GSA Today
Volume 33, Issue 10

Cover image

A false color radar image of a “bird’s foot” terminus of the Mississippi River Delta (63 x 43 km). Bright spots on the main chan- nel are ships. Over the past 200 years, upstream Mississippi has been heavily modified through damming and diversions, and sediment influx to the delta has been reduced dramatically from 400 to 100- 150 million tons annually. Subsidence has more than tripled in areas of oil extraction and over 5000 km2 of deltaic wetlands have been lost since the 1930s. (Credit: NASA/JPL image archives).

© The Geological Society of America, Inc.