry, v. 24, 426-437.

Aster, R., MacCarthy, J., Heizler, M., Kelley, S., Karlstrom, K., Crossey, L., Dueker, K., and the CREST Team, 2009, CREST Experiment Probes the Roots and Geologic History of the Colorado Rockies: The Outcrop, v. 38, p. 6-11.

Semken, S., Dodick, J., Frus, R., Wells, M., Perry, D., Bryan, J., Williams, M., *Crow, R., Crossey, and Karlstrom, K., 2009. Studies of informal geologic time learning at the ‘Trail of Time’ in Grand Canyon National Park: The Informal Learning Review, 99, p. 1-5.

*Kirk, M.F., Roden, E.E., Crossey, L.J., Brearley, A.J., Spilde, M., 2010, Experimental analysis of arsenic precipitation during microbial sulfate and iron reduction in model aquifer sediment reactors: Geochimica et Cosmochimica Acta, v. 74, p. 2538-2555.

Banerjee, A., Person, M., Hofstra, A., Sweetkind, D., Cohen, D., Sabin, A., Unruh, J., Zyvoloski, G., Gable, C.W., Crossey, L., and Karlstrom, K., 2011, Deep Permeable Fault-Controlled Helium Transport and Limited Mantle Flux in Two Extensional Geothermal Systems in the Great Basin, USA: Geology, v. 39, p. 195-198.

Karlstrom, K.E., Coblentz, D., Dueker, K., Ouimet, W., Kirby, E., Van Wijk, J., Schmandt*, B., Kelley, S., Lazear, G., Crossey, L.J., Crow*, R., Aslan, A, Darling*, A., Aster, R., MacCarthy*, J., Hansen*, S.M., Stachnik*, J., Stockli, D.F., Hoffman*, M., McKeon*, R., Feldman*, J. Heizler, M., Donahue*, M.S., and the CREST working group, 2012, Mantle-driven dynamic uplift of the Rocky Mountains and Colorado Plateau and its surface response: Toward a unified hypothesis: Lithosphere, v. 4 no. 1, p. 3-22.

Karlstrom, K.E., Lee, J., Kelley, S.A., Crow, R., Young, R.A., Lucchitta, I., Beard, L.S., Dorsey. R., Ricketts, J.W., Dickinson, W.R., and Crossey, L.C., 2013, Arguments for a young Grand Canyon: Technical Comment on: R. M. Flowers & K. A. Farley, Apatite 4He/3He and (U-Th)/He Evidence for an Ancient Grand Canyon: Science, v. 340, no. 6129 p. 143.

Karlstrom, K.E., Crossey, L.C., Hilton, D.R., and Barry, P.H., 2013, Active mantle degassing above the Aspen Anomaly of Colorado: Mantle to surface interconnections and implications for neotectonics of the Rocky Mountains: Geology, v. 41, no. 4, p. 495-498, doi:10.1130/G34007.1.

Williams*, A.J., Crossey, L.J., Karlstrom, K.E., Newell, D., Person, M., and Woolsey*, E., 2013, Hydrogeochemistry of the Middle Rio Grande aquifer system – fluid mixing and salinization of the Rio Grande due to fault inputs: Chemical Geology, v. 351, p. 281-298.

Karlstrom, K.E., Darling*, A., Crow, R., Lazear, G., Aslan, A., Granger, D., Kirby, E., Crossey, L., and Whipple, K., 2013, Colorado River chronostratigraphy at Lee’s Ferry, Arizona, and the Colorado Plateau bull’s eye of incision; Forum Comment: Geology, doi:10.1130/G34550C.1.

Karlstrom, K.E., Lee, J., Kelley, S., Crow*, R., Young, R., Lucchitta, I., Beard, S., Dorsey, R., Ricketts, J., Dickinson, W., and Crossey, L., 2013, Comment on: “Apatite 4He/3He and (U-Th)/He evidence for an ancient Grand Canyon: Science: v. 340, no. 6129 p. 143, DOI: 10.1126/science.1233982.

Wolaver, B.D., Crossey, L.J., Karlstrom, K.E., Banner, J.L., Cardenas, M.B., Ojeda, C.G., Sharp, J.M., 2013, Identifying origins of and pathways for spring waters in a semiarid basin using He, Sr, and C isotopes: Cuatrociénegas Basin, Mexico: Geosphere 9 (1), 113-125.

Love, A.J., Shand, P., Karlstrom, K.E., Crossey, L.J., Rousseau-Gueutin, P., Priestley, S., 2013, Geochemistry and Travertine Dating Provide New Insights into the Hydrogeology of the Great Artesian Basin, South Australia: Procedia Earth and Planetary Science, v. 7, p. 521-524.

Colman*, D.R., Garcia*, J.R., Crossey, L.J., Karlstrom, K.E., Jackson‐Weaver*, O, Takacs- Vesbach, T., 2013, An analysis of geothermal and carbonic springs in the western United States sustained by deep fluid inputs: Geobiology v. 12 (1), p. 83-98.

