Publications
Williams, J.C., Brookfield, M.E., Stebbins, A. 2021. Geochemical changes across a marginal marine Permo-Triassic boundary section on the Adria carbonate platform at Brsnina, Slovenia., Slovenia. International Journal of Earth Sciences (110) 923–942.
link.springer.com/article/10.1007%2Fs00531-021-01999-w
Brookfield, M.E., Williams, J.C., Stebbins, A. 2021. Palaeoenvironments and geochemistry of the Permo-Triassic boundary section at Balvenny North, Bűkk Mountains, Hungary. Geoscience Frontiers Sciences, 12(3).
https://doi.org/10.1016/j.gsf.2020.09.021
Brookfield, M. E., Williams, J.C, Stebbins, A.G. 2020. Geochemistry of the new Permian-Triassic boundary section at Sitarička Glavica, Jadar block, Serbia. Chemical Geology, (550)
www.sciencedirect.com/science/article/abs/pii/S0009254120302357?via%3Dihub
Brookfield, M.E., Stebbins, A., Williams, J., Wolbach, W., Hannigan, R., Bhat, G.M. 2020. Little change in elemental geochemistry across the marine Permian-Triassic boundary section, Guryul ravine (Kashmir, India). Depositional Record, (6):75-116.
onlinelibrary.wiley.com/doi/full/10.1002/dep2.96
Williams, J.C., Simone, D. M., Buchanan, B., Boulanger, M.T., Bebber, M.R., Eren, M.I. 2019. Nine-thousand years of optimal toolstone selection through the North American Holocene. Antiquity, 93(368): 313-324.
www.cambridge.org/core/journals/antiquity/article/abs/ninethousand-years-of-optimal-toolstone-selection-through-the-north-american-holocene/5C940C8839212B0D43A0D0C30CD12F8F
Stebbins, A., Hannigan, R., Williams, J., Brookfield, M.E., Nye, S. 2019. Euxinic Intervals during the Upper Permian in the southern Neo-Tethys (Spiti Valley, India). Palaeogeography, Palaeoclimatology, Palaeoecology, (516):1-10.
www.sciencedirect.com/science/article/pii/S0031018218306370?casa_token=1YrSBrtQND0AAAAA:UDVUTb1XxTD58ISBz7THd6AkTpuujiQmOuOOucYar8nxaeyLaWSiSfv3q0H97Sjte1-UGcUSozA
Stebbins, A., Algeo, T.J., Krystyn, L., Rowe, H., Brookfield, M., Williams, J., Nye, S., Hannigan, R. 2019. The early Triassic marine sulfur cycle provides evidence of upwelling and eutrophic stresses during cooling stages. Earth-Science Reviews, (195):68-82.
www.sciencedirect.com/science/article/pii/S001282521830103X?casa_token=_nliU55JjLAAAAAA:2xfH7A1-ko0GpVQZegs8y6OiS88HvVx6mvLinrXxrrmodvAJxbm2gmMTi7BRGiU-oo9K51Qk8mw
Awatar, R., Tewari, R., Gautam, S., Goswami, S., Brookfield, M., Anihotri, D., Williams, J. 2018. Palynology of the Cyclolobus walker bed, Gungri Formation (Late Permian), Spiti Valley, Northwest Himalaya, India. Journal of the Palaeontological Society of India, 63(2): 141-154.
palaeontologicalsociety.in/vol63_dec/1.%20Gungri%20MS%20Final.pdf
Sudar, M.N., Kolar-Jurkovšek, T., Nestell, G.P., Jovanović, D., Jurkovšek, B., Williams, J.C, Brookfield, M.E., Stebbins, A.G. 2018. New results of microfaunal and geochemical investigations in the Permian-Triassic boundary interval from the Jadar Block (NW Serbia). Geologica Carpathica, 69(2).
www.geologicacarpathica.com/browse-journal/volumes/69-2/article-870/
Brookfield, M.E., Algeo T.J., Hannigan, R., Williams, J.C., Bhatt G.M. 2013. Shaken and Stirred: Seismites and Tsuamites at the Permian-Triassic Boundary, Guryul Ravine, Kashmir, India. PALAIOS, 2(8): 568-582.
pubs.geoscienceworld.org/sepm/palaios/article-abstract/28/8/568/146359/SHAKEN-AND-STIRRED-SEISMITES-AND-TSUNAMITES-AT-THE
Cuoco, E., Tedesco, D., Poreda, R. J., Williams, J. C., De Francesco, S., Balagizi, C., Darrah, T. H. 2013. Impact of volcanic plume emissions on rain water chemistry during the January 2010 Nyamuragira eruptive event: implications for essential potable water resources. Journal of Hazardous Materials, 244-245(15): 570-581.
www.sciencedirect.com/science/article/pii/S0304389412010722?casa_token=F3izOASZRlEAAAAA:_8Ap
UOqa4CIEhe7ZS3J_z4NplTYysyHtWruQPYWWWM50HxKURk65uJLSIMLJtgLaLUuH9Nzojk
Williams, J.C., Basu, A.R., Bhagarva, O.N., Ahluwalia, A.D., and Hannigan, R.E. 2012. Resolving original signature from a sea of overprint-The geochemistry of the Gungri Shale (Upper Permian, Spiti Valley, India). Chemical Geology, 324: 59-72.
