Yellowstone National Park
Wyoming, Montana, Idaho
Mammoth Hot Springs

Minerva Terrace

"Minerva Spring is a favorite not only because of its wide range of bright colors but also for its ornate travertine formations. Since the 1890s, when records were first kept on the activity of Mammoth Hot Springs, Minerva has gone through both active and inactive periods. For several years in the early 1900s, it was completely dry, but by 1951 reports state that Minerva was again active.

During some cycles of activity, water discharge and mineral deposition have been so great that boardwalks have been buried beneath mounds of newly deposited travertine. Consequently, an elevated and movable boardwalk now spans the hill in the vicinity of Minerva. In recent years, hot spring activity has shifted dramatically from Minerva to other features on the Lower Terraces, and back again."    -NPS

Canary Spring

Named for its bright yellow color, Canary owes its brilliance to filamentous bacteria.  This bacteria dependent upon sulfur for it's survival.  The colors blend in delicate tints on the creamy rock face.

Orange Spring Mound

Bacteria and algae are the cause of the streaks of color on Orange Spring Mound. Its large mound-like shape is the result of extremely slow water flows and mineral deposits.

Jupiter Terrace

Jupiter Terrace demonstrates cycles of varying activity. In the 1980s Jupiter Terrace flowed so heavily that it overtook the boardwalks several times.  The spring has been dry since 1992.  When it is active, its color and intricate terraces make Jupiter an appealing spring.

Angel Terrace

"Known both for the pure white formations and colorful microorganisms of its active periods, Angel Terrace is one of the area's most unpredictable features. For decades it was dry and crumbling. More recently, hot springs have been intermittently active in parts of the formation."  -NPS

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More Photographs by Steve: Antelope Canyon|Monument Valley

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Revised: March 23, 2008.
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