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FEBRUARY 2021 | VOLUME 31, NUMBER 2
2020 GSA PRESIDENTIAL
ADDRESS

4 Geology in an Online World
J. Douglas Walker
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Erratum: The cover photo caption for the January 2021 issue of GSA Today was misidentified as Steens
Mountain. The photo accompanying the science article by Victor E. Camp and Ray E. Wells shows Abert
Rim, 30 km north of Lakeview, Oregon, USA. Description: The break in slope is coincident with a discon-
tinuity representing a regional three- to five-million–year hiatus separating two distinct styles of volcanic
activity in the Cascadia backarc region. The lower slope is composed of high-K calc-alkaline lavas derived
from melting of a hydrated mantle source from 30 to 20 Ma. The steeper upper slope is composed of thin
flows of the tholeiitic Steens Basalt (early lavas of the Columbia River Basalt Group) derived from melting
of a dry mantle source with a plume component at ca. 17 Ma. GSA Today regrets this error.