www.sciencedirect.com/science/article/pii/S0009254112000484?casa_token=iupkB-OykEcAAAAA:JsN4YH3ruCZ6ggu75iSkfePesOcGf7CdMBlVb5uNbRrPyio1qPxdb604yr_FPTRsZM50HrFW8bo
Alizai, A., Carter, A., Clift, P. D., VanLaningham, S., Williams, J.C., and Kumar, R. 2011. Sediment provenance, reworking and transport processes in the Indus River by U–Pb dating of detrital zircon grains. Global and Planetary Change, 76(1-2): 33-55.
www.sciencedirect.com/science/article/abs/pii/S0921818110002559?via%3Dihub
link.springer.com/article/10.1007%2Fs00531-021-01999-w
Brookfield, M.E., Williams, J.C., Stebbins, A. 2021. Palaeoenvironments and geochemistry of the Permo-Triassic boundary section at Balvenny North, Bűkk Mountains, Hungary. Geoscience Frontiers Sciences, 12(3).
https://doi.org/10.1016/j.gsf.2020.09.021
Brookfield, M. E., Williams, J.C, Stebbins, A.G. 2020. Geochemistry of the new Permian-Triassic boundary section at Sitarička Glavica, Jadar block, Serbia. Chemical Geology, (550)
www.sciencedirect.com/science/article/abs/pii/S0009254120302357?via%3Dihub
Brookfield, M.E., Stebbins, A., Williams, J., Wolbach, W., Hannigan, R., Bhat, G.M. 2020. Little change in elemental geochemistry across the marine Permian-Triassic boundary section, Guryul ravine (Kashmir, India). Depositional Record, (6):75-116.
onlinelibrary.wiley.com/doi/full/10.1002/dep2.96
Williams, J.C., Simone, D. M., Buchanan, B., Boulanger, M.T., Bebber, M.R., Eren, M.I. 2019. Nine-thousand years of optimal toolstone selection through the North American Holocene. Antiquity, 93(368): 313-324.
www.cambridge.org/core/journals/antiquity/article/abs/ninethousand-years-of-optimal-toolstone-selection-through-the-north-american-holocene/5C940C8839212B0D43A0D0C30CD12F8F
Stebbins, A., Hannigan, R., Williams, J., Brookfield, M.E., Nye, S. 2019. Euxinic Intervals during the Upper Permian in the southern Neo-Tethys (Spiti Valley, India). Palaeogeography, Palaeoclimatology, Palaeoecology, (516):1-10.
www.sciencedirect.com/science/article/pii/S0031018218306370?casa_token=1YrSBrtQND0AAAAA:UDVUTb1XxTD58ISBz7THd6AkTpuujiQmOuOOucYar8nxaeyLaWSiSfv3q0H97Sjte1-UGcUSozA
Stebbins, A., Algeo, T.J., Krystyn, L., Rowe, H., Brookfield, M., Williams, J., Nye, S., Hannigan, R. 2019. The early Triassic marine sulfur cycle provides evidence of upwelling and eutrophic stresses during cooling stages. Earth-Science Reviews, (195):68-82.
www.sciencedirect.com/science/article/pii/S001282521830103X?casa_token=_nliU55JjLAAAAAA:2xfH7A1-ko0GpVQZegs8y6OiS88HvVx6mvLinrXxrrmodvAJxbm2gmMTi7BRGiU-oo9K51Qk8mw
Awatar, R., Tewari, R., Gautam, S., Goswami, S., Brookfield, M., Anihotri, D., Williams, J. 2018. Palynology of the Cyclolobus walker bed, Gungri Formation (Late Permian), Spiti Valley, Northwest Himalaya, India. Journal of the Palaeontological Society of India, 63(2): 141-154.
palaeontologicalsociety.in/vol63_dec/1.%20Gungri%20MS%20Final.pdf
Sudar, M.N., Kolar-Jurkovšek, T., Nestell, G.P., Jovanović, D., Jurkovšek, B., Williams, J.C, Brookfield, M.E., Stebbins, A.G. 2018. New results of microfaunal and geochemical investigations in the Permian-Triassic boundary interval from the Jadar Block (NW Serbia). Geologica Carpathica, 69(2).
www.geologicacarpathica.com/browse-journal/volumes/69-2/article-870/
Brookfield, M.E., Algeo T.J., Hannigan, R., Williams, J.C., Bhatt G.M. 2013. Shaken and Stirred: Seismites and Tsuamites at the Permian-Triassic Boundary, Guryul Ravine, Kashmir, India. PALAIOS, 2(8): 568-582.
pubs.geoscienceworld.org/sepm/palaios/article-abstract/28/8/568/146359/SHAKEN-AND-STIRRED-SEISMITES-AND-TSUNAMITES-AT-THE
Cuoco, E., Tedesco, D., Poreda, R. J., Williams, J. C., De Francesco, S., Balagizi, C., Darrah, T. H. 2013. Impact of volcanic plume emissions on rain water chemistry during the January 2010 Nyamuragira eruptive event: implications for essential potable water resources. Journal of Hazardous Materials, 244-245(15): 570-581.
