Then he consulted his map before leaving the path for the uneven footing of old lava.

The rock was old lava, easily a billion years old.

Its center contains 377.5 km of volcanic material, mainly 0.23-1.18 million years old lava.

Mykel dropped behind an irregular chunk of old black lava.

The oldest lava flows on the island date back to 750,000 years ago.

The oldest lava flows that are still exposed at the surface are just under 0.78 million years old.

The trail crosses both old and new lava flows from the active volcano.

From there to the summit, they advance at their discretion up a ridge of old lava.

The top of the mesa was black with the old lava that gave it its name.

The oldest lava dated from the volcano are about 3.9 million years old.