doi:10.1130/0016-7606(1988)100<1640:MMCCIT>2.3.CO;2 1988;100;1640-1656 Geological Society of America Bulletin CHARLES N. ALPERS and GEORGE H BRIMHALL from supergene mineralization at La Escondida Middle Miocene climatic change in the Atacama Desert, northern Chile: Evidence Geological Society of America Bulletin on 5 February 2009 gsabulletin.gsapubs.org Downloaded from E-mail alerting services cite this article to receive free e-mail alerts when new articles www.gsapubs.org/cgi/alerts click Subscribe Society of America Bulletin to subscribe to Geological www.gsapubs.org/subscriptions/index.ac.dtl click Permission request to contact GSA http://www.geosociety.org/pubs/copyrt.htm#gsa click presented in this publication do not reflect official positions of the Society. scientists worldwide, regardless of their race, citizenship, gender, religion, or political viewpoint. Opinions citation. GSA provides this and other forums for the presentation of diverse opinions and positions by on their own or their organization's Web site providing the posting includes a reference to the article's full science. This file may not be posted to any Web site, but authors may post the abstracts only of their articles unlimited copies of items in GSA's journals for noncommercial use in classrooms to further education and use a single figure, a single table, and/or a brief paragraph of text in subsequent works and to make employment. Individual scientists are hereby granted permission, without fees or further requests to GSA, to Copyright not claimed on content prepared wholly by U.S. government employees within scope of their Notes © 1988 Geological Society of America