www.sciencedirect.com/science/article/pii/S0304389412010722?casa_token=F3izOASZRlEAAAAA:_8Ap
UOqa4CIEhe7ZS3J_z4NplTYysyHtWruQPYWWWM50HxKURk65uJLSIMLJtgLaLUuH9Nzojk
Williams, J.C., Basu, A.R., Bhagarva, O.N., Ahluwalia, A.D., and Hannigan, R.E. 2012. Resolving original signature from a sea of overprint-The geochemistry of the Gungri Shale (Upper Permian, Spiti Valley, India). Chemical Geology, 324: 59-72.
www.sciencedirect.com/science/article/pii/S0009254112000484?casa_token=iupkB-OykEcAAAAA:JsN4YH3ruCZ6ggu75iSkfePesOcGf7CdMBlVb5uNbRrPyio1qPxdb604yr_FPTRsZM50HrFW8bo
Alizai, A., Carter, A., Clift, P. D., VanLaningham, S., Williams, J.C., and Kumar, R. 2011. Sediment provenance, reworking and transport processes in the Indus River by U–Pb dating of detrital zircon grains. Global and Planetary Change, 76(1-2): 33-55.
www.sciencedirect.com/science/article/abs/pii/S0921818110002559?via%3Dihub
Presentations
INVITED PRESENTATIONS
2021
Williams, J.C., Understanding the Inevitable: The Great Dying Event. Department of Geological Sciences, Ohio University, February 19, 2021
Williams, J.C., Understanding the Inevitable: The Great Dying Event. Department of Geology and Geological Engineering, University of Mississippi, February 1, 2021
Williams, J.C., Understanding the Inevitable: The Great Dying Event. School of Earth Sciences, The Ohio State University, January 22, 2021
2020
Williams, J.C. Sulfur Isotopes and Framboidal Pyrite: Understanding the severity of oxygenation in the Permo-Triassic Extinction. Department of Geology, University of Kansas, Isotope Class, October 30, 2020.
2019
Williams, J.C., Brookfield, M.E., Stebbins, A.G., Nye, S., Hannigan, R. Understanding the consequences of C-perturbation during the Permian-Triassic Extinction through trace elemental proxies. Deep Carbon Observatory Conference. Washington, D.C., USA October 24-27
2018
Williams, J.C., Stebbins, A., Brookfield, M., Hannigan, R. Understanding the Major Perturbations in the C-cycle through stable isotopes during the Permian-Triassic Extinction. The International Carbon Conference- Deep Carbon Observatory: Catastrophic Perturbations Workshop. Reykjavík, Iceland, September 10-14 (oral)
Williams, J.C., Stebbins, A., Brookfield, M., Sudar, M., Kolar-Jurkovsek, T., Nestell, G., Jovanovic, D., Jurkovsek, B., Hannigan, R. Linking changes in the δ13C record to geochemical phenomenon in the Sitaricka Glavica Permo-Triassic Section: Understanding the causes of major perturbations in C-cycle. Deep Carbon Science, Gordon Research Conference, Bryant University, Smithfield, RI June 17-22 (poster)
2017
Williams, J.C. Utilizing Geochemical Techniques in Understanding the Permian-Triassic Extinction. Department of Earth and Space Sciences Seminar Series, West Chester University, West Chester, PA, April 21 (oral)
Williams, J.C. Utilizing Geochemical Techniques in Understanding the Permian-Triassic Extinction. Department of Geology Seminar Series, Cleveland State University, Cleveland, OH, March 31 (oral)
Williams, J.C., Darrah, T.D., Koons, R.C., Stebbins, A.G., Hannigan, R. Understanding the depositional conditions of the Union Springs and Oatka Creek members of the Marcellus Formation: Are they different. Deep Carbon Observatory, 3rd DCO International Science Meeting, St. Andrews, Scotland, March 23-25 (poster)
Williams, J.C. Mass Extinctions and Climate Change in Geological Time. Lunch and learn at the Virginia Aquarium. Virginia Aquarium, Virginia Beach, February 24 (oral)
Williams, J.C. 50 Shades of Black Shale and Biofacies Analysis. Hampton University Marine and Environmental Science Seminar, Hampton University, Hampton, VA, February 23 (oral)
2016
Williams, J.C. Utilizing Geochemical Techniques in Understanding the Permian-Triassic Extinction. Department of Geology Seminar Series, Case-Western Reserve University, Cleveland, OH, March 31 (oral)
2015
Williams, J.C. Paleoenvironments of the Permian-Triassic extinction: Through the scope of geochemistry. Palmer Geology Lecture Series, The Department of Geology, Kent State University, Kent, OH, January 16 (oral)
2014
Williams, J.C. Black Shales through Time: Understanding Their Significance from a Geological Perspective. School of Earth Science Seminar Series, The Ohio State University, Columbus, OH, September 11 (oral)
WORKSHOPS
2019
Batchelor, R.L., King, B., Habtes, S., Kirsch, R., Williams, J. Sparks for Change: Advancing Leadership for Broadening Participation of Underrepresented Faculty. Pre-Conference Workshop. Association of American Colleges & Universities: Transforming STEM Higher Education. Chicago, Il, November 7-9 (workshop).
