Dr. D. Jeffrey Over

Dr. Jeffrey Over

Earth History: Paleontology, Stratigraphy
Email: over@geneseo.edu
Office: ISC 230
Ph.D. Texas Tech University
M.Sc. University of Alberta
B.S. Allegheny College


Post-doctoral, 1990-91, Research Associate, Department of Geology, Texas A&M University , College Station , TX (Advisor – Ethan Grossman)
Ph.D. (Geology), 1990, Texas Tech University , Lubbock , Texas (Advisor – James Barrick)
M.Sc. (Geology), 1985, University of Alberta , Edmonton , Alberta (Advisor – Brian Chatterton)
B.S. (Geology, Biology Minor), 1982, Allegheny College , Meadville , Pennsylvania

Professional Experience

2000- Professor, Department of Geological Sciences, SUNY College at Geneseo, Geneseo , NY
1996-2000 Associate Professor, Department of Geological Sciences, SUNY College at Geneseo, Geneseo , NY
1991-1996 Assistant Professor, Department of Geological Sciences, SUNY College at Geneseo, Geneseo , NY
1990-1991 Visiting Assistant Professor/Research Associate, Department of Geology, Texas A&M University , College Station , TX
1989-1990 Instructor, Department of Geosciences, Texas Tech University , Lubbock , TX

Directed Research (Undergraduate)

  • Wilcott, M., 2004, Givetian and Frasnian ash beds in western New York .
  • Heath, K., 2004, Geology of Mackay Nature Reserve, Caledonia , New York .
  • Neal, K., 2004, Conodont-rich horizon in the Windom Shale.
  • Julian, M., 2004, Benthic foraminifera from the Georgia Bight.
  • Demyanick, B., 2003, Geologic map of Sonyea Quadrangle.
  • Norton, A., 2003, Geology Honors Thesis, Magneticsusceptibility of Upper Devonian strata, Alberta , Canada .
  • Heath, K., Kartis, V., Lester, M., and Wilcott, M., 2003, “Madjack” – analysis of Quaternary gravel - New Mexico .
  • Langerlan, K., 2003, Geochemistry of unionid shells: a record of environmental contamination (w/C. Romanek, Savanah River Ecology Laboratory).
  • Nowak, T., 2002, Correlation and Geochemistry of Eocene Ash.
  • Rosscoe, S., 2002, Eifelian-Givetian Boundary in western New York .
  • Castle, J., 2002, Geology Honors Thesis, Taxonomic diversity of the trilobite Phacops.
  • Jones, M., 2001, Geologic map of Mt. Morris Quadrangle.
  • Valvo, L., 2001, Graphical Correlation of Chattanooga Shale.
  • Fuentes, S., 2001, Geology Honors Thesis, Biostratigraphy of the Olentangy Shale.
  • Sullivan, N., 2010, Govialtai Formation, Tsakhir, southern Mongolia. (honors thesis)
  • Malenick, B., 2011, Upper Devonian faunas in western New York.
  • Kotash, A., 2011, Oligocene ash from Peach Springs Canyon, Arizona.
  • Gregory, P., 2012, Geologic map of Indian Fort, Geneseo, NY.
  • Evans, S., 2012, Devonian-Carboniferous boundary in southern Indiana.
  • Popolla, A., 2012, Ordovician-Silurian conodonts in Mongolia.
  • Hogancamp, N., 2012, Polygnathus linguiformis morphometrics.
  • Evans, S., 2013, Clam geochemistry. (honors thesis)
  • Waid, C., 2013, Maplewood conodonts.
  • Lanik, A., 2013, Upper Devonian (Frasnian) ash beds. (honors thesis)
  • Kohn, J., 2013, Frasnian tentaculitids. (honors thesis)
  • Danielsen, E., 2013, Ordovician-Silurian conodonts – Yamaan Us, Mongolia.
  • Hynes, A., 2014, Frasnian-Famennian from Iowa. (honors thesis)
  • Leskovec, J., 2014, Angola Shale.
  • Haussner, E., 2014, Rimrock Draw sediments. (honors thesis)
  • Danielsen, E., 2014, Silurian conodonts from Mongolia – Journal of Asian Earth Sciences.
  • Frieman, R., 2014, Black shale fabric.
  • Wistort, Z., 2014, Dyer Formation and D-C boundary in Colorado. (honors thesis)
  • Tuskes, K., 2014, Upper Devonian astrochronology. (honors thesis)
  • Danielsen, E., 2014, Marcellus Shale in type area of New York State. (honors thesis)
  • Sullivan, D., 2015, Schurtleff Horizon in NYS.
  • Wallace, J., 2016, Devonian core from Kentucky. (honors thesis)
  • Olin, A., 2016, Environmental Science Laboratory Introduction Videos.
  • Horner, G., 2016, Dyer Formation - Broken Rib - Coffee Pot transition at Monument Lake, CO.
  • Jonasse, N., 2016, Allentown Formation
  • Bates, M., 2016, Dyer MS and cycles (honors thesis)
  • Mindich, A., 2017, Carbon sequestration in Medina Sandstone.
  • McGinn, E., 2017, Canaseraga conodonts.
  • Engelbert, A.J., 2017, Conodont taphonomy (honors thesis)
  • Balinski, I., 2017, Pliocene-Pleistocene boundary fauna in North Carolina.
  • Mindich, A., 2017, Geneseo carbon studies.
  • Mindich, A., 2017, Geneseo carbon studies and sequestration (honors thesis).
  • Antalek, A., 2017, Sub-precession cycles in the Upper Devonian.
  • Antalek, A., 2017, Photo analysis of sub-precession cycles in the Upper Devonian (honors thesis).
  • DeMott, A., 2018, Sodus tentaculitids.
  • Hauf, E., 2018, Schurtleff photometry.
  • DeMott, A., 2019, Tentaculites minutus.
  • Walsh, P., 2019, Mill Creek geology map.
  • Hackett, S., 2019, Kettle Point MS.
  • Ruggerio, J., 2019 Marcellus MS.
  • Farragguia, V., 2019, Marcellus MS.
  • Bennett, Y., 2019, Kettle Point conodonts.


