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2020  NOVEMBER 2019  |  VOLUME 29, NUMBER 11   SCIENCE





                                                      Subduction Polarity in Ancient Arcs: A Call to
                                                4
                                                      Integrate Geology and Geophysics to Decipher
                                                      the Mesozoic Tectonic History of the Northern
       GSA TODAY (ISSN 1052-5173 USPS 0456-530) prints news
                                                      Cordillera of North America
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 CALENDAR  and information for more than 22,000 GSA member readers   Cover: Early Jurassic blueschist facies metamorphic rocks from
                                                      Terry L. Pavlis et al.
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       GSA provides this and other forums for the presentation
                                                along the forearc-accretionary complex boundary of the outermost
       of diverse opinions and positions by scientists worldwide,
                                                Early Jurassic arc in the Northern Cordillera. The outcrop shows
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       religion, or political viewpoint. Opinions presented in this
                                                and mudstone protolith. The coeval development of the arc and subduction complex and later
       publication do not reflect official positions of the Society.  interlayered quartz and Fe- and Mg-rich pelite, interpreted as a chert
       © 2019 The Geological Society of America Inc. All rights   tectonic juxtaposition along the backstop of the Chugach accretionary complex indicate polarity
       reserved. Copyright not claimed on content prepared   of subduction was dipping east or north in present-day coordinates. Photo by Sarah Roeske.
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