Contact Us
Department of Geology
Bryn Mawr College
101 North Merion Avenue
Bryn Mawr, PA 19010
Phone: (610) 526-7392
Fax: (610) 526-5086

Arlo B. Weil

Department of Geology ·  Bryn Mawr College
101 North Merion Avenue  ·  Bryn Mawr, PA  19010-2899 U.S.A.
Tel. (610) 526-5113  ·  Fax. (610) 526-5086   ·  Email:  aweil@brynmawr.edu

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 Education
  •  B.S., Geology, University of Oregon (1993)
  • M.S.,Geology, University of Michigan (1997)      
  • Ph.D., Geology, University of Michigan (2001)
Professional Experience

The University of Oregon

  • Worked with Columbia University and the University of Oregon on the Colorado Seismic Array
  • Research assistant for Dr. Ray Weldon
  • Geology Department, University of Oregon

US Geologic Survey

  • Research Scientist and field geologist (surface water hydrology) 

The University of Michigan

  • Graduate Research Assistant (1995 - 2001)
  • Graduate Teaching Assistant (1995 - 2001)
  • Geology Field-Camp Instructor (1997, 1998)
  • Paleomagnetic Laboratory manager (1997 - 2001)

Bryn Mawr College

  • Assistant Professor of structural geology/tectonics ( 2001 - 2007)
  • Associate Professor ( 2007 – present)
  • Department Chair (2008 – present)
General Research Interests    

Tectonics of fold-and-thrust belts, paleomagnetism applied to tectonic problems, kinematics of curved mountain belts, Variscan Europe, Precambrian paleogeography and tectonics, and the evolution and lifecycle of supercontinents.

Awards/ Grants
  • Outstanding Student Paper (Geomagnetism/Paleomagnetism Section) – Spring AGU 2000
  • Outstanding Student Paper (Tectonophysics Section) – Fall AGU 2001
  • NSF Academic Intern Fellowship
  • University of Michigan - F. Scott Turner Fellowship (1996-1999)
  • IRM Visiting Research Fellowship 1999 and 2002
  • Bryn Mawr College Faculty Grant 2002, 2004, 2006, 2009
  • NSF Research Grant 2004 – Three-Dimensional kinematic history of the Wyoming Salient: Implications for the development of curved orogens (136,466.00)
  • NSF Equipment Grant 2004 - Acquisition of new paleomagnetic lab equipment for Bryn Mawr College, Pennsylvania ($114,446.90)
Professional Societies

American Geophysical Union; Geological Society of America; Geological Society of Pennsylvania; Geologic Society of Philadelphia; Sigma XI Academic Society; European Geophysical Society

Graduate Advisors:

Dr. Rob Van der Voo and Dr. Ben A. van der Pluijm (both at The University of Michigan)

Peer Reviewed Publications:

1998
Weil, A.B., Van der Voo, Mac Niocaill, C., and Meert, G.M., 1998.  The Proterozoic supercontinent Rodinia: Paleomagnetically derived reconstructions for the 1,100 to 800 Ma interval, Earth Planet Sci. Lett., 154, 13-24.

2000
Karlstrom, Karl E., Bowring, S. A., Dehler, C.M., Knoll, A.H., Porter, S. M., Sharp, Z., Des Marais, D. J., Weil, A.B., Geissman, J. W., Elrick, M., Timmons, M. J., Keefe, K. and Crossey, L. J., 2000.  The Chuar Group of the Grand Canyon: Record of break up of Rodinia, associated change in the global carbon cycle, and eukaryotic diversification by 740 Ma, Geology, 28, 619-622.

Parés, J.M., Perez-Gonzalez, A., Weil, A.B. and Arsuaga, J.L., 2000. On the Age of the Hominid Fossils at the Sima de los Huesos, Sierra de Atapuerca, Spain: Paleomagnetic Evidence, American Journal of Physical Anthropology, 111, 451-461.

Weil, A.B., Van der Voo, R., van der Pluijm, B. and Parés, J.M., 2000. The Formation of an orocline by multiphased deformation: a paleomagnetic investigation of the Cantabria-Asturias Arc Hinge-Zone (northern Spain), Journal of Structural Geology, 22, 735-756.

2001
Weil, A.B., Van der Voo, R. and van der Pluijm, B. New paleomagnetic data from the southern Cantabria-Asturias Arc, northern Spain: Implications for true oroclinal rotation and the final amalgamation of Pangea, Geology, 29, 991-994, 2001.

2002
Weil, A.B. and Van der Voo, R., 2002 Insights into the mechanism for orogen related carbonate remagnetization from growth of authigenic Fe-oxide: A SEM and rock magnetic study of Devonian carbonates from northern, Journal of Geophysical Research, 107, B4.

