GSA Today
Volume 28, Number 5 (May 2018)

Cover image

About the cover:
(Top) Traditional geometry for the relationship between the Midcontinent Rift and Grenville Front.  The Grenville Front truncates the east arm of the Midcontinent Rift and extends southward along a set of subsurface features indicated by gravity and magnetic anomalies. (Bottom) Revised geometry proposed in this issue by Stein et al. (2018).  The previously assumed Grenville Front in the central U.S. is in fact the southward continuation of the Midcontinent Rift. See related article, p. 4–10.

doi: 10.1130/GSATG357A.1

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