ABSTRACT PRESENTATIONS
2020
Lewis, A.R., Bebber, M.R., Eren, M., Williams, J.C., and Ortiz, J.D. Visual derivative spectroscopy as a quantitative approach to analyze the non-silica component of high silica chert stone tools. Geological Society of America (GSA) Connects Online, October 2020 (oral)
2019
Williams, J.C. Breaking the Barrier of Fear and Geochemistry. University Teaching Counsel Celebrating Teaching Conference 2019 Meeting, Kent State University, Kent, OH, USA October 25 (poster)
Lewis, A.R., Bebber, M.R., Metin, E., Williams, J.C. Major Elemental Characterization of Chert Stone Tools from the Welling Site and Northern Ohio. Geological Society of America Conference 2019 Meeting, Phoenix, AZ, USA September 22-25 (poster)
2018
Williams, J.C., Ice, B, Ortiz, J. Using Visible Derivative Spectroscopy to Identify Composition and Periodicity in Black Shales in the Middle Devonian. American Geophysical Union Conference 2018 Meeting, Washington, D.C., USA December 10-14 (poster)
Ice, B., Williams, J.C., Reconstructing the Middle Devonian Paleoclimate Using Black Shale Geochemistry. Geological Society of America Conference 2018 Meeting, Indianapolis, IN, USA November 4-7 (poster)
Simone, D., Bebber, M., Metin, E., Williams, J.C. Geochemistry, Provenance, and Cultural Significance of Chert Stone Tools, Coshocton County, Ohio. Geological Society of America Conference 2018 Meeting, Indianapolis, IN, USA November 4-7 (oral)
Williams, S., Koons, R., Williams, J.C. Using Geochemical Proxies to Measure Preservation of Organic Matter in the Marcellus Formation. Geological Society of America Conference 2018 Meeting, Indianapolis, IN, USA November 4-7 (poster)
Ice, B., Williams, J.C., Reconstructing the Middle Devonian Paleoclimate Using Black Shale Geochemistry. Goldschmidt Conference 2018 Meeting, Boston, MA, USA August 13-17 (poster)
2018
Koons, R., Williams, J.C., Discrepancy of Organic Richness within the Oatka Creek and Union Springs of the Marcellus Formation. Goldschmidt Conference 2018 Meeting, Boston, MA, USA August 13-17 (poster)
Williams, J.C. Does “hands-on” learning promote proficiency, competence in analytical instrumentation and statistics in a Geology Classroom? Kent State University Teaching Scholars Colloquium. Kent State University, Kent, OH, USA April 26 (poster)
2017
Sudar, M.N., Kolar-Jurkovšek, T., Nestell, G.P., Jovanović, D., Jurkovšek, B., Williams, J.C, Brookfield, M.E., Stebbins, A.G. New results of microfaunal and geochemical investigations in the Permian-Triassic boundary interval from the Jadar Block (NW Serbia). Alpine Geological Studies, Zlatibor Mt., Serbia, September 7-18 (oral)
Williams, J.C., Stebbins, A., Brookfield, M., Sudar, M. N., Kolar-Jurkovšek, T., Nestell, G.P., Jovanović, D., Jurkovšek, B. Geochemistry of the new Permo-Triassic boundary at Sitarička Glavica, Vljevo, Serbia: no major changes in oxygen content across the boundary. Zlatibor Meeting Alpine Geological Studies, Zlatibor Mt., Serbia, September 7-18 (oral)
2016
Stebbins, A., Williams, J.C., Brookfield, M., Hannigan, R. Reconstruction of bottom-water oxygenation conditions in the Late Permian Neo-Tethys. Goldschmidt Conference, Tokyo, Japan June 26- July 1 (oral)
Stebbins, A.G., Williams, J.C., Brookfield, M.E., Hannigan, R. Refining oxygenation conditions in the Late Permian of Spiti Valley, India. Geological Society of America Annual Meeting, Denver, Co, USA September 25-28 (oral)
2015
Williams, J.C., Darrah, T. H., Poreda, S., Whyte. C., Stebbins, A.G., Hannigan, R. Are Union Springs and Oatka Creek members of the Marcellus Formation formed under different depositional conditions? Geological Society of America Annual Meeting, Baltimore, MD, USA, November 1-4 (oral)
Stebbins, A., Algeo, T., Hart, R., Krystyn, L., Williams, J., Brookfield, M., Hannigan, R. The early Triassic sulfur isotope curve of seawater sulfate from marine carbonates in the Neo-Tethys. Goldschmidt Conference 2015 Meeting, Prague, Czech Republic, August 16-21 (oral)
Harrington, J., Muehlenbachs, K., Whyte, C., Williams, J.C., Darrah, T. Integrating noble gas and compound-specific stable isotopes to characterize the generation and migration of oil-associated gases and H2S in the Eagle Ford shale of Texas, USA. Goldschmidt Conference 2015 Meeting, Prague, Czech Republic, August 16-21 (oral)
Hart, R., Stebbins, A., Brookfield, M., Williams, J., Hannigan, R. Characterizing the end-Permian mass extinction in the neo-Tethys through organic geochemistry. Goldschmidt Conference 2015 Meeting, Prague, Czech Republic, August 16-21 (oral)
2014
Williams, J.C., Darrah. T. H., Koons, R., Hannigan, R. The paleoenvironment of the Marcellus Formation: Implication for understanding the origin of unconventional oil and gas reservoirs. Geological Society of America Annual Meeting, Vancouver, British Columbia, Canada, October 19-22 (oral)
Brourman, H., Darrah, T.H., Williams. J.C., Olesik, J., Poreda, R. Noble gas geochemistry of the Marcellus Shale Formation: A prospecting tool for hydrocarbon gas migration. Geological Society of America Annual Meeting, Vancouver, British Columbia, Canada, October 19-22 (oral)
Santistevan, A., Algeo, T.J., Hannigan, R., Williams, J.C. The role of the Siberian Traps in the Permian-Triassic Extinction: Analysis through chemical fingerprinting of marine sediments using rare earth elements (REEs). Geological Society of America Annual Meeting, Vancouver, British Columbia, Canada, October 19-22 (oral)
