Education
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1979-1988 |
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) |
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1975-1979 |
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,
advisor) |
Current/Future Research
My research is focused on Silurian conodonts and
Silurian stratigraphy, primarily in the Midcontinent outcrop area,
North America. I am presently actively involved in six projects:
Lower Silurian of Ohio and Kentucky; a revised conodont-,
graptolite-, and chitinozoa-based Silurian chronostratigraphy; 13C
chemostratigraphy of Ordovician/Silurian boundary strata of the
North American Midcontinent (with Stig Bergström); conodont
biostratigraphy, oceanic episodes, and 13C chemostratigraphy of
Silurian/Devonian boundary strata of Cherry Valley region, New
York; oceanic episodes, 13C chemostratigraphy, and updated
Homerian, Gorstian, and Ludfordian (Silurian) conodont
biostratigraphy of North America; Ireviken Event and post-Ireviken
13C excursion in Niagara region, New York (with Brad Cramer); and
an integrated conodont, graptolite, and chitinozoa biostratigraphy
for the Williamson Shale, Rochester, New York (with David Loydell
and Gary Mullins). I received Lima campus research grants to help
out with the first three projects listed. I am working on a joint
proposal concerning the fourth-listed project with a colleague at
Texas Tech University (James Barrick) to submit to the National
Science Foundation for its January 2005 deadline. My plans for
the future include completing all of the studies briefly
summarized above, as well as continuing studies of Silurian
conodonts and stratigraphy.
Selected Publications
Kleffner, M. A.,
Barrick, J. E., and Tychsen, A. 2004. Conodont-, graptolite-, and
chitinozoa-based Silurian composite developed using graphic
correlation aids new calibration of current Silurian
chronostratigraphy [abs.] Geological Association of Canada,
Mineralogical Association of Canada 2004 Joint Annual Meeting
Abstracts Volume (ISBN 0-919216-97-8), p. 96.
Kleffner, M. A.,
1995, *A conodont- and graptolite-based Silurian chronostratigraphy.
In Mann, K. and Lane, H. R., (eds.) Graphic Correlation.
SEPM Society for Sedimentary Geology Special Publication No. 53, p.
159-176. Tulsa, OK.
--------, 1994, *Conodont
biostratigraphy and depositional history of strata comprising the
Niagaran sequence (Silurian) in the northern part of the Cincinnati
Arch region, west-central Ohio, and evolution of Kockelella
walliseri (Helfrich), Journal of Paleontology, 68(1):141-153.
--------, 1991, *Conodont biostratigraphy of the
upper part of the Clinton Group and the Lockport Group
(Silurian) in the Niagara Gorge region, New York and Ontario,
Journal of Paleontology, 65(3):500-511.
--------, 1990, *Wenlockian
(Silurian) conodont biostratigraphy, depositional environments, and
depositional history along the eastern flank of the Cincinnati Arch
in southern Ohio, Journal of Paleontology 64(2):319-328.
--------, 1989, *A
conodont-based Silurian chronostratigraphy, Geological Society of
America Bulletin, 101:904-912.
--------, 1987, *Conodonts
of the Estill Shale and Bisher Formation (Silurian, southern Ohio):
biostratigraphy and distribution, The Ohio Journal of Science 87(3):
78-89.
--------, 1985, *Conodont
biostratigraphy of the Stray "Clinton" and "Packer Shell"(Silurian,
Ohio subsurface) and its bearing on correlation, in Gray, J.,
Maslowski, A., McCullough, W., and Shafer, W. E., (eds.) The New
Clinton Collection-1985, Columbus, Ohio, Ohio Geological Society, p.
219-229.
Research Awards
Outstanding Scholar Award for 1991, The Ohio State
University at Lima
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