Cover image:
Basaltic lava flow with vertical columnar jointing that crops out in the Aguacatitla canyon, Hidalgo State, Mexico, at the northeastern Trans-Mexican Volcanic Belt. These lavas were erupted from fissures and are part of the Pliocene-Quaternary Atotonilco Formation. Person for scale at the bottom right corner. Photo: Teresa Orozco.
Published:
2013-08-29