  • Chancellor’s Award for Excellence in Scholarship and Creative Activities, State University of New York, 10/03.
  • Lockhart Professor of Geological Sciences, SUNY-Geneseo, 2000-2003.
  • National Science Foundation-Research at Undergraduate Institutions: Upper Devonian black shales, $3,000 supplement to EAR-9614314, 8/99.
  • Chancellor’s Award for Excellence in Teaching, State University of New York, 8/98.
  • National Science Foundation-Research at Undergraduate Institutions: Upper Devonian black shales in eastern North America, conodont biostratigraphy, Frasnian-Famennian mass extinction horizon, and absolute dates from associated ash layers, $75,000, PI, 2/97-12/01.
  • National Science Foundation- Collaborative Research at Undergraduate Institutions: Testing hypotheses for Late Devonian biotic and climatic events via high-precision CA-TIMS U-Pb zircon dating and quantitative correlation tools. $98,223, w/M. Schmitz and V. Davydov, Boise State University, $188,968, 9/11-6/15.
  • Keck Geology Consortium NSF-REU: Paleobiogeographic Reconstruction of the Gobi-Altai Terrane, Mongolia, project faculty member, 2/09-4/10.
  • Petroleum Research Fund-American Chemical Society: Eifelian-Givetian boundary (Middle Devonian) in eastern North America, $50,000, PI, 9/05-8/10.


Refereed Journals/Volumes (student authors):

