Master of Science and Doctor of
Philosophy in geology with an emphasis on paleontology/paleobiology
and stratigraphy, The Ohio State University, Columbus, Ohio
(Walter C. Sweet, advisor)
Bachelor of Science in geology (cum laude) with
67 hours in geology and 20 hours in biological sciences, The
Ohio State University, Columbus, Ohio (Walter C. Sweet,
I am actively involved in seven projects: (1) a revised conodont-, graptolite-, chitinozoa-, and event-based Gorstian-Lochkovian (Silurian-earliest Devonian) chronostratigraphy (with James Barrick); (2) δ 13C chemostratigraphy of Ordovician/Silurian boundary strata of the North American Midcontinent (with Stig Bergström); (3) conodont biostratigraphy, oceanic episodes, and δ 13C chemostratigraphy of Silurian/Devonian boundary strata in New York; (4) Ireviken Event and Ireviken δ 13C excursion (with Brad Cramer and many others); (5) oceanic episodes, 13C chemostratigraphy, and updated Homerian, Gorstian, and Ludfordian (Silurian) conodont biostratigraphy of the North American Midcontinent Basins and Arches region of southern Laurentia (Master’s advisee Rob Swift is working on a research project that is a part of this research); and (6) Silurian high-resolution stratigraphy on the Cincinnati Arch (with Brad Cramer, Pat McLaughlin, and Carlton Brett); and (7) Lower Silurian of Ohio and Kentucky. I received Lima campus research grants to help out with the projects 2-7. I submitted a joint proposal concerning the fifth-listed project with a colleague at Texas Tech University (James Barrick) to the National Science Foundation for its January 2005 deadline, which was funded for three years (for $286,000) beginning August 15, 2005 (and extended for a fourth and fifth year, that ended on July 31, 2010). My plans for the future include completing all of the studies briefly summarized above (particularly the NSF-supported research), as well as continuing studies of Silurian conodonts and stratigraphy.
Cramer, B. D., Brett, C. E., Melchin, M. J., Männik, P., Kleffner, M. A., Mclaughlin, P. I.,
Loydell, D. K., Munnecke, A., Jeppsson, L., Corradini, C., Brunton, F. R., and Saltzman, M.
R. 2011. Revised correlation of Silurian Provincial Series of North America with global
and regional chronostratigraphic units and δ13Ccarb chronostratigraphy. Lethaia, 44:185-202.
Kleffner, M.A. & Barrick, J.E., 2010:10:29. Telychian-early Sheinwoodian (early Silurian) conodont-, graptolite-, chitinozoan- and event-based chronostratigraphy developed using the graphic correlation method. Memoirs of the Association of Australasian Palaeontologists 39, 191-210. ISSN 0810-8889.
Cramer, B.D., Kleffner, M.A., Brett, C.E., McLaughlin, P.I., Jeppsson, L., Munnecke, A., & Samtleben, C. 2010. Paleobiogeography, high-resolution stratigraphy, and the future of Paleozoic biostratigraphy: Fine-scale diachroneity of the Wenlock (Silurian) conodont Kockelella walliseri. Palaeogeography, Palaeoclimatology, Palaeoecology 294: 232-241.
Barrick, J.E., Kleffner, M.A., Gibson, M.A., Peavey, F.N. & Karlsson, H.R., 2010. The mid-Ludfordian Lau Event (Ludlow, Silurian) in southern Laurentia - Preliminary results. Bollettino della Società Paleontologica Italiana 49, 13-33.
Barrick, J.E., Klapper, G., Kleffner, M.A. & Karlsson, H.R., 2010. Conodont biostratigraphy and stable isotope chemostratigraphy of the lower Henryhouse Formation (Gorstian-early Ludfordian, Ludlow, Silurian), southern Oklahoma, USA. Memoirs of the Association of Australasian Palaeontologists 39, 51-70. ISSN 0810-8889.
Cramer, B.D., Loydell, D.K., Samtleben, C., Munnecke, A., Kaljo, D., Männik, P., Martma, T., Jeppsson, L., Kleffner, M.A., Barrick, J.E., Johnson, C.A., Emsbo, P., Bickert, T., Joachimski, M.M., & Saltzman, M.R. 2010. Testing the limits of Paleozoic chronostratigraphic correlation via high-resolution (<500 k.y.) integrated conodont, graptolite, and carbon isotope (δ13Ccarb) biochemostratigraphy across the Llandovery-Wenlock (Silurian) boundary: Is a unified Phanerozoic timescale achievable? Geological Society of America Bulletin, 122: 1700 - 1716.
Jacobi, D. J., Barrick, J. E., Kleffner, M. A., and Karlsson, H. K. 2009. Stable isotope
chemostratigraphy and conodont biostratigraphy across the Silurian-Devonian Boundary in
southwesten Laurentia. Palaontographica Americana 63, 9-31.
Kleffner, M. A, Barrick, J. E., Ebert, J. R., Matteson, D. K., and Karlsson, H. R. 2009. Conodont
biostratigraphy, δ13C chemostratigraphy, and recognition of Silurian/Devonian boundary in the
Cherry Valley, New York region of the Appalachian Basin. Paleontographica Americana 62, 57-
Barrick, J. E., Kleffner, M. A., and Karlsson, H. R. 2009. Conodont faunas and stable isotopes across
the Mulde Event (late Wenlock; Silurian) in southwestern Laurentia (south-central Oklahoma and
subsurface West Texas). Paleontographica Americana 62, 41-56.
McLaughlin, P. I., Cramer, B. D., Brett, C. E., Kleffner, M. A. 2008. Silurian Stratigraphy
across the Cincinnati Arch: Recalibrating the Layer Cake. The Geological Society of America
Field Guide 12, 119-180. doi: 10.1130/2008.fld012(08).
Loydell, D. K., Kleffner, M. A., Mullins, G. L., Butcher, A., Matteson, D. K., and Ebert, J. E.
2007. The lower Williamson Shale (Silurian) of New York: a biostratigraphical enigma. Geological
Cramer, B.D., Saltzman, M.R., and Kleffner, M.A., 2006. Spatial and temporal variability in organic
carbon burial during global positive carbon isotope excursions: New insight from high resolution
δ13Ccarb stratigraphy from the type area of the Niagaran Provincial Series. Stratigraphy, 2 (4): 327-
Cramer, B.D., Kleffner, M.A., and Saltzman, M.R., 2006. The late Wenlock Mulde positive carbon
isotope (δ 13Ccarb ) excursion in North America. GFF, 128(2): 85-90.
Collaborative Research: Late Wenlock-Ludlow (Silurian) Oceanic
Episodes and Events, Southern Laurentia, National Science Foundation
grant EAR-0517929 for four years (8/15/05-7/31/10) for $286,002
Conodont biostratigraphy and correlation of Lower Silurian strata
associated with the Waukesha biota, Subcontractor on National
Science Foundation grant to Illinois Geological Survey (Donald
Mikulic, Principal Investigator), 8/1/92-7/30/93, with a budget of
$15,013 for my portion of the project.
Taxonomy and biostratigraphic
significance of Wenlockian and Ludlovian (Silurian) conodonts in the
Midcontinent outcrop area, North America, (The listed Principal
Investigator was my advisor, Walter C. Sweet, whose name was of
major importance in the project getting funded, however the project
was my concept, I wrote the proposal, and I was responsible for all
the work done on the research project, which was my dissertation)
National Science Foundation, Award No. EAR-8307021, 7/1/84-6/30/87,
Outstanding Scholar Award, The Ohio State University at Lima, 2010, 1991