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Date: August 23, 2010
Location: Black Sand Basin, Yellowstone National Park, WY
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A wide overflow area has yellow and orange bacteria growing in it. The water itself is a deep emerald green. Between 2010 when I first saw it and 2019, the overflow area has shifted from the back of the pool to the front of the pool
Date: July 14, 2019
Location: Black Sand Basin, Yellowstone National Park, WY
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A beautiful blue in the center, where it is deepest. The edges of the pool has a fringe of yellow and orange.
Date: August 23, 2010
Location: Black Sand Basin, Yellowstone National Park, WY
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This pool isn't clear like most others, it is a milky blue color. The shape and appearance of the pool changes depending on how high the water is. If the water is lower, there is a 6 inch high wall on the far side, if it is higher then the pool is larger, coming several feet towards the front of the picture. You can see scum line of orange bacteria towards the front left which shows how large this pool can get.
Date: July 14, 2019
Location: Biscuit Basin, Yellowstone National Park, WY
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Water surges out of this cave and it makes a rumbling sound.
Date: August 27, 2010
Location: Mud Volcano, Yellowstone National Park, WY
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Date: August 23, 2010
Location: Upper Geyser Basin, Yellowstone National Park, WY
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The spring has steep walls, so the water only flows out in one area. The outflow is colored deep orange by microbes.
Date: July 13, 2019
Location: Upper Geyser Basin, Yellowstone National Park, WY
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Named because of the small crest of rock that rims the spring.
Date: August 25, 2010
Location: Upper Geyser Basin, Yellowstone National Park, WY
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Crested pool has about a 3 inch high "crest" around it. Here the pool is bubbling violently, sometimes it is boiling, sometimes it is calm.
Date: July 14, 2019
Location: Upper Geyser Basin, Yellowstone National Park, WY
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Date: August 25, 2010
Location: Upper Geyser Basin, Yellowstone National Park, WY
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I don't think this pool has a name. Most pools are clear in the center and get color around the edges, because the center is too hot to support bacteria. This one has a yellow bacterial mat in the center which means it is cooler than most pools.
Date: July 13, 2019
Location: Upper Geyser Basin, Yellowstone National Park, WY
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This is just a small part of Doublet Pool. I like the factal nature of the edge of it here.
Date: July 13, 2019
Location: Upper Geyser Basin, Yellowstone National Park, WY
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Date: August 25, 2010
Location: Upper Geyser Basin, Yellowstone National Park, WY
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Where there is a wide stretch of several inch teep hot water, the bacteria colonies form into 3-D textured mats such as this one.
Date: July 15, 2019
Location: Upper Geyser Basin, Yellowstone National Park, WY
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The area has a one mile loop trail that goes through forest, meadow, and up a steep hill. The steam in the center of the pictures is coming up from Blood Geyser.
Date: July 15, 2019
Location: Artist Paint Pots, Yellowstone National Park, WY
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The Firehole river passes right through Upper Geyser Basin and most of the runoff from the springs and geysers eventually makes it into this river.
Date: August 25, 2010
Location: Upper Geyser Basin, Yellowstone National Park, WY
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In the early morning there is more steam coming from the thermal features along the river, it gives a slightly different experience than later in the day.
Date: July 14, 2019
Location: Upper Geyser Basin, Yellowstone National Park, WY
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