********************************************************** From: Sarah Hanson <slhanson@xxxxxxxxxx> ********************************************************** Field trip Announcement: There will be a post-meeting field trip (21-23 March) following the combined Rocky Mountain / Cordilleran section of the Geological Society of America meeting in Las Vegas (19-21 March 2008). See below: Quaternary Volcanism in the San Francisco Volcanic Field: Recent Cinder Cone Eruptions that Profoundly Affected the Northern Arizona Physiography and Life of the Ancestral Pueblo Indians. Sat.-Sun., 22-23 March (2 days; 3 nights: leaves UNLV at 5 p.m. on Fri., 21 March, and returns at 9 p.m. on Sun., 23 March). Sarah L. Hanson, Adrian College, +1-517-264-3944; Wendell Duffield. Cost: US$280; includes lunches, lodging, transportation, and a copy Volcanoes of Northern Arizona by Wendell Duffield. Max: 22. The San Francisco Volcanic Field in northern Arizona hosts over 600 volcanoes ranging in age from 6 Ma to <1000 yr. The more recent activity occurred in the eastern portion of the field-building Sunset Crater cinder cone (ca. A.D. 1080) and Merriam Crater, the Sproul, and two unnamed cinder cones (ca. 20 ka). Sunset Crater produced Strombolian eruptions and two lava flows. One, or several, of the older vents, ~20 km ESE of Sunset Crater, produced the Grand Falls flow that dammed the Little Colorado River and created Grand Falls. This two-day trip will explore the eruptive products as well as the physiographic and cultural and effects of these eruptions. Field locations at Sunset Crater will include the eruptive products from the Strombolian eruption, the Bonito lava flow, hornitos, squeeze-ups, and related fissure deposits. Grand Falls locations will include the lava dam at Grand Falls, flows in the Colorado River channel, and an older lava dam just north of Grand Falls. ============================================================== To unsubscribe from the volcano list, send the message: signoff volcano to: listserv@xxxxxxx, or write to: volcano-request@xxxxxxxx To contribute to the volcano list, send your message to: volcano@xxxxxxxx Please do not send attachments. ==============================================================
