Photography Now & Then #128
Even though we are not in the deep, deep south, summer sometimes seems to arrive too early. It was just a few weeks ago that trees were bare of leaves and, now, the leaves are fully formed with the colors moving from springtime freshness toward the deep green of summer.
And we’re already getting temperatures in the 90s. The droning buzz of cicadas can’t be far away.
Now: Summer temperatures in early May, west-central Arkansas, May 9, 2018 (Apple iPhone 6s)
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This was such a beautiful day to visit Mammoth Hot Springs. The next time we were there, 4 years later, we dodged rainstorms when we were down in the Mammoth Hot Springs Historic District.
Then: Mammoth Hot Springs, boardwalk to the top of the terraces, Yellowstone National Park, Wyoming, August 10, 2010 (Pentax K10D)
Mammoth Hot Springs (Wikipedia)
Mammoth Hot Springs is a large complex of hot springs on a hill of travertine in Yellowstone National Park adjacent to Fort Yellowstone and the Mammoth Hot Springs Historic District. It was created over thousands of years as hot water from the spring cooled and deposited calcium carbonate (over two tons flow into Mammoth each day in a solution). Because of the huge amount of geothermal vents, travertine flourishes. Although these springs lie outside the caldera boundary, their energy has been attributed to the same magmatic system that fuels other Yellowstone geothermal areas.
The hot water that feeds Mammoth comes from Norris Geyser Basin after traveling underground via a fault line[5] that runs through limestone and roughly parallel to the Norris-to-Mammoth road. The limestone from rock formations along the fault is the source of the calcium carbonate. Shallow circulation along this corridor allows Norris’ superheated water to slightly cool before surfacing at Mammoth, generally at about 170 °F (80 °C). Algae living in the warm pools have tinted the travertine shades of brown, orange, red, and green.
Thermal activity here is extensive both over time and distance. The thermal flows show much variability with some variations taking place over periods ranging from decades to days.[6] Terrace Mountain at Mammoth Hot Springs is the largest known carbonate-depositing spring in the world. The most famous feature at the springs is the Minerva Terrace, a series of travertine terraces. The terraces have been deposited by the spring over many years but, due to recent minor earthquake activity, the spring vent has shifted, rendering the terraces dry.
The Mammoth Terraces extend all the way from the hillside, across the Parade Ground, and down to Boiling River. The Mammoth Hotel, as well as all of Fort Yellowstone, is built upon an old terrace formation known as Hotel Terrace. There was some concern when construction began in 1891 on the fort site that the hollow ground would not support the weight of the buildings. Several large sink holes (fenced off) can be seen out on the Parade Ground. This area has been thermally active for several thousand years.
Photography Now & Then Notes:
- Series Photos
- The Now photo is one that is almost always taken the day of the blog post. In some instances, posts may be backdated if internet access is not available on the day of the photo or other reasons prevent posting Photography Now and Then.
- The Then photo is usually a randomly selected older photograph from a batch of photos specifically “curated” for Photography Now and Then.
- Each photo in this series is an “original work” – a copyright term – of Michael Goad.
- Reference links were accessed on the date the blog post was published, unless otherwise stated.
- The title convention for Photography Now & Then blog posts evolved early on from one word related to each photo separated by “&” to usually being the first word in the caption description for each photo.