  • Over, D.J., Hopkins , T.L., Brill, A., and Spaziani, A.L., 2003, Age of the Middlesex Shale (Upper Devonian, Frasnian) in New York State : Cour. Forsch.-Inst. Senckenberg, v. 242, p. 217-223.
  • Brett, C.E., Turner, A.H., McLaughlin, P.I., Over, D.J., Storrs, G.W., Baird, G.C., 2003, Middle-Upper Devonian (Givetian-Famennian) bone/conodont beds from central Kentucky: reworking and event condensation in the distal Acadian Foreland Basin : Cour. Forsch.-Inst. Senckenberg, v. 242, p. 125-139.
  • Over, D.J., and Rotondo, K.A., 2003, Biostratigraphic control on the Belpre Ash, Little War Gap and its bearing on the Devonian time scale of Tucker et al., (1998): IUGS Subcommission on Devonian Stratigraphy, Newsletter No. 18, p. 91-92 [imprint 2001].
  • Over, D.J., 2002, The Frasnian-Famennian Boundary in the Appalachian Basin, Michigan Basin, Illinois Basin, and southern continental margin, central and eastern United States: Palaeogeography, Palaeoclimatology, Palaeoecology, 181(1-3), p. 153-170.
  • Crick, R.E., Ellwood, B.B., Feist, R., El Hassani, A., Schindler, E., Dreesen, R., and Over, D.J., 2002, Magnetostratigraphy susceptability of the Frasnian/Famennian Boundary (Upper Devonian): southern France , Morocco , Belgium , Germany , and Oklahoma (USA): Palaeogeography, Palaeoclimatology, Palaeoecology, v. 181(1-3), p. 67-90.
  • Day, J.E., and Over, D.J., 2002, Early Famennian post-extinction brachiopod and conodont fauna in western New York State : Acta Paleontologica Polinca, v. 47(2), p. 189-202.
  • Fuentes, S., Over, D.J., and Brett, C.E., 2001, Conodont biostratigraphy of “Olentangy” Shale in northeastern Kentucky: In Algeo, T.J., and Brett, C.E. (eds.), Sequence, Cycle and Event Stratigraphy of Upper Ordovician and Silurian Strata of the Cincinnati Arch Region: Kentucky Geological Survey, Guidebook 1, Series XII, Lexington, Kentucky, p. 136-143.
  • Over D.J., and Rhodes, M.K., 2000, Conodonts from the Upper Olentangy Shale (Upper Devonian, central Ohio ) and stratigraphy across the Frasnian-Famennian boundary: Journal of Paleontology, v. 74, p. 101-112.
  • Over, D.J., Lazar, R., Baird, G.C., Schieber, J., and Ettensohn, F.R., 2009, Protosalvinia Dawson and associated conodonts of the Upper trachytera Zone, Famennian, Upper Devonian, in the eastern United States: Journal of Paleontology, v. 83, p. 70-79. 
  • Over, D.J., de la Rue, S., Isaacson, P.E., and Ellwood, B. 2009, Upper Devonian conodonts from black shales of the high latitude Tomachi Formation, Madre de Dios Basin, northern Bolivia: Palaeontographica Americana, v. 62, p. 89-99.
  • Over, D.J. (editor), 2009, Conodont Studies Commemorating the 150th Anniversary of the First Conodont Paper (Pander, 1856) and the 40th Anniversary of the Pander Society: Palaeontographica Americana, Paleontological Research Institute, Ithaca, NY, v. 62, 149 p. 
  • Gordon, G.W., Rockman, M., Turekian, K.K., and Over, J., 2009, Osmium isotopic evidence against an impact at the Frasnian-Famennian boundary: American Journal of Science, v. 309, p. 420-430.
  • Over, D.J., Rabideau, S., Travis, M., Grady, B., and Ver Straeten, C., 2011, Correlation of Marcellus Subgroup and recognition of the Eifelian-Givetian Boundary utilizing magnetic susceptibility in western New York.  In Nelson, N.R. (ed.), New York State Geological Association 83rd Annual Meeting, Field Trip Guide Book, p. 67-69.
  • Over, D.J., and Ruppel, S.C., 2012, Woodford conodonts and biostratigraphy (Upper Devonian – Carboniferous) in the subsurface of eastern New Mexico and Texas: Stratigraphy, v. 8, 271-280.
  • Over, D.J., 2013, Book review - Piecing together the history of the mysterious conodont: Knell, S.J., 2013, Fossil Enigma: the Search for the Conodont Animal: http://www.thisviewoflife.com/index.php/magazine/articles/conodonts
  • Hogancamp, N.J., and Over, D.J., 2013, The nature, range, and utility of stratigraphic distributions of morphotypes of Polygnathus linguiformis linguiformis Hinde, Middle Devonian, northern Appalachian Bsin, North America: Part 2 - Systematics.  In Albanesi, G.L. and Ortega, G. (eds.) Conodonts from the Andes, Asociacion Paleontologica Argentina Publicacion Especial No. 13, p. 55-62.
  • Hogancamp, N.J., and Over, D.J., 2013, The nature, range, and utility of stratigraphic distributions of morphotypes of Polygnathus linguiformis linguiformis Hinde, Middle Devonian, northern Appalachian Bsin, North America: Part 1.  In Albanesi, G.L. and Ortega, G. (eds.) Conodonts from the Andes, Asociacion Paleontologica Argentina Publicacion Especial No. 13, p. 49-54.
  • Bush, A.M., Csonka, J.D., DiRenzo, G.V., Over, D.J., and Beard, A., 2015, Revised correlation of the Frasnian-Famennian boundary and Kellwasser events (Late Devonian) in shallow marine paleoenvironments of New York State. Palaeogeography, Palaeoclimatology, Palaeoecology 433, p. 233–246.
  • Sullivan, N., Over, D.J., Chuluun, M., and Myrow, P., 2016. Subsidence and the drowning of a carbonate platform in south-central Mongolia (Gobi Altai Region) during the Late Eifelian to Early Givetian: A synthesis of biostratigraphy, magnetic susceptibility, and paleoecology. Journal of Asian Earth Sciences, v. 115, p. 204-213
  • Wade, C., and Over, D.J., 2016, Aeronian (Llandovery, Silurian) conodonts from the Densmore Creek Phosphate Bed and the Budd Road Phosphate Bed, Clinton Group, western New York State. Canadian Journal of Earth Sciences, v. 53, p. 645-650, 10.1139/cjes-2015-0140
  • Danielsen, E.M., and Over, D.J., 2016, Early Silurian conodonts from the Shine Jinst region of southwestern Mongolia. Journal of Paleonotlogy, v. 90. p. 78-91.
  • Whalen, M.T., de Vleeschouwer, D., Sliwinski, M., Day, J.E., Over, D.J., and Claeys, P., 2016, Pattern and timing of the Late Devonian biotic crisis in western Canada: insight from carbon isotopes and astronomical calibration of magnetic susceptibility data. SEPM Special Publication No. 107, 10.2110/sepmsp.107.02
  • Lanik, A., Over, D.J., Schmitz, M.D., and Kirchgasser, W.T., 2016, Testing the limits of chronostratigraphic resolution in the Appalachian Basin, Upper Devonian (Middle Frasnian), eastern North America: new U-Pb zircon dates for the Belpre Tephra Suite. Geological Society of America Bulletin, 10.1130/B31408.1
  • Corradini C., Spalletta C., Mossoni, A., Matyja, H., and Over, D.J., 2016. Conodonts across the Devonian/Carboniferous boundary: a review and implication for the redefinition of the boundary and proposal of an updated conodont zonation. Geological Magazine, 154(4): 888-902. DOI: 10.1017/S001675681600039X
  • Danielsen, E.M., Over, D.J., Baird, G.C., and Ver Straeten, C.A., 2017, The Marcellus subgroup in the type area, central New York State.  Stratigraphy, v. 13, p. 155-162. [imprint 2016]
  • Spalletta, C., Perri, M.C., Over, D.J., and Corradini, C., 2017, Famennian (Upper Devonian) conodont zonation: revised global standard.  Bulletin of Geosciences, v. 92, p. 31-57.
  • Bush, A.M., Beard, A., Baird, G., Over, D.J., Tuskes, K., Brisson, S.K., and Pier, J.Q., 2017. A2 and B2: Upper Devonian Kellwasser extinction events in New York and Pennsylvania: offshore to onshore transect across the Frasnian-Famennian Boundary of the eastern margin of the Appalachian Basin, p. 82-124.  In Muller, O.H. (ed.), Field Trip Guidebook, New York Geological Association 89th Annual Meeting, Alfred University, www.nysga-online.net
  • Over, D.J. and Henderson, C.M. (editors), 2018. Conodont Studies Dedicated to the Careers and Contributions of Anita Harris, Glen Merrill, Carl Rexroad, Walter Sweet, and Bruce Wardlaw.  Bulletins of American Paleontology, Ithaca, NY, Numbers 395-396, 198 p.
  • Over, D.J., Hauf, E., Wallace, J., Chiarello, J., Over, J.-S., Gilleaudeau, G, Yi, S., Algeo, T. 2019. Conodont biostratigraphy and magnetic susceptibility of Upper Devonian Chattanooga Shale, eastern United States: evidence for episodic deposition and disconformities. Palaeogeography, Palaeoclimatology, Palaeoecology, v. 524, p. 137-149.


