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Mary Beth Gray

Associate Professor of Geology


Education

  • Ph.D. Geological Sciences, University of Rochester, Rochester, New York
  • M.A. Geology, Bryn Mawr College, Bryn Mawr, Pennsylvania
  • B.A. Geology, Bucknell University, Lewisburg, Pennsylvania
  • B.S. Civil Engineering, Bucknell University, Lewisburg, Pennsylvania

Related Employment

  • Amerada Hess Post-Doctoral Fellow, 1991-1992, Imperial College of Science, Technology and Medicine, London, England.
  • Consultant, 1997 - present, Center for Nuclear Waste Regulatory Analyses, Southwest Research Institute, San Antonio, TX

Photomicrograph of fault rock from a sample gathered
in the Exploratory Studies Facility, Yucca Mountain, NV
Research Interests



  • Extensional structure/tectonics: My interests and skills in extensional tectonic analysis principally developed during my post-doctoral work on North Sea tectonics. I continue this line of query through work in the Basin and Range with the support of the Center for Nuclear Waste Regulatory Analyses at the Southwest Research Institute. I have been conducting microstructural analyses on fault zones in the Micocene tuffs of Yucca Mountain, Nevada, in an effort to charaterize, among other things, the deformation history of potentially seismically active fault zones in Yucca Mountain.
  • Tectonics and synorogenic sedimentation: My masters research on structural analysis of the synorogenic Cretaceous Gannett Group in Wyoming-Idaho, collaborative work on the Paleocene-Eocene Beartooth Conglomerate on the eastern flank of the Beartooth uplift, Wyoming-Montana, and study of the thermochronology of central Appalachian foreland basin deposits attest to my significant interests synorogenic deposits as interpretive tools in structural analysis. I have also begun new research on Oligocene synorgenic deposits in Southern Nevada in collaboration with John Stamatakos, CNWRA, and Ken Ridgway, Purdue University.
  • Temporal and spatial aspects of progressive deformation in fold and thrust belts: I have worked in the Appalachian and Sevier fold and thrust belts. My primary interests lie in spatial and temporal aspects of progressive deformation and rate-controlling deformation mechanisms in mountain belts.
  • Central Appalachian structure/tectonics: Collaboration with geoscientists in other sub-disciplines has allowed me to explore innovative, integrated approaches to solving long-standing structural/tectonic questions in the central Appalachians, with implications for other contractional orogens.
  • Fluid migration and evolution during orogenesis: Fluids can simultaneously control and record parameters of deformation. I have analyzed fluid inclusions in veins of known structural timing in an effort to learn about space-time changes in deformation conditions. I have supervised externally-funded undergraduate research on this topic.


Courses Taught

  • Structural Geology (NFW)
  • Tectonics (NFW)
  • Engineering Geology (NFW)
  • Geophysics (may be taken for graduate credit) (NFW)
  • Environmental Geology (NFW)
  • The Tender Land: a Foundation Seminar on land use issues. (Environmental College, W1, NFW)
  • The Dynamic Earth (Introductory Physical Geology) (NFW)
  • Exploring Earthquakes: a Foundation Seminar (W1, NFW) (in prep.)


Publications

  • Gray, M.B. and Mitra, G., 1999, Ramifications of four dimensional progressive deformation in contractional mountain belts: Journal of Structural Geology, v. 21, p. 1151-1160. ABSTRACT
  • Gray, M.B. and Stamatakos, J., 1997, New model for evolution of fold and thrust belt curvature based on integrated structural and paleomagnetic results from the Pennsylvania salient: Geology, v. 25, p. 1067-1070. ABSTRACT
  • Gray, M.B. and Zeitler, P.K., 1997, Comparision of Clastic Wedge Provenance in the Appalachian Foreland using U/Pb Ages of Detrital Zircons, Tectonics: v. 16, p. 151-160. ABSTRACT
  • Gray, M.B. and Mitra, G., 1993, Migration of deformation fronts during progressive deformation: evidence from detailed studies in the Pennsylvania Southern Anthracite region, U.S.A.: Journal of Structural Geology, v. 15, p. 435-450. ABSTRACT
  • DeCelles, P.G., Gray, M.B.,Ridgway, K.D., Cole, R.B., Srivastava, P., Pequera, N., and Pivnik, D.A., 1991, History and kinematics of foreland uplift from synorogenic conglomerate, Beartooth Range, Wyoming and Montana: Geological Society of America Bulletin, v. 103, p. 1458-1476. ABSTRACT
  • DeCelles, P.G., Gray, M.B., Ridgway, K.D., Cole, R.B., Pivnik, D.A., Pequera, N., and Srivastava, P., 1991, Controls on alluvial-fan architecture, Beartooth Conglomerate (Palaeocene), Wyoming and Montana: Sedimentology, v. 38, p. 567-590. ABSTRACT
  • Gray, M.B., and Nickelsen, R.P., 1989, Pedogenic slickensides, indicators of strain and deformation processes in redbed sequences of the Appalachian foreland: Geology, v. 17, p. 72-75. ABSTRACT


Current Funding

  • National Science Foundation Grant, Fred Day-Lewis and Mary Beth Gray, PI's, (CCLI - Adaptation and Implementation Program): Integrating Applied Geophysics into a Student Centered Undergraduate Curriculum. Three year award, starting February 1, 2002, Total project budget: $130,888.