Williams, J.C., Darrah, T.H., Johannesson, K, Stebbins, A.G, Hannigan, R. Rare earth elements as a proxy for redox conditions in black shales? Goldschmidt Conference 2014 Meeting, Sacramento, CA June 8- 13 (oral)
Darrah, T.H., Williams, J.C. Understanding the trace element composition of modern human bone. Goldschmidt Conference 2014 Meeting, Sacramento, CA June 8-13 (oral)
2013
Williams, J.C., Stebbins, A., Sudar, M., Jovanovic, D., Brookfield, M., Algeo, T., Berman, M., Hannigan, R. The geochemistry of a newly discovered permo-triassic section in Serbia: A tale of catastrophic events. American Geophysical Union (AGU) Fall 2013 Meeting, San Francisco, CA, December 9-13 (poster)
Brookfield, M., Algeo, T., Hannigan, R., Williams, J.C., Bhat, G.M. The great end Permian tsunamis: recognition, extent and generation. American Geophysical Union (AGU) Fall 2013 Meeting, San Francisco, CA, December 9-13 (poster)
Stebbins, A., Holmes, S., Fernandes, M., Williams, J.C., Hannigan, R. Utilizing pyritic δ34S to characterize the depositional conditions of the Neo-Tethys in the late Permian. American Geophysical Union (AGU) Fall 2013 Meeting, San Francisco, CA, December 9-13 (oral)
Williams, J.C., Sudar, M., Jovanovic, D., Brookfield, M.E. Geochemistry and sedimentology of a new Permo-Triassic boundary section in Serbia. International Geoscience Program (IGCP) 572 World Summit on P-Tr Mass Extinction and Climate Change, Wuhan, China June 14. (oral)
Stebbins, A., Fernandes, G., Williams, J.C., Hannigan, R. Utilizing C-S-Fe systematics to determine bottom water oxygenation conditions of the Neo-Tethys. International Geoscience Program (IGCP) 572 World Summit on P-Tr Mass Extinction and Climate Change, Wuhan, China, June 14. (oral)
Williams, J.C., Hannigan, R., Basu, A. R., Ghosh, N., Brookfield, M.E., Stebbins, A. Episodic changes in the geochemical record of the Late Permian: Spiti Valley, Himachal Pradesh, Himalaya. International Geoscience Program (IGCP) 572 World Summit on P-Tr Mass Extinction and Climate Change, Wuhan, China, June 13. (oral)
Santistevan, F., Algeo, T. J., Hannigan, R., Williams, J.C. The role of the Siberian Traps in the Permian-Triassic mass extinction: Analysis through chemical fingerprinting of marine sediments using rare earth elements (REEs). Geological Society of America North-Central Section 47th Annual Meeting, Kalamazoo, MI, May 2. (oral)
2012
Etienne, E.D., Hannigan, R, Williams, J.C. Accounting for variations of delta-13-c isotopic record at the Lingti Permian-Triassic Section. Geological Society of America Annual Meeting, Charlotte, NC, Nov 6. (poster)
Williams, J.C., Hannigan, R., Basu, A. R., Ghosh, N., Brookfield, M., Etienne, E.D. Using stable light isotopes to identify environmental changes in the Neo-Tethys ocean during the Permian-Triassic Extinction. Geological Society of America Annual Meeting, Charlotte, NC, Nov 4. (oral)
Williams. J.C., Hannigan, R., Basu, A.R., Ghosh, N., Brookfield, M. Accounting for Post-Depositional Effects on a Neo-Tethyan Permian- Triassic Section in the Himalayan Mountains. Goldschmidt Conference, Montreal, QC, Canada, June 28. (oral)
2011
Williams, J.C., Basu, A.R., Bhagarva, O.N., Ahluwalia, A.D., Hannigan, R. A paleo-environmental analysis of the Attargoo Permo-Triassic Section: a neo-Tethyan section. XVII International Congress on the Carboniferous and Permian, Perth, Australia, July 6 (oral)
Brookfield, M. E., Hannigan R., Algeo, T., Williams. J.C. Sedimentology and geochemistry of the Permo-Triassic boundary section at Guryul Ravine, Kashmir, India; a comparison of the with the Texas Cretaceous- Tertiary boundary section. XVII International Congress on the Carboniferous and Permian, Perth, Australia, July 5 (oral)
2010
Williams, J.C., Ripley-Daniels, H.S. Science Enrichment: Bridging the gap between elementary school science and graduate research scientist. NSF Graduate Stem Fellows in K-12 Education Annual Conference, Washington D.C., March 27 (poster)
2009
Williams, J.C., Layton, A., Kammler, B., Polk, A., Shelton, J., Gray, K. Assessing the impacts of humans on the Tyronza River: A human agriculturally dominated watershed. American Society of Limnology and Oceanography (ASLO) Aquatic Science Meeting, Nice, France January 27, 2009 (oral)
2008
Williams, J.C., Czajkowski, K., Hayase, R. Impacts of land cover and usage on water quality in western Lake Erie watersheds. American Society of Limnology and Oceanography (ASLO) Ocean Science Meeting, Orlando, FL March 5 (poster)
2021
Williams, J.C., Understanding the Inevitable: The Great Dying Event. Department of Geological Sciences, Ohio University, February 19, 2021
Williams, J.C., Understanding the Inevitable: The Great Dying Event. Department of Geology and Geological Engineering, University of Mississippi, February 1, 2021
Williams, J.C., Understanding the Inevitable: The Great Dying Event. School of Earth Sciences, The Ohio State University, January 22, 2021
2020
Williams, J.C. Sulfur Isotopes and Framboidal Pyrite: Understanding the severity of oxygenation in the Permo-Triassic Extinction. Department of Geology, University of Kansas, Isotope Class, October 30, 2020.
