Page 3 - i1052-5173-30-12

DECEMBER 2020 | VOLUME 30, NUMBER 12
SCIENCE

4 The Mesoproterozoic Single-Lid Tectonic Episode:
Prelude to Plate Tectonics
Robert J. Stern
GSA TODAY (ISSN 1052-5173 USPS 0456-530) prints news
and information for more than 22,000 GSA member readers
and subscribing libraries, with 11 monthly issues (March- Cover: Typical coarse-grained to pegmatitic, orthopyroxene-bearing
April is a combined issue). GSA TODAY is published by The anorthosite (leuconorite) from the 1765–1630 Ma Mealy Mountains Intrusive Suite (Labrador,
Geological Society of America Inc. (GSA) with offices at Canada). This Mesoproterozoic anorthosite massif intrudes the Mealy Mountains Terrane and is
®
3300 Penrose Place, Boulder, Colorado, USA, and a mail- one of several classic intrusive complexes in the Grenville Province of eastern North America.
ing address of P.O. Box 9140, Boulder, CO 80301-9140, USA.
GSA provides this and other forums for the presentation The hammer is ~40 cm long. Photo courtesy of Grant Bybee, Univ. of the Witwatersrand. See
of diverse opinions and positions by scientists worldwide, related article, p. 4–10.
regardless of race, citizenship, gender, sexual orientation,
religion, or political viewpoint. Opinions presented in this
publication do not reflect official positions of the Society.
© 2020 The Geological Society of America Inc. All rights
reserved. Copyright not claimed on content prepared
wholly by U.S. government employees within the scope of
their employment. Individual scientists are hereby granted
permission, without fees or request to GSA, to use a single 12 Call for Nominations: 2021 GSA Awards & Medals
figure, table, and/or brief paragraph of text in subsequent
work and to make/print unlimited copies of items in GSA 12 Call for GSA Fellowship Nominations
TODAY for noncommercial use in classrooms to further
education and science. In addition, an author has the right
to use his or her article or a portion of the article in a thesis 13 2020–2021 Scientific Division Officers and Past Chairs
or dissertation without requesting permission from GSA,
provided the bibliographic citation and the GSA copyright
credit line are given on the appropriate pages. For any 14 Scientists in Parks: A New Program for the Next Generation of Stewards
other use, contact editing@geosociety.org.
Subscriptions: GSA members: Contact GSA Sales & Service, 15 GeoCorps™ America: Explore Geoscience-Related Opportunities on America’s
+1-888-443-4472; +1-303-357-1000 option 3; gsaservice@ Public Lands
geosociety.org for information and/or to place a claim for
non-receipt or damaged copies. Nonmembers and institutions:
GSA TODAY is US$105/yr; to subscribe, or for claims for 16 2019–2020 GSA-USGS Congressional Science Fellow Final Report
non-receipt and damaged copies, contact gsaservice@
geosociety.org. Claims are honored for one year; please 17 Mentoring365
allow sufficient delivery time for overseas copies. Peri-
odicals postage paid at Boulder, Colorado, USA, and at
additional mailing offices. Postmaster: Send address 18 GSA Graduate Student Research Grants
changes to GSA Sales & Service, P.O. Box 9140, Boulder, CO
80301-9140. 18 Awards for Students to Attend GSA’s Northeastern Section Meeting
GSA TODAY STAFF
Executive Director and Publisher: Vicki S. McConnell 18 J. David Lowell Field Camp Scholarships
Science Editors: Mihai N. Ducea, University of Arizona,
Dept. of Geosciences, Gould-Simpson Building, 1040 E 4th 20 Geoscience Jobs & Opportunities
Street, Tucson, Arizona 85721, USA, ducea@email.arizona
.edu; Peter Copeland, University of Houston, Department 23 GSA Publications Highlights: Share Your Research with the World. Publish
of Earth and Atmospheric Sciences, Science & Research
Building 1, 3507 Cullen Blvd., Room 314, Houston, Texas with GSA.
77204-5008, USA, copeland@uh.edu.
Managing Editor: Kristen “Kea” Giles, kgiles@geosociety.org, 24 Groundwork: A Three-Dimensional, Virtual Tour of the Johnston Geology
gsatoday@geosociety.org Museum
Graphics Production: Emily Levine, elevine@geosociety.org
Advertising Manager: Ann Crawford, 26 Groundwork: It’s Time to Defuse the Cambrian “Explosion”
+1-800-472-1988 ext. 1053; +1-303-357-1053;
Fax: +1-303-357-1070; advertising@geosociety.org 28 GSA Foundation Update
GSA Online: www.geosociety.org
GSA TODAY: www.geosociety.org/gsatoday 29 2021 GSA Section Meetings
Printed in the USA using pure soy inks.
30 Call for GSA-USGS Congressional Science Fellow
31 Call for Short Course and Technical Session Proposals: GSA 2021
Annual Meeting