This large lava field, over 170 square miles (440 km²), erupted about 760,000 years ago, and was a slow and viscous lava which produced a very rough surface which made travel across it even more difficult.
This large lava field, over 170 square miles (440 km²) in size and called the Jornada del Muerto Volcano by volcanologists, erupted about 760,000 years ago. It was a slow and viscous aa lava which produced a very rough surface, making travel across it even more difficult.