2019
Williams, J.C., Brookfield, M.E., Stebbins, A.G., Nye, S., Hannigan, R. Understanding the consequences of C-perturbation during the Permian-Triassic Extinction through trace elemental proxies. Deep Carbon Observatory Conference. Washington, D.C., USA October 24-27
2018
Williams, J.C., Stebbins, A., Brookfield, M., Hannigan, R. Understanding the Major Perturbations in the C-cycle through stable isotopes during the Permian-Triassic Extinction. The International Carbon Conference- Deep Carbon Observatory: Catastrophic Perturbations Workshop. Reykjavík, Iceland, September 10-14 (oral)
Williams, J.C., Stebbins, A., Brookfield, M., Sudar, M., Kolar-Jurkovsek, T., Nestell, G., Jovanovic, D., Jurkovsek, B., Hannigan, R. Linking changes in the δ13C record to geochemical phenomenon in the Sitaricka Glavica Permo-Triassic Section: Understanding the causes of major perturbations in C-cycle. Deep Carbon Science, Gordon Research Conference, Bryant University, Smithfield, RI June 17-22 (poster)
2017
Williams, J.C. Utilizing Geochemical Techniques in Understanding the Permian-Triassic Extinction. Department of Earth and Space Sciences Seminar Series, West Chester University, West Chester, PA, April 21 (oral)
Williams, J.C. Utilizing Geochemical Techniques in Understanding the Permian-Triassic Extinction. Department of Geology Seminar Series, Cleveland State University, Cleveland, OH, March 31 (oral)
Williams, J.C., Darrah, T.D., Koons, R.C., Stebbins, A.G., Hannigan, R. Understanding the depositional conditions of the Union Springs and Oatka Creek members of the Marcellus Formation: Are they different. Deep Carbon Observatory, 3rd DCO International Science Meeting, St. Andrews, Scotland, March 23-25 (poster)
Williams, J.C. Mass Extinctions and Climate Change in Geological Time. Lunch and learn at the Virginia Aquarium. Virginia Aquarium, Virginia Beach, February 24 (oral)
Williams, J.C. 50 Shades of Black Shale and Biofacies Analysis. Hampton University Marine and Environmental Science Seminar, Hampton University, Hampton, VA, February 23 (oral)
2016
Williams, J.C. Utilizing Geochemical Techniques in Understanding the Permian-Triassic Extinction. Department of Geology Seminar Series, Case-Western Reserve University, Cleveland, OH, March 31 (oral)
2015
Williams, J.C. Paleoenvironments of the Permian-Triassic extinction: Through the scope of geochemistry. Palmer Geology Lecture Series, The Department of Geology, Kent State University, Kent, OH, January 16 (oral)
2014
Williams, J.C. Black Shales through Time: Understanding Their Significance from a Geological Perspective. School of Earth Science Seminar Series, The Ohio State University, Columbus, OH, September 11 (oral)
WORKSHOPS
2019
Batchelor, R.L., King, B., Habtes, S., Kirsch, R., Williams, J. Sparks for Change: Advancing Leadership for Broadening Participation of Underrepresented Faculty. Pre-Conference Workshop. Association of American Colleges & Universities: Transforming STEM Higher Education. Chicago, Il, November 7-9 (workshop).
