After Hurricane Katrina, the fanlike pile of sand, mud, and silt that formed near a breached levee was unique in the urban environment of New Orleans. Over the 7,500-year history of the modern Mississippi River delta, however, it was just another splay deposit. Author Darwin Spearing explains the geologic forces behind the formation of the delta, shedding light on the human struggle to control the powerful river that breaches its own levees and switches its own deltas. With sections on wetland loss and land subsidence, Roadside Geology of Louisiana is a must-read for understanding the vulnerability of the Mississippi River delta to floods and hurricanes.

First published in 1995, Roadside Geology of Louisiana is back in print by popular demand, with several updated sections. The introduction presents an overview of Loiusiana's geological history, and 57 road guides discuss the landforms visible from a car window, including sand ridges, natural levees, oxbow lakes, and the Five Islands salt domes.