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Black Pool, northern Lower Group, West Thumb Geyser Basin, Yellowstone Hotspot, northwestern Wyoming, USA in August 2011.
Black Pool is a very hot, moderately deep, irregularly-outlined, and intensely blue- to deep turquoise-colored. It was formerly a deep greenish-black color, from the presence of yellowish extremophile bacterial mats on the pool walls and floor. Subsequent natural heating of this feature has knocked out most of the bacterial mats. Abundant, suspended, <0.5µ-sized, colloidal silica particles are responsible for the blue coloration of the water.
In 1991 and 1992, Black Pool had atypical activity, coinciding with activity at nearby Abyss Pool. One explosive eruption here in August 1991 involved the forceful detachment and nearby deposition of geyserite clasts. Boiling water domes up to 3 feet high were present in the pool after that eruption, accompanied by significant overflow.
Small eruptions also occurred at Black Pool in 1992.
This pool at the San Diego zoo is the housing for flamingos, ducks, a few smaller aquatic birds and a couple of peacocks, but the flamingos clearly dominated this place, both in numbers and noises.
I was very surprised to see the flamingo chicks were completely white, with no trace of the pink color. Please see the photo below.
Leica S2 + 70mm Summarit-S / 2.5
S2000387
Title: Alumni Hall Pool photograph
Date: unknown
Description: This photograph shows the swimming pool that used to be located in the basement of Alumni Hall. Several young men are swimming. This picture would have been taken between 1907 and 1914.
Image ID: 4-8-Alumni Hall pool
This work has been identified as being free of known restrictions under U.S. copyright law, including all related and neighboring rights. The organization that has made this item available believes that the item is in the Public Domain under the laws of the United States, but a determination was not made as to its copyright status under the copyright laws of other countries. (CC Public Domain 1.0 and RightsStatements.org NoC-US 1.0). The original object is available at the Iowa State University Library Special Collections and University Archives (archives@iastate.edu). To request higher resolution reproductions of the original visit our website.