The Glacier national Park in the U.S. State of Montana, ~ above the border v Canada, is house to an ext than 700 lakes, although only 131 of this lakes have actually names. Around 200 lakes space over 5 acres in size, and also a dozen of lock exceeds thousands of acres, which in unexplained for hill lakes. Additionally, the waters the the lakes space remarkably clear. This is owning come the year long low temperatures that prohibit the growth of planktons. That is not unusual to check out details ~ above the bottom that the lakes at depth of 30 feet or more.

One of the most striking attribute of few of these lakes is the presence of a selection of colored rocks and pebbles just below the water surface and also on the shores. The rocks selection in shade from dark red to maroon, and from green to blue. Colored pebbles are seen in diversity on the shores the Lake McDonald ~ above the western next of the park. Lake McDonald is the largest of the lakes of Glacier nationwide Park through a surface ar area of 6,823 acres. It is also the longest, at over 15 km, and the deepest lake at 141 meters.

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Photo credit: Jinrui Qu/Flickr

Quoting native the publication “Glacier-Waterton worldwide Peace Park” by Vicky Spring and Tom Kirkendall:

The shade of the rocks is identified by the visibility or lack of iron. The bright red rocks uncovered along the Grinnel Glacier trail were deposited in a shallow ocean setting where the iron to be oxidized through the tidal exposure come the air. Rocks with this coloration frequently have old ripple marks or ancient mud crack lines.

The well-off green-colored rocks were developed in depth water than the red rocks. Although this rocks save on computer the same amounts of iron-bearing minerals, they did not have actually the same exposure to oxygen and the lot of oxidization to be limited.

The green rocks can be checked out at Otokomi Lake, while the dark-colored rocks discovered at the upper finish of Lake McDonald, follow me McDonald Creek and also around Trout Lake room the an outcome of subjecting the red and green iron-rich rocks to heat and also pressure.

These rocks space actually all roughly Glacier national Park, and were formed at various eras. Once the glaciers came, it broke down the rocks into tiny fragments and the rivers washed castle away.


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Numerous of these gained deposited top top the lakes and also "tarns" —lakes formed by pour it until it is full the bottom of ice-scoured amphitheaters. Water erosion climate rendered them into smooth pebbles.