*Weil, A.B, Van der Voo, R., Application of the paleomagnetic fold test to complex geologicenvironments: A case study from northern Spain, Physics and Chemistry of the Earth, 27, 1223-1235, 2002.

2003
Weil, A.B, Geissman, J., Heizler, M. and Van der Voo, R.  A paleomagnetic investigation of Middle Proterozoic mafic intrusions and Upper Proterozoic redbeds from the Lower Grand Canyon Supergroup, Arizona, Tectonophysics, 375,199-220,2003.

2004
Gutiérrez-Alonso, G., Fernández-Suárez, J. and Weil, A.B, Orocline triggered lithospheric delamination?, in: Paleomagnetic and structural analysis of orogenic curvature, Geologic Society of America Special Paper 383, 121-131, 2004.

Gutiérrez-Alonso, G., Fernández-Suárez, J. and Weil, A.B, Oroclinales y delaminacion: relaciones y efectos, Geo-Temas, 6(3), 69-74, 2004

Weil, A.B and Sussman, A., Classification of curved orogens based on the timing relationships between structural development and vertical-axis rotations, in: Paleomagnetic and structural analysis of orogenic curvature, Geologic Society of America Special Paper 383, 1-17, 2004.

Weil, A.B, Geissman, and Van der Voo, R.  Paleomagnetism of the Neoproterozoic Chuar Group, Grand Canyon Supergroup, Arizona: Implications for Rodinia break-up and Laurentia’s Neoproterozoic APWP, Precambrian Research, 129, 71-92, 2004.

Sussman, A. and Weil, A.B (editors), Paleomagnetic and structural analysis of orogenic curvature,Geologic Society of America Special Paper 383, p. 271.

2005
Ashby, J.M., Geissman, J.W., and Weil, A.B., Has the eastern end of the Uinta Mountains been bent?:  paleomagnetic and fault kinematic analysis, in: Geology of the Uinta Mountains, eds., Dehler, C.M., Pederson, J.L., Sprinkel, D.A., and Kowallis, B.J., U.G.A., Publication 33, 285-320, 2005.

2006
Weil, A.B., Geissman, J.W., and Ashby, J.M., A new paleomagnetic pole for the Neoproterozoic Uinta Mountain Supergroup, Central Rocky Mountain States, USA, Precambrian Research, PRECAM 2655, 1-26, 2006.

Weil, A.B., Kinematics of orocline tightening in the core of an arc: Paleomagnetic analysis of the Ponga Unit, Cantabria Arc, northern Spain, Tectonics, 25, 2005TC001861,1-23, 2006.

2008
Tohver, E., and Weil, A.B., A new technique for dating the absolute timing of carbonate remagnetization: Ar-Ar dating of clay transformation in Paleozoic carbonates, EPSL, 274 524-530.

Gabriel Gutiérrez-Alonso, J. Fernández-Suárez, A.B. Weil, J. Brendan Murphy,  R. Damian Nance, Fernando Corfú, Stephen T. Johnston, Self-subduction of the Pangean global plate, Nature Geoscience, 1, 549+-553.

Weil, A.B., and Yonkee, A., The power of integration: combining paleomagnetic data with structural analysis to better understand the kinematics and mechanics of complex orogens, in press Trabajos de Geologia.

2009
Weil, A.B., and Yonkee, A., Anisotropy of Magnetic Susceptibility as a proxy for layer parallel shortening and tangential extension: implications for mountain belt curvature in the Wyoming Salient, Lithosphere, 1, 4, 235-256.

2010
Gabriel Gutiérrez-Alonso, J. Brendan Murphy, Javier Fernández Suárez, Arlo B Weil, M. Piedad Franco, J. Carlos Gonzalo, Lithospheric mantle replacement in the core of Pangea: Sm-Nd insights from Iberia, submitted to EPSL.

Weil, A.B., Gabriel Gutiérrez-Alonso, Jordan Conan, New time constrains on lithospheric-scale oroclinal bending of the Ibero-Armorican Arc: a paleomagnetic study of earliest Permian rocks from Iberia, Journal of the Geological Society of London, 167, 127-173.

Weil, A.B., Yonkee, A., and Sussman, A., Reconstructing the kinematics of thrust sheet rotation: a paleomagnetic study of Triassic redbeds from the Wyoming Salient, U.S.A., GSA Bulletin, 122, ½ 2-23.

Yonkee, A., Weil, A.B., and Sussman, A., Reconstructing the kinematic evolution of curved mountain belts: internal strain patterns in the Wyoming Salient, Sevier thrust belt, U.S.A., GSA Bulletin, 122, ½, 24-50.

