These rocks have been dated as no younger than 3.85 billion years.

Volcanic rocks from the western slope have been dated to about seven million years, so the volcano is thought to be extinct.

Some rocks in the area have been dated to over 250 million years old.

Volcanic rocks at about the same level have been dated to 76.9 1.2 million years ago.

These rocks have been dated as about 3.465 billion years ago.

Metamorphic rocks can occasionally be dated, and this may give some limits to the age at which a bed could have been laid down.

Sedimentary rock and fossils found in the park are also dated back 400 million years, an indication that the area was once a sea.

The volcano is quite old, as its rocks have been dated to 5.6-1.4 million years.

These rocks have recently been dated between 539 and 618 million years old [ref.

You are now a vertical mile below the rim and the rocks have been dated to the immense age of 2000 million years.