The Glacier national Park in the U.S. State of Montana, top top the border with Canada, is home to much more than 700 lakes, although only 131 of this lakes have names. About 200 lakes are over 5 acres in size, and a dozen of castle exceeds thousands of acres, which in unusual 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. It is not unexplained to see details top top the bottom that the lakes at depths of 30 feet or more.

One the the many striking feature of some of these lakes is the existence of a selection of colored rocks and also pebbles just listed below the water surface and on the shores. The rocks range in color from dark red come maroon, and also from eco-friendly to blue. Colored pebbles space seen in abundance on the shores the Lake McDonald top top the western side of the park. Lake McDonald is the largest of the lakes of Glacier national Park with a surface area of 6,823 acres. That is additionally the longest, at over 15 km, as well as the deepest lake in ~ 141 meters.


Photo credit: Jinrui Qu/Flickr

Quoting native the book “Glacier-Waterton international Peace Park” through Vicky Spring and Tom Kirkendall:

The shade of the rocks is determined by the existence or lack of iron. The bright red rocks discovered 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 clues or ancient mud cracked lines.

The affluent green