Scientific Reports

  • Farrell, D.A., Armstrong, A., Winterle, J., Turner, D., Ferrill, D.A., Stamatakos, J., Coleman, N., Gray, M. B., and Sandberg, S. K., 1999, Structural controls on groundwater flow in the Yucca Mountain region. Center for Nuclear Waste Regulatory Analyses, Southwest Research Institute, San Antonio, Texas.
  • Stamatakos, J.A., R. Chen, W.M. Dunne, D.A. Ferrill, M.B. Gray, P.C. LaFemina, H.L. McKague, A.P. Morris, D.W. Sims,and D.J. Waiting, 2000, Input to issue resolution status report key technical issue: Structural deformation and seismicity. Center for Nuclear Waste Regulatory Analyses, Southwest Research Institute, San Antonio, Texas.


Recent Abstracts (within the last five years)

  • Gray, Mary Beth, Stamatakos, J. A., and Ferrill, D. A., 2001, Polygenetic secondary calcite mienralization in Yucca Mountain, NV. Geological Society of America Abstracts with Programs, v. 32, p. A-260.
  • Stamatakos, J.A., B.E. Hill, D.A. Ferrill, P. LaFemina, D.W. Sims, C.B. Connor, and M.B. Gray, in press, Tectonic evolution of the Crater Flat Basin, Nevada. Geological Society of America Abstracts with Programs, v. 32 , p. A-507.
  • Gray, M.B., Stamatakos, J.A., Ferrill, D.A., and Evans, M.A., 1999, Fault behavior and fault zone architecture in Miocene volcanic tuffs at Yucca Mountain, NV. To be presented at Special Session S03: "Internal Fault Structure", 1999 American Geophysical Union Meeting in San Francisco, CA., EOS, Transactions of the American Geophysical Union , v. 80.
  • Bradfield, William, B., and Gray, M.B., 1999, Temperatures of Alleghanian deformation in the Silurian Bloomsburg Formation, Lehigh Gap, Pennsylvania. Geological Society of America Abstracts with Programs, v. 31.
  • Gray, M.B., Stamatakos, J. A., and Ferrill, D. A., 1998, Microstructural and microtextural analyses of faulting at Yucca Mountain, Nevada, ,presented at Symposium T11C: "Investigations of Rock Fracture: Lessons for Understanding Fluid Flow in Fractured Rock", 1998 American Geophysical Union Meeting in San Francisco, CA, EOS, Transactions of the American Geophysical Union, v. 79, no. 45, p. F823.
  • Gray, M.B., 1998, Nature of transition in structural styles and progressive deformation at the Allegheny front, central Pennsylvania, invited abstract for symposium entitled, "Structure and Tectonics of the Appalachians: Recent Milestones" Geological Society of America Abstracts with Programs, v. 30, p. 15 .
  • Davatzes, N. C., and Gray, M.B., 1998, Strain partitioning and factorization in the Silurian Keefer sandstone, central Pennsylvania, Geological Society of America Abstracts with Programs, v. 30, p. 9.
  • Spiker, E. C., and Gray, M.B., 1997, A study of progressive deformation at the Allegheny Front, Lycoming County, PA., Geological Society of America Abstracts with Programs: v. 29, no. 1, p. 82.

Photomicrograph of the Silurian Poxono Island Formation
illustrating subhorizontal microlaminations, one penetrative
cleavage and one, overprinting crenulation cleavage.


Lindsay Guiliano, '03, current adivsee,
collecting structural data from the Silurian Bloomsburg Formation
for a GEOL 201 (structural geology) field project
Student Research Advisees:

  • Robert Garfield, '03, "Downscaling regional structural observations to interpret borehole hydrogeophysical data. (co-advised by Fred-Day-Lewis)
  • Lindsay Guiliano, '03, "Analysis of deformation bands in Oligocene (?) and early Miocene deposits of the Funeral Mountains, south-central Nevada"
  • Adrienne Johnson, '00, "A structural study and assesment of economic reserves at the National Limestone Quarry, Middleburg, PA"
  • William Bradfield, '99, "Temperatures of Alleghanian deformation in the Silurian Bloomsburg Formation, Lehigh Gap, Pennsylvania"
  • Nicholas Davatzes, '98, "Strain partitioning and factorization in the Silurian Keefer Sandstone, central Pennsylvania. Honors Thesis.
  • Robert Jacob '97, "Environmental geophysical study of the Chillisquaque Creek floodplain in central Pennsylvania".
  • Elizabeth Spiker, '97, "A study of progressive deformation at the Allegheny front, Lycoming County, Pennsylvania".
  • Miika Roggio, '97, "Geologic cross section, Lewisburg to Montoursville, Pennsylvania".
  • Sara Gordon, '96, Evolution of the shoreline of Kent County, Maryland".
  • Brad Carlson, '95, "Kinematic history of a mesoscopic fault-propagation fold, Meckley's quarry, Mandata, Pennsylvania".
  • Jeanne Klawon, '95, Analysis of the Light Street fault in relation to the Berwick anticlinorium". Honors Thesis.
  • James Miller, 95, "Structural controls on karstification in the Nippenose Valley, Pennsylvania".


Internet: mbgray@bucknell.edu

Phone: (570) 577-1146

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