(Papers presented at regional/national/international meetings)

  • Schieber, J., and Over, D.J., 2004, Age constraints on the formation of the Devonian Flynn Creek structure, Tennessee : Geological Society of America, Abstracts with Programs, v. 36(5), p.
  • Over, D.J., Miller, C.G., and Kearsley, A., 2004, Holotype of Palmatolepis punctata (Hinde, 1879) is from the Rhinestreet Shale: Geological Association of Canada – Mineralogical Association of Canada Joint Annual Meeting, Abstracts and Program, v. 29, p. 87.
  • Over, D.J., and Schindler, E., 2003, Depositional similarities in selected Late Devonian Kellwasser Horizons, Germany , Morocco , and eastern United States : Geological Society of America, Abstracts with Programs, v. 35(7), p. 384-385.
  • Over, D.J., 2002, Conodonts and age of depositional sequences in the Chattanooga Shale, Upper Devonian, southern Appalachian Basin: Geological Society of America, Abstracts with Programs, v. 34(7), p. 61-3.
  • Lehane, J.R., and Over, D.J., 2002, Canid and rodent scavenging on Pleistocene Cave Bear: Geological Society of America, Abstracts with Programs, v. 34(7), p. 66-21.
  • Over, D.J., 2002, Upper Devonian conodonts from the Chattanooga Shale, southern Appalachian Basin, eastern United States : Strata (Eighth International Conodont Symposium – ECOS VIII), Serie 1, vol. 12, p. 51.
  • Over, D.J., 2001, Kellwasser Bed (high Frasnian, Upper Devonian) equivalents in the Appalachian Basin: Geological Society of America, Abstracts with Programs, v. 33(7), p. A37.
  • Vacco, D.I., Sheldon, A.L., Over, D.J., and McCarthy, T.M., 2001, Geochemistry of a stratified pool in a flowing stream, Mount Morris , New York : Geological Society of America, Abstracts with Programs, v. 33(7), p. A231.