The mountain is still active, and has erupted 3 times in the last 100 years. The last lava flow was in 1975 and is seen here as a darker stain on the side of the mountain. We tend to think of these things as happening in the distant past, but that’s not the case here.

This is a cutaway bit of the track about 1200mm high at the top of the mountain.  Note the different layers of deposition from the various eruptions.  The bottom layer was warm and steaming, and remarkably, sandflies were  prolific up there.