Volume 23, Number 6 (June 2013)
About the cover:
Ikonos satellite image of the Upper Geyser Basin region in Yellowstone National Park. Light colored areas are silica-rich geothermal deposits (sinter). The drainage pattern from Old Faithful appears to be mainly to the north (top) to the Firehole River. Source: DigitalGlobe.
© The Geological Society of America, Inc.