Yonkee, A., and Weil, A.B., Quantifying vertical-axis rotation in curved orogens: integrating multiple data sets with a refined weighted least-squares strike test, in press Tectonics.

Work in progress:
Coogan, J., Yonkee, A., and Weil, A.B., Cross-Section Restoration using strain and rotation data: Reconstructing the kinematics of the Wyoming Salient, U.S.A..

Weil, A.B., Gutiérrez-Alonso, G., Structural evolution of the Esla Nappe, constraining the late-stage history of oroclinal tightening.

Weil, A.B., Gage, J., and Pares, J., AMS analysis of the Brevard Shear Zone, Rosman, NC.

Selected Abstracts:

Ashby, J.M., Geissman, J.M. and Weil, A.B., 2001.  Paleomagnetic results from the Neoproterozoic Uinta Mountain Group, Utah and Colorado, Abstracts with Programs, GSA 2001 Annual Meeting.

Gage, J., Weil, A.W., and Pares, J., Preliminary AMS analysis of the Brevard Shear Zone, Rosman, NC, Abstracts with Programs, GSA 2004 Annual Meeting.

*Gutiérrez-Alonso, G., Fernández-Suárez, J. and Weil, A.B, Orocline triggered lithospheric delamination? Field-Workshop, Variscan to Post-Variscan fluid flow and Zn-Pb Mineralisation in Europe.

*Van der Voo, R., Weil, A. B. and Zegers, T, 1999.  The making of a supercontinent with paleomagnetic data, abstract for the Aarhus meeting.

*Van der Voo, R., Weil, A. B. and Peacor, D.R., 2000.  Paleomagnetism, Rock Magnetism, Mineralogy and Geochemistry of Remagnetized Carbonates: How Little Have We Learned About Models and Mechanisms for Remagnetizations, EOS Trans., Fall 1999 Meeting, 80, 45, p. F298.

*Van der Voo, R. and Weil, A. B., 2001. The Fold Test in Paleomagnetism, EGS abstracts, 2001 meeting, Annales Geophysicae.

*Weil, A.B., Van der Voo, R., Mac Niocaill, C., and Meert, J.G., 1996.  The Proterozoic Supercontinent Rodinia: a Paleomagnetic look at 1,100 to 800 Ma continental reconstructions, EOS Trans., Spring 1996 Meeting, 77, p. S87.

Weil, A.B, Geissman, J., Van der Voo, R. and Karlstrom, K., 1999.  Preliminary paleomagnetic results from a suite of Proterozoic dikes from the Grand Canyon Supergroup, Arizona, EOS Trans., Spring 1999 Meeting, 80, 17, p. S91.

*Weil, A.B., 2000.  Deformation induced remagnetization of carbonates: A rock magnetic and SEM perspective, Santa Fe V conference on Rock Magnetism.

Weil, A.B., A revised look at Laurentia’s Proterozoic Apparent Polar Wander Path: Implications for paleogeography and the Rodinia supercontinent, Abstracts with Programs, GSA 2001 Annual Meeting.

Weil, A.B, Geissman, J. and Van der Voo, R., Paleomagnetic results from the Upper Unkar Group and overlying Nankoweap Formation form the Grand Canyon Supergroup (GCSG), Arizona: Implications for Laurentia's Neoproterozoic APWP, EOS Trans., Fall 2001 Meeting, 82, 47, p. F315.

*Weil, A. B. and Sussman, A.J., Oroclines and other curved thrust belts: Clarification and Classification, GSA 2002 Annual Meeting.

Weil, A.B, Gutiérrez-Alonso and G., Fernández-Suárez, J., Orocline triggered lithospheric delamination, GSA 2003 Annual Meeting.

Weil, A.B., Deformation of Charelston Chew Candy Bars as a rheology analogue in the structural geology classroom, GSA 2004 Annual Meeting.

Weil, A.B., Sussman, A., and Yonkee, A., Determining the 3-D kinematic history of the Wyoming salient of the Sevier fold-thrust belt: Prelimenary results from a paleomagnetic investigation of the Triassic Ankareh Formation, GSA 2005 Annual Meeting.

Weil, A.B., DID VARISCAN EUROPE BEHAVE AS AN OROCLINALLY BENT RIBBON CONTINENT DURING THE LATEST CARBONIFEROUS?, GSA 2007 Annual Meeting.

*Weil, A.B., The power of integration: combining paleomagnetic data with structural analysis to better understand the kinematics and mechanics of complex orogens, AGU 2008 Spring Meeting.

*Weil, A.B., Our state of understanding the mechanisms for carbonate remagnetization: unraveling the causes and consequences for authigenic Fe-oxide production , AGU 2009 Spring Meeting.