ABSTRACT PRESENTATIONS
2020
Lewis, A.R., Bebber, M.R., Eren, M., Williams, J.C., and Ortiz, J.D. Visual derivative spectroscopy as a quantitative approach to analyze the non-silica component of high silica chert stone tools. Geological Society of America (GSA) Connects Online, October 2020 (oral)
2019
Williams, J.C. Breaking the Barrier of Fear and Geochemistry. University Teaching Counsel Celebrating Teaching Conference 2019 Meeting, Kent State University, Kent, OH, USA October 25 (poster)
Lewis, A.R., Bebber, M.R., Metin, E., Williams, J.C. Major Elemental Characterization of Chert Stone Tools from the Welling Site and Northern Ohio. Geological Society of America Conference 2019 Meeting, Phoenix, AZ, USA September 22-25 (poster)
2018
Williams, J.C., Ice, B, Ortiz, J. Using Visible Derivative Spectroscopy to Identify Composition and Periodicity in Black Shales in the Middle Devonian. American Geophysical Union Conference 2018 Meeting, Washington, D.C., USA December 10-14 (poster)
Ice, B., Williams, J.C., Reconstructing the Middle Devonian Paleoclimate Using Black Shale Geochemistry. Geological Society of America Conference 2018 Meeting, Indianapolis, IN, USA November 4-7 (poster)
Simone, D., Bebber, M., Metin, E., Williams, J.C. Geochemistry, Provenance, and Cultural Significance of Chert Stone Tools, Coshocton County, Ohio. Geological Society of America Conference 2018 Meeting, Indianapolis, IN, USA November 4-7 (oral)
Williams, S., Koons, R., Williams, J.C. Using Geochemical Proxies to Measure Preservation of Organic Matter in the Marcellus Formation. Geological Society of America Conference 2018 Meeting, Indianapolis, IN, USA November 4-7 (poster)
Ice, B., Williams, J.C., Reconstructing the Middle Devonian Paleoclimate Using Black Shale Geochemistry. Goldschmidt Conference 2018 Meeting, Boston, MA, USA August 13-17 (poster)
2018
Koons, R., Williams, J.C., Discrepancy of Organic Richness within the Oatka Creek and Union Springs of the Marcellus Formation. Goldschmidt Conference 2018 Meeting, Boston, MA, USA August 13-17 (poster)
Williams, J.C. Does “hands-on” learning promote proficiency, competence in analytical instrumentation and statistics in a Geology Classroom? Kent State University Teaching Scholars Colloquium. Kent State University, Kent, OH, USA April 26 (poster)
2017
Sudar, M.N., Kolar-Jurkovšek, T., Nestell, G.P., Jovanović, D., Jurkovšek, B., Williams, J.C, Brookfield, M.E., Stebbins, A.G. New results of microfaunal and geochemical investigations in the Permian-Triassic boundary interval from the Jadar Block (NW Serbia). Alpine Geological Studies, Zlatibor Mt., Serbia, September 7-18 (oral)
Williams, J.C., Stebbins, A., Brookfield, M., Sudar, M. N., Kolar-Jurkovšek, T., Nestell, G.P., Jovanović, D., Jurkovšek, B. Geochemistry of the new Permo-Triassic boundary at Sitarička Glavica, Vljevo, Serbia: no major changes in oxygen content across the boundary. Zlatibor Meeting Alpine Geological Studies, Zlatibor Mt., Serbia, September 7-18 (oral)
2016
Stebbins, A., Williams, J.C., Brookfield, M., Hannigan, R. Reconstruction of bottom-water oxygenation conditions in the Late Permian Neo-Tethys. Goldschmidt Conference, Tokyo, Japan June 26- July 1 (oral)
Stebbins, A.G., Williams, J.C., Brookfield, M.E., Hannigan, R. Refining oxygenation conditions in the Late Permian of Spiti Valley, India. Geological Society of America Annual Meeting, Denver, Co, USA September 25-28 (oral)
2015
Williams, J.C., Darrah, T. H., Poreda, S., Whyte. C., Stebbins, A.G., Hannigan, R. Are Union Springs and Oatka Creek members of the Marcellus Formation formed under different depositional conditions? Geological Society of America Annual Meeting, Baltimore, MD, USA, November 1-4 (oral)
Stebbins, A., Algeo, T., Hart, R., Krystyn, L., Williams, J., Brookfield, M., Hannigan, R. The early Triassic sulfur isotope curve of seawater sulfate from marine carbonates in the Neo-Tethys. Goldschmidt Conference 2015 Meeting, Prague, Czech Republic, August 16-21 (oral)
Harrington, J., Muehlenbachs, K., Whyte, C., Williams, J.C., Darrah, T. Integrating noble gas and compound-specific stable isotopes to characterize the generation and migration of oil-associated gases and H2S in the Eagle Ford shale of Texas, USA. Goldschmidt Conference 2015 Meeting, Prague, Czech Republic, August 16-21 (oral)
Hart, R., Stebbins, A., Brookfield, M., Williams, J., Hannigan, R. Characterizing the end-Permian mass extinction in the neo-Tethys through organic geochemistry. Goldschmidt Conference 2015 Meeting, Prague, Czech Republic, August 16-21 (oral)
2014
Williams, J.C., Darrah. T. H., Koons, R., Hannigan, R. The paleoenvironment of the Marcellus Formation: Implication for understanding the origin of unconventional oil and gas reservoirs. Geological Society of America Annual Meeting, Vancouver, British Columbia, Canada, October 19-22 (oral)