Ricketts*, J., Karlstrom, K.E., Crossey, L.J., and Priewisch*, A., 2014, Persistent Quaternary extension in the Rio Grande rift at elevated strain rates: Interaction between magmatism, fluid-enhanced paleoseismicity, and travertine deposition documented in central New Mexico: Lithosphere, v. 6, p. 3-16.

Priewisch, A., Crossey, L.J., Karlstrom, K.E., Polyak, V.J., Asmerom, Y., Nereson, A. and Ricketts, J.W., 2014, U-series geochronology of large-volume Quaternary travertine deposits of the southeastern Colorado Plateau: Evaluating episodicity and tectonic and paleohydrologic controls: Geosphere, v. 10, p. 401-423.

Karlstrom, K.E., Lee, J., Kelley, S., Crow, R., Crossey, L.J., Young, R., Lazear, G., Beard, L.S., and Ricketts, J., Fox, M., Shuster D., 2014, Formation of the Grand Canyon 5 to 6 million years ago through integration of older palaeocanyons: Nature Geoscience, v. 7, p. 239-244.

Sherson*, L., van Horn, D., Gomez-Velez, J., Crossey, L., Dahm, C., 2015, Nutrient Dynamics in an Alpine Headwater Stream: Use of Continuous Water Quality Sensors to Examine Responses to Wildfire and Precipitation Events: Hydrologic Processes, v. 29, p. 3193-3207.

Seixas, G., Resor, P., Lopez-Pearce*, J., Karlstrom, K., and Crossey, L., 2015, Constraints on the evolution of vertical deformation and Colorado River incision near eastern Lake Mead, AZ, provided by quantitative structural mapping of the Hualapai Limestone: Geosphere, v. 11, p. 31-49, doi: 10.1130/GES01096.1.

Crossey, L.J., Karlstrom, K.E., Dorsey, R., Pearce*, J., Wan, E., Beard, L.S., Asmerom, Y., Polyak, V., Crow, R.S, Cohen, A., Bright*, J., Huth, 2015, The importance of groundwater in propagating downward integration of the 6-5 Ma Colorado River System: Geochemistry of springs, travertines and lacustrine carbonates of the Grand Canyon region over the past 12 million years: Geosphere, v. 11; no. 3; p. 660–682; doi:10.1130/GES01073.1.

Crow, R., Karlstrom, K., Crossey, L., Young, R., Ort, M.H., Asmerom, Y., Polyak, V., and Darling, A., 2015, Rates of river incision and scarp retreat in eastern and central Grand Canyon over the past half million years: Evidence for passage of a transient knickzone: COMMENT: Geosphere, v. 11, p. 2130-2131. doi:10.1130/GES01243.1.

Crow, R., Karlstrom, K., McIntosh, W., Peters, L., Crossey, L., Eyster*, A., 2015, A new model for Quaternary lava dams in Grand Canyon based on 40Ar/ 39Ar dating, basalt geochemistry, and field mapping: Geosphere, v. 11, p. 1305-1342, doi:10.1130/GES01128.1

Howald, T., Person, M., Campbell, A., Lueth, V., Hofstra, A., Sweetkind, D., Gable, CW, Banerjee, A., Luijendijk, E., Crossey, L., Karlstrom, K., Kelley, S., Phillips, F., 2015, Evidence for long timescale (> 103 years) changes in hydrothermal activity induced by seismic events: Geofluids, v. 15, p. 252-268.

Crossey, L.J., Karlstrom, K.E., Schmandt, B., Crow, R., Colman*, D., Cron*, B., Takacs-Vesbach, T.D., Dahm, C., Northup, D.E., Hilton, D.R., Ricketts*, J.R., Lowry, A.R., 2016, Continental smokers couple mantle degassing and unique microbiology within continents: Earth and Planetary Science Letters, v. 435, p. 22-30,

Mohammed*, A.M., Krishnamurthy, R.V., Kehew, A.E., Crossey, L.J., Karlstrom, K., 2016. Factors affecting the stable isotopes ratios in groundwater impacted by intense agricultural practices: A case study from the Nile Valley of Egypt: Science of The Total Environment, v. 573, p. 707-715,

Rodriguez-Freire, L., Avasarala, S., Ali, A.M.S., Agnew, D., Hoover, J.H., Artyushkova, K., Latta, D.E., Peterson, E.J., Lewis, J., Crossey, L.J. and Brearley, A.J., 2016. Post Gold King Mine spill investigation of metal stability in water and sediments of the Animas River watershed. Environmental science & technology, v. 50(21), p.11539-11548. DOI: 10.1021/acs.est.6b03092.

Karlstrom, K.E., Crossey, L.J., Embid*, E., Crow*, R., Heizler, M., Hereford, R., Beard, L.S., Ricketts*, J.W., Cather, S., Kelley, S., 2017, Cenozoic incision history of the Little Colorado River: its role in carving Grand Canyon and onset of rapid incision in the last ~2 Ma in the Colorado River System: Geosphere, CRevolution volume, v. 13, no. 1, p. 49-81 doi:10.1130/GES01304.1.

Love, A.J., Shand, P., Fulton, S., Wohling, D., Karlstrom, K.E., Crossey, L., Rousseau-Gueutin, P. and Priestley, S.C., 2017. A Reappraisal of the Hydrogeology of the Western Margin of the Great Artesian Basin: Chemistry, Isotopes and Groundwater Flow. Procedia Earth and Planetary Science, v. 17, p.428-431.

Mulder, J.A., Karlstrom, K.E., Fletcher, K., Heizler, M.T., Timmons, J.M., Crossey, L.J., Gehrels, G.E. and Pecha, M., 2017. The syn-orogenic sedimentary record of the Grenville Orogeny in southwest Laurentia. Precambrian Research, v. 294, p.33-52.

Dehler, C., Gehrels, G., Porter, S., Heizler, M., Karlstrom, K., Cox, G., Crossey, L. and Timmons, M., 2017. Synthesis of the 780–740 Ma Chuar, Uinta Mountain, and Pahrump (ChUMP) groups, western USA: Implications for Laurentia-wide cratonic marine basins. Geological Society of America Bulletin, v. 129(5-6), p.607-624.

Priestley, S.C., Karlstrom, K.E., Love, A.J., Crossey, L.J., Polyak, V.J., and Asmerom, Y., 2018. Uranium series dating of Great Artesian Basin travertine deposits: Implications for palaeohydrogeology and palaeoclimatology: Palaeogeography, Palaeoclimatology, Palaeoecology v. 490, p. 163-177.

Crow, R.S., Karlstrom, K.E., Crossey, L.J., Polyak, V.J., Asmerom, Y. and McIntosh, W.C., 2018. Carving Grand Canyon’s inner gorge: A test of steady incision versus rapid knickzone migration. Geosphere, v. 14, DOI 10.1130/GES01562.1.

Karlstrom, K., Hagadorn, J., Gehrels, G., Matthews, W., Schmitz, M., Madronich, L., Mulder, J., Pecha, M., Giesler, D. and Crossey, L., 2018. Cambrian Sauk transgression in the Grand Canyon region redefined by detrital zircons. Nature Geoscience, v. 11, p. 438-443.

McGibbon, C., Crossey, L.J., Karlstrom, K.E. and Grulke, T., 2018. Carbonic springs as distal manifestations of geothermal systems, highlighting the importance of fault pathways and hydrochemical mixing: Example from the Jemez Mountains, New Mexico. Applied Geochemistry, v. 98, p. 48-57.

Abotalib, A.Z., Sultan, M., Jimenez, G., Crossey, L., Karlstrom, K., Forman, S., Krishnamurthy, R.V., Elkadiri, R. and Polyak, V., 2019. Complexity of Saharan paleoclimate reconstruction and implications for modern human migration. Earth and Planetary Science Letters, 508, pp.74-84.


The Grand Canyon Trail of Time Companion, Karlstrom, K. and Crossey, L. (2019).

Diagenesis and Fluid Flow: Concepts and Applications, eds. L. Crossey, R. Loucks, and M. Totten, Society for Sedimentary Geology, Special Publication 55, 222 p. (1996)

Aqueous Chemistry and Geochemistry of Oxides, Oxyhydroxides, and Related Materials, eds. Voight, J., Wood, T., Bunker, B., Casey, W., and Crossey, L., Materials Research Society, vol. 432 from the MRS Proceedings Series (1997).

Post-Doctoral Supervision
Larry Smith, 1989-1990; John Morrice (1996), Jennifer Loomis, 1997-1999; Jason Ricketts (Co); Ryan Crow (2014-2015)

Doctoral Students Advised
Advisor–P. Longmire (Co-Chair; 1991), P. Eberly (Co-Chair), *D. Larsen (Chair, 1994), J. Loomis (Chair, 1996), D. Bergfeld (Co-Chair, 2001), A. Groffman (Chair, 2002), A. McLain (Co-Chair), B. Faulkner (Co-Chair, 2006), *D. Newell (Co-Chair, 2007), *M. Kirk (Chair, 2008), A. Priewisch (2014), Becky Frus (2015), Chris McGibbon (current).

Masters Students Advised
Advisor– P. McCarville (1994), K. Roche (1998), L. Hagan (2000), Susan Block (2002), *David Vinson (2002), Ron Amato (MWR, 2004), Tom Loveland (2004), Eileen Embid (2009), James Dyer (MWR,2006), Jan Curtis (MWR, 2009), Jessica Lopez Pearce (2010), *Amy Williams (2009), Elizabeth Premo (2012), *Ara Kooser (2011), *Brandi Cron (2011), Lauren Sherson (2012), April Tafoya (2012), Gloria Jimenez (2014), Pavel Vakhlamov (2019), Christopher McGibbon (2015), Valerie Blomgren (2016), Jared Smith (2016), Jon Golla (2019), Christine Fergusen (co-advisor; current), Ben Holt (2018; co-advisor), Jordan Anderson (co-advisor: current), Matthew Nellesson (co-advisor; current), Naomi Delay (current)