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 GSA Today, v. 9, no. 10, October 1999


Table of Contents

Science Article: (View Abstract)
Refining Rodinia: Geologic Evidence for the Australia-Western U.S. connection in the Proterozoic
by Karl E. Karlstrom, Michael L. Williams, James McLelland, John W. Geissman, Karl-Inge Åhäll

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Memorial Preprints 2
In Memoriam 3
SAGE Remarks: Redesigning the Geological Map for the Public Audience 8
Dialogue 10
Washington Report-Defining a National Environmental Framework Continues 11
Penrose Conference Report-Mid-Cretaceous to Recent Plate Boundary Processes in the Southwest Pacific 13
Geochemist, Petrologist Named Honorary Fellows 16
GSA Penrose Medal, Day Medal, and Honorary Fellows 18
GSA on the Web 18
Young Scientist Award 20
Call for Nominations—National Awards for 2002 22
Call for Nominations—2000 GSA Distinguised Service Award 22
GSA Division and Section Grants 1999 23
Call for Nominations—2000 John C. Frye Environmental Geology Award 24
Call for Nominations—GSA Public Service Award 24
Call for Geological Papers for 2000—GSA Sections and Annual Meetings 25
Call for Nominations—Planetary Geoscience Student Paper Award 25
2000 Research Grants Program for Students 26
2000 North-Central Section Meeting 27
2000 Rocky Mountain Section Meeting 28
2000 Cordilleran Section Meeting 30
GSA Foundation Update 31
Bulletin and Geology Contents 34
Calendar 35
Classifieds 35

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Refining Rodinia: Geologic Evidence for the Australia–Western U.S. connection in the Proterozoic
Karl E. Karlstrom, Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131
Stephen S. Harlan, Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131.
Present address: P.O. Box 25046, MS 980, Federal Center, Denver, CO 80225
Michael L. Williams, Department of Geosciences, University of Massachusetts, Amherst, MA, 01003-5820
James McLelland, Department of Geology, Colgate University, Hamilton, NY 13346
John W. Geissman, Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131
Karl-Inge Åhäll, Earth Sciences Centre, Göteborg University, Box 460, SE-405 30 Göteborg, Sweden

Prior to the Grenvillian continent-continent collision at about 1.0 Ga, the southern margin of Laurentia was a long-lived convergent margin that extended from Greenland to southern California. The truncation of these 1.8–1.0 Ga orogenic belts in southwestern and northeastern Laurentia suggests that they once extended farther. We propose that Australia contains the continuation of these belts to the southwest and that Baltica was the continuation to the northeast. The combined orogenic system was comparable in length to the modern American Cordilleran or Alpine-Himalayan systems. This plate reconstruction of the Proterozoic super-continent Rodinia called AUSWUS (Australia–Southwest U.S.) differs from the well-known SWEAT (Southwest U.S.–East Antarctic) reconstruction in that Australia, rather than northern Canada, is adjacent to the southwestern United States. The AUSWUS reconstruction is supported by a distinctive "fingerprint" of geologic similarities and tectonic histories between Australia and the southwestern United States from 1.8 to 0.8 Ga, and by a better agreement between 1.45 and 1.0 Ga paleomagnetic poles for Australia and Laurentia.

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