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SEPTEMBER 2017 | VOLUME 27, NUMBER 9 SCIENCE

GSA TODAY (ISSN 1052-5173 USPS 0456-530) prints news 4 The New World of 3D Geologic Mapping
and information for more than 26,000 GSA member readers Terry L. Pavlis and Kelsey A. Mason
and subscribing libraries, with 11 monthly issues (March/
April is a combined issue). GSA TODAY is published by The Cover: Perspective view (above) and partially interpreted
Geological Society of America® Inc. (GSA) with offices at anaglyph stereo view (below) of 3D terrain model developed
3300 Penrose Place, Boulder, Colorado, USA, and a mail- from ground-based Structure-from-Motion photogrammetry
ing address of P.O. Box 9140, Boulder, CO 80301-9140, USA. in Surprise Canyon, western Panamint Mountains, California,
GSA provides this and other forums for the presentation USA. View is toward the north. Note how a distinctive schist
of diverse opinions and positions by scientists worldwide, unit mapped as white lines in the lower image outlines a
regardless of race, citizenship, gender, sexual orientation, sub-isoclinal recumbent fold that is refolded by an upright
religion, or political viewpoint. Opinions presented in this antiform in the foreground but is distinctly different on the
publication do not reflect official positions of the Society. ridge in the background. See related article, p. 4–10.

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