Brourman, H., Darrah, T.H., Williams. J.C., Olesik, J., Poreda, R. Noble gas geochemistry of the Marcellus Shale Formation: A prospecting tool for hydrocarbon gas migration. Geological Society of America Annual Meeting, Vancouver, British Columbia, Canada, October 19-22 (oral)
Santistevan, A., Algeo, T.J., Hannigan, R., Williams, J.C. The role of the Siberian Traps in the Permian-Triassic Extinction: Analysis through chemical fingerprinting of marine sediments using rare earth elements (REEs). Geological Society of America Annual Meeting, Vancouver, British Columbia, Canada, October 19-22 (oral)
Williams, J.C., Darrah, T.H., Johannesson, K, Stebbins, A.G, Hannigan, R. Rare earth elements as a proxy for redox conditions in black shales? Goldschmidt Conference 2014 Meeting, Sacramento, CA June 8- 13 (oral)
Darrah, T.H., Williams, J.C. Understanding the trace element composition of modern human bone. Goldschmidt Conference 2014 Meeting, Sacramento, CA June 8-13 (oral)
2013
Williams, J.C., Stebbins, A., Sudar, M., Jovanovic, D., Brookfield, M., Algeo, T., Berman, M., Hannigan, R. The geochemistry of a newly discovered permo-triassic section in Serbia: A tale of catastrophic events. American Geophysical Union (AGU) Fall 2013 Meeting, San Francisco, CA, December 9-13 (poster)
Brookfield, M., Algeo, T., Hannigan, R., Williams, J.C., Bhat, G.M. The great end Permian tsunamis: recognition, extent and generation. American Geophysical Union (AGU) Fall 2013 Meeting, San Francisco, CA, December 9-13 (poster)
Stebbins, A., Holmes, S., Fernandes, M., Williams, J.C., Hannigan, R. Utilizing pyritic δ34S to characterize the depositional conditions of the Neo-Tethys in the late Permian. American Geophysical Union (AGU) Fall 2013 Meeting, San Francisco, CA, December 9-13 (oral)
Williams, J.C., Sudar, M., Jovanovic, D., Brookfield, M.E. Geochemistry and sedimentology of a new Permo-Triassic boundary section in Serbia. International Geoscience Program (IGCP) 572 World Summit on P-Tr Mass Extinction and Climate Change, Wuhan, China June 14. (oral)
Stebbins, A., Fernandes, G., Williams, J.C., Hannigan, R. Utilizing C-S-Fe systematics to determine bottom water oxygenation conditions of the Neo-Tethys. International Geoscience Program (IGCP) 572 World Summit on P-Tr Mass Extinction and Climate Change, Wuhan, China, June 14. (oral)
Williams, J.C., Hannigan, R., Basu, A. R., Ghosh, N., Brookfield, M.E., Stebbins, A. Episodic changes in the geochemical record of the Late Permian: Spiti Valley, Himachal Pradesh, Himalaya. International Geoscience Program (IGCP) 572 World Summit on P-Tr Mass Extinction and Climate Change, Wuhan, China, June 13. (oral)
Santistevan, F., Algeo, T. J., Hannigan, R., Williams, J.C. The role of the Siberian Traps in the Permian-Triassic mass extinction: Analysis through chemical fingerprinting of marine sediments using rare earth elements (REEs). Geological Society of America North-Central Section 47th Annual Meeting, Kalamazoo, MI, May 2. (oral)
2012
Etienne, E.D., Hannigan, R, Williams, J.C. Accounting for variations of delta-13-c isotopic record at the Lingti Permian-Triassic Section. Geological Society of America Annual Meeting, Charlotte, NC, Nov 6. (poster)
Williams, J.C., Hannigan, R., Basu, A. R., Ghosh, N., Brookfield, M., Etienne, E.D. Using stable light isotopes to identify environmental changes in the Neo-Tethys ocean during the Permian-Triassic Extinction. Geological Society of America Annual Meeting, Charlotte, NC, Nov 4. (oral)
Williams. J.C., Hannigan, R., Basu, A.R., Ghosh, N., Brookfield, M. Accounting for Post-Depositional Effects on a Neo-Tethyan Permian- Triassic Section in the Himalayan Mountains. Goldschmidt Conference, Montreal, QC, Canada, June 28. (oral)
2011
Williams, J.C., Basu, A.R., Bhagarva, O.N., Ahluwalia, A.D., Hannigan, R. A paleo-environmental analysis of the Attargoo Permo-Triassic Section: a neo-Tethyan section. XVII International Congress on the Carboniferous and Permian, Perth, Australia, July 6 (oral)
Brookfield, M. E., Hannigan R., Algeo, T., Williams. J.C. Sedimentology and geochemistry of the Permo-Triassic boundary section at Guryul Ravine, Kashmir, India; a comparison of the with the Texas Cretaceous- Tertiary boundary section. XVII International Congress on the Carboniferous and Permian, Perth, Australia, July 5 (oral)
2010
Williams, J.C., Ripley-Daniels, H.S. Science Enrichment: Bridging the gap between elementary school science and graduate research scientist. NSF Graduate Stem Fellows in K-12 Education Annual Conference, Washington D.C., March 27 (poster)
2009
Williams, J.C., Layton, A., Kammler, B., Polk, A., Shelton, J., Gray, K. Assessing the impacts of humans on the Tyronza River: A human agriculturally dominated watershed. American Society of Limnology and Oceanography (ASLO) Aquatic Science Meeting, Nice, France January 27, 2009 (oral)
2008
Williams, J.C., Czajkowski, K., Hayase, R. Impacts of land cover and usage on water quality in western Lake Erie watersheds. American Society of Limnology and Oceanography (ASLO) Ocean Science Meeting, Orlando, FL March 5 (poster)