Lower – Upper Thermal Basins

July 16, 2015:  Besides Midway Geyser Basin, here are some other thermal areas on the way to Old Faithful:

Biscuit Basin - Sapphire Pool

Biscuit Basin – Sapphire Pool

“The name Biscuit Basin was adopted in the late 1880s because of the unusual biscuit-shaped geyserite formations that used to surround Sapphire Pool. Following the 1959 Hebgen Lake earthquake, Sapphire erupted—and the “biscuits” were blown away.” This pool was fascinating and looked so deep!

Black Sand Basin geyser

Black Sand Basin:

In the Upper Geyser Basin, I heard a tour guide say that he always brought tours here because this geyser was always spouting off.

It didn’t go very high, but it was still fun to watch.

Black Sand - Emerald Pool

Emerald Pool

It broke my heart to read how this pool has changed color over the years due to stupid people throwing stuff into it:  “Objects thrown into the pool and natural debris have caused a further decrease in temperature, resulting in a change of bacteria and algae growth and thus a change of color. The edge of the pool is now orange and brown. If the temperature continues to decrease, the pool may lose its emerald color.”  WTH, people?!

Black Sand Basin - Sunset Lake

Sunset Lake

Black Sand Basin

My favorite Black Sand Basin scene – ribbons of color flowing into the water.

Fountain Paint Pots

Fountain Paint Pot

Located in the Lower Geyser Basin, the mud is composed of clay and fine particles of silica broken down by acids and grinding action. The tinting of the mud in colors of pink and gray from iron oxides is derived from the original rock.

15 seconds of gurgling Fountain Paint Pots

Fountain Paint Pots - Celestine Pool

Celestine Pool – A beautiful nearby hot spring

Fountain Paint Pots - Silex Spring

Silex Spring

Fountain Paint Pots - Bacteria Mat

Bacteria Mat – who would have thought it could create something so beautifully colored?

arrow-rightScenic Loop Drives – Firehole Lake or Firehole Canyon

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