Yonkee, A. and Weil, A.B., A refined statistical approach to the paleomagnetic strike test: applications to the Wyoming salient, Sevier fold-thrust belt, AGU 2007 Fall Meeting.

Yonkee, A. and Weil, A.B., Three-dimensional kinematic history of the Wyoming Salient of the Sevier orogenic belt, Backbone of Americas – Patagonia to Alaska, 2006.

* - Invited talks/papers.

Invited Talks and Lectures

Bryn Mawr College

              Science and Society

              Science and Society

              Spanish Colloquium

              Bucknell University

Colorado College

Franklin and Marshall College

Huelva University, Spain

Lafayette College

Lehigh University

Oviedo University, Spain

University of California at Santa Cruz

University of Michigan – Smith Lecture Series

University of Minnesota – Institute of Rock Magnetism

University of Salamanca, Spain

Utah State University

West Chester University

 Convened Professional Meeting Sessions

2000      -             Rock- and Paleo-Magnetism

                            American Geophysical Union 2000 Spring Meeting

2001      -             Geomagnetism and Paleomagnetism

                            American Geophysical Union 2001 Fall Meeting

2002      -             Topical Session - Thrust Belt Curvature

                            Geological Society of America 2002 National Meeting

2007      -             New Innovations in Rock- and Paleo-Magnetism

                            American Geophysical Union 2007 Fall Meeting

Professional Service
  • Member of the executive committee for the Structural Geology and Tectonics division of the Geological Society of America (Best Paper Award Committee)
  • Associate Editor of the Geological Society of America Bulletin
 
Refereed Publications

Tectonophysics (8 papers), EPSL (6 papers), Geofluids (2 papers), Geology (3 paper), Geophysical Journal International (6 paper), GSA Special Paper (Volume 364), GSA Bulletin (5 papers), Tectonics (8 papers), Journal of Geophysical Research (6 papers), Geophysical Research Letters (3 paper)

Teaching

Courses Taught, Bryn Mawr College (2001 – present)

  • GEOL 101 How the Earth Works
  • GEOL 204 Structural Geology
  • GEOL 209 Natural Hazards and Human Populations
  • GEOL 304 Tectonics
  • GEOL 310 Geophysics
  • GEOL 350 Precambrian Paleomagnetism
  • GEOL 610 Advanced Structure
  • GEOL 630 Advanced Tectonics
Research Project Supervision
  • Sara Toursher - Shear Sense Indicators, Geochemistry and Field Studies of Mylonitized Phenix City Gneiss in West Georgia, in completion of a senior thesis (2002).
  • Amanda Rogers - Paleomagnetic investigation of the Uinta Mountain Supergroup: Implications for the Proterozoic Rodinia Supercontinent, Bryn Mawr Summer Science Research Program (2002).
  • Kira Tushman - Formation of Curved Mountain Belts: An investigation of the Wyoming Fold-Thrust Belt, Bryn Mawr Summer Science Research Program (2003).
  • Sara Nicole McCullough - Geologic Investigation of the Wyoming Fold-Thrust Belt, Bryn Mawr Summer Science Research Program (2003).
  • Kira Tushman - Senior Thesis Research Project on the structural geology of the Wyoming Salient, completion date: Winter 2003.
  • JoAnn Gage - Marshall Fellowship Research Project: Anisotropy of Magnetic Susceptibility study of the Brevard Zone, North Carolina - Summer 2004.
  • Melissa Lindholm - Kinematics of the Wyoming Fold-Thrust Belt, Bryn Mawr Summer Science Research Program (2004).
  • Andrea Cutruzzula - An Investigation of the Wyoming Salient: The What, When, Where, and Why of Mountain Belt Curvature, Bryn Mawr Summer Science Research Program (2004).
  • Mathew Tomich – Wyoming Geology, Bryn Mawr Summer Science Research Program (2005).
  • Evan Pugh – Wyoming Geology, Bryn Mawr Summer Science Research Program (2005).
  • Anna Mazzariello – Permian Rotations in Iberia, a study of oroclinal bending, Bryn Mawr Summer Science Research Program (2006).
  • Zoe Ruge – Wyoming Geology and Paleomagnetism, Funded from NSF Grant (Summer 2006)
  • Alexi Ernstoff – Structure of the Canadian Rocky Mountains, Bryn Mawr Summer Science Research Program (2007).
  • Jordan Conan - Time constraints on oroclinal bending of the Cantabria-Asturias Arc: a paleomagnetic study from northern Iberia, in completion of a senior thesis (2008).
 
College Committees
  • Science Laboratory Safety Committee                                                          2001 - present
  • Independent Majors Committee                                                                   2002 - 2005
  • College Admissions    (Chair)                                                                       2006 – 2009
  • Geology Department Chair                                                                          2008 - present