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MAY 2018 | VOLUME 28, NUMBER 5 SCIENCE

GSA TODAY (ISSN 1052-5173 USPS 0456-530) prints news 4 Is the “Grenville Front” in the central United
and information for more than 26,000 GSA member readers States really the Midcontinent Rift?
and subscribing libraries, with 11 monthly issues (March/ Carol A. Stein et al.
April is a combined issue). GSA TODAY is published by The
Geological Society of America® Inc. (GSA) with offices at Cover: (Top) Traditional geometry for the relationship
3300 Penrose Place, Boulder, Colorado, USA, and a mail- between the Midcontinent Rift and Grenville Front. The
ing address of P.O. Box 9140, Boulder, CO 80301-9140, USA. Grenville Front truncates the east arm of the Midcontinent
GSA provides this and other forums for the presentation Rift and extends southward along a set of subsurface fea-
of diverse opinions and positions by scientists worldwide, tures indicated by gravity and magnetic anomalies.
regardless of race, citizenship, gender, sexual orientation, (Bottom) Revised geometry proposed in this issue by Stein
religion, or political viewpoint. Opinions presented in this et al. (2018). The previously assumed Grenville Front in the
publication do not reflect official positions of the Society. central U.S. is in fact the southward continuation of the
© 2018 The Geological Society of America Inc. All rights Midcontinent Rift. See related article, p. 4–10.
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