JoAnn Holloway


Soil is the basis for terrestrial ecosystems, influencing  vegetation patterns and water quality.  JoAnn Holloway is a biogeochemist with research interests exploring the influence of parent material, geomorphology and hydrologic processes on soil biogeochemistry.  These processes are evaluated in the context of how land use, including historic mining, urbanization, forestry and agricultural practices can influence soil and water quality.  Her background in hydrology, geology, geochemistry, pedology and soil microbiology provides the basis for interdiscipline collaborations to evaluate the impact of land use and natural disasters (e.g., hurricane surge, wildfires) on soil and water quality.



Ph.D. Hydrologic Sciences, University of California at Davis, 1999

Dissertation:  Influence of Bedrock Weathering on Nitrogen Cycling in a Sierra Nevada Watershed

Advisor:  Randy Dahlgren


M.S. Geology, Western Washington University, 1993

Thesis:  Geochemical Interactions in a Subalpine Watershed, Mount Baker National Recreation Area, Washington


B.S. Geology, University of Utah, 1990

Senior Thesis:  Mineralization and Geochemistry of the Escalante Silver Mine, Iron County, Utah


Professional Experience


Research Geologist, 2005 - present

U.S. Geological Survey, Crustal Geophysics and Geochemistry Science Center; Denver, CO


Research Geologist (Mendenhall Postdoctoral Fellow) 2003-2005

U.S. Geological Survey, Crustal Imaging and Characterization Team; Denver, CO


Lecturer, Spring Semester 2003

"Environmental Microbiology", Department of Civil, Environmental and Architectural Engineering, University of Colorado, Boulder, CO


Research Hydrologist (National Research Council Postdoctoral Fellow) 1999-2001

U.S. Geological Survey, National Research Program; Boulder, CO



Holloway, J.M., Nordstrom, D.K., Böhlke, J.K., McCleskey, R.B., and Ball, J.W., 2011, Ammonium in thermal waters of Yellowstone National Park: Processes affecting speciation and isotopic fractionation.Geochimica et Cosmochimica Acta 75, 4611-4636. [Link]

Holloway, J.M., Goldhaber, M.B. and Mills, C. T., 2011, Carbon and nitrogen biogeochemistry in a Prairie Potholes wetland, Stutsman County, North Dakota: Applied Geochemistry 26, S44-S47. [Link]

Kokaly, R.F., Heckman, D, Holloway, J, Piazza, S., Couvillion, B., Steyer, G.D., Mills, C. and Hoefen, T.M., 2011, Shoreline surveys of oil-impacted marsh in southern Louisiana, July to August 2010: USGS OFR 2011–1022, 124 p. [Link]

Mills, C.T., Goldhaber, M.B., Holloway, J.M., Morrison, Ellefsen, K.J., Rosenberry, D.O., Thurston, R.S., 2011, Using stable isotopes to understand hydrochemical processes in and around a Prairie Pothole wetland in the Northern Great Plains, USA. Applied Geochemistry 26, S97-S100. [Link]

McCleskey, R.B., Nordstrom, D.K., Susong, D.D., Ball, J.W. and Holloway, J.M., 2010, Source and fate of inorganic solutes in the Gibbon River, Yellowstone National Park, Wyoming, USA. I. Low-flow discharge and major solute chemistry: J. Volcanology Geothermal Research 193 189-202. [Link]

Holloway, J.M. Goldhaber, M.B., and Morrison, J., 2009, Geomorphic controls on mercury accumulation in soils from an historically mined watershed, Central California Coast Range: Applied Geochemistry24, 1538-1548. [Link]

Holloway, J.M., Ewing, S.A. and Maher, K., 2009, Combined ecological and geologic perspectives in ecosystem studies: Chemical Geology 267, 3-4. [Link]

Holloway, J.M., Goldhaber, M.B., Scow, K.M. and Drenovsky, R., 2009, Spatial and seasonal variations in mercury methylation and microbial community structure in an historic mercury mining area, Yolo County, California: Chemical Geology 267, 85-95. [Link]

Morrison, J.M., Goldhaber, M.B, Lee, L., Holloway, J. M., Wanty, R. B., Wolf, R. E. and Ranville, J. F., 2009, A regional-scale study of chromium and nickel in soils of northern California, USA. Applied Geochemistry 24, 1500- 1511 [Link]

Goldhaber, M.B., Morrison, J.M., Holloway, J.M., Wanty, R.B., Helsel, D.R., & Smith, D.B., 2009, A regional soil and sediment geochemical study in northern California. Applied Geochemistry 24, 1482-1499. [Link]

Morrison, Jean M.; Goldhaber, Martin B.; Holloway, JoAnn M.; Smith, David B., 2008, Major- and Trace-Element Concentrations in Soils from Northern California: Results from the Geochemical Landscapes Project Pilot Study. Geological Survey (U.S.) Open-File Report 2008-1306, iv, 7 p. [Link]

Ball, James W.; McCleskey, R. Blaine; Nordstrom, D. Kirk; Holloway, JoAnn M., 2008. Water-Chemistry Data for Selected Springs, Geysers, and Streams in Yellowstone National Park, Wyoming, 2003-2005. Geological Survey (U.S.) Open-File Report 2006-1339, viii, 137 p. [Link]

McCleskey, R. Blaine; Ball, James W.; Nordstrom, D. Kirk; Holloway, JoAnn M.; Taylor, Howard E., 2005, Water-chemistry data for selected springs, geysers, and streams in Yellowstone National Park Wyoming, 2001-2002. Open-File Report 2004-1316, 94 p. [Link]

Ludington, Steve; Plumlee, Geoff; Caine, Jonathan; Bove, Dana; Holloway, JoAnn; Livo, Eric , 2005, Questa baseline and pre-mining ground-water quality investigation. 10. Geologic influences on ground and surface waters in the lower Red River watershed, New Mexico. Scientific Investigations Report 2004-5245, 46 p. [Link]

Holloway, J. M. & Smith, R. L., 2005, Nitrogen and carbon flow from rock to water: regulation through soil biogeochemical processes, Mokelumne River watershed, California and Grand Valley, Colorado,JGR - Earth Surface Processes 100, F1, F01010, 10.1029/2004JF000240. [Link]

Holloway, J.M., Nordstrom, D.K., Smith, R.L., 2004, Nitrogen transformations in hot spring runoff, Yellowstone National Park, WY, Water-Rock Interaction 11, Saratoga Springs, NY, June 2004, Wanty, R. B. & R. R. Seal II, eds. A. A. Balkema, 145-148.

Ball, James W.; McCleskey, R. Blaine; Nordstrom, D. Kirk; Holloway, JoAnn M.; Verplanck, Philip L.; Sturtevant, Sabin A., 2002, Water-Chemistry Data for Selected Springs, Geysers, and Streams in Yellowstone National Park, Wyoming, 1999-2000. Open-File Report 2002-382, 104 p. [Link]

Holloway, J. M. & Dahlgren, R. A., 2002, Nitrogen in rock: occurrences and biogeochemical implications. Global Biogeochemical Cycles 16, 1118, doi: 10.1029/2002GB001862, 65.1-65.17 [Link]

Holloway, J. M., Dahlgren, R. A., & Casey, W. H., 2001, Nitrogen release from rock and soil under simulated field conditions: Chemical Geology 174, 403-414. [Link]

Holloway, J. M. & Dahlgren, R. A., 2001, Seasonal and event-scale variations in solute chemistry for four Sierra Nevada Catchments: Journal of Hydrology 250, 106-121. [Link]

Holloway, J. M. & Dahlgren, R. A., 1999, Geologic nitrogen in biogeochemical cycling: Geology 27, 567-570. [Link]

Holloway, J. M., Dahlgren, R. A., Hansen, B. & Casey, W. H., 1998, Contribution of bedrock nitrogen to high nitrate concentrations in stream water: Nature 395, 785-788. [Link]

Holloway, J.M. & Petersen, E.U., 1991 Mineralization and geochemistry of the Escalante silver mine, Iron County, Utah: (ed., Allison, M. Lee et al.) Utah Geological Association Publication 18, p 83-95.