After reading the guide, we had two more places we wanted to see while in the Mammoth Lakes area. The first was Obsidian Dome. You know how much we love obsidian. Well, the dome was both impressive and a disappointment.
Although you can't tell from the pictures, it was the biggest and most impressive mountain of rocks I've ever seen.
But it was clearly was not all obsidian. Even the pieces that were obsidian were not pure, forming this interesting striped appearance. They were very pretty though.
Well, we discovered why there was a road. Obviously the site had been used as a rock quarry, probably before it was protected. But what were they quarrying for?
We're thinking pumice. It was everywhere.
From our visit to the Obsidian Flow in Deschutes National Forest in Oregon, we learned that pumice and obsidian are related. Obsidian is solid glass with no bubbles and pumice is frothy glass with big bubbles.
The other place we wanted to see was Hot Creek Geological Site, created by eruptions 700,000 years ago. There was a pictorial sign to explain the process.
There were signs warning that people have died or been seriously burned. Really? They couldn't see that it was hot?
We looked for the periodic geysers, but this was the most activity we saw.
It was a very pretty walk along Hot Creek - just watch out for the steaming hot spots.