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Photographer's Note

White and Yellow

Okay, just one more close-up of the travertine rock formations at Mammoth Hot Springs in Yellowstone National Park. The travertine terraces are created by the interaction of water and limestone. Hot water travels underground from Norris Geyser Basin through a fault line to Mammoth Hot Springs. Along the way the water picks up calcium carbonate, which it deposits after surfacing at Mammoth at a temperature of around 80 degrees Celsius. Algae create the brown, orange, red, and green colours of the travertine, but as soon as a part of the rock dries up, it turns white quickly. The terraces are among the fastest changing features in the park.

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Exif Data:
Make: SONY
Model: DSC-HX400V
Software: PaintShop Pro 16,00
Exposure Time: 1/1250 sec
F-Stop: f/4.0
ISO Speed Ratings: 80
Focal Length: 2068/100 mm
Date Taken: 2019-07-31 10:35
Metering Mode: Pattern
Flash: Flash did not fire, compulsory flash mode
File Size: 2407 kb

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Additional Photos by Lars Zwemmer (Tue) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 12808 W: 57 N: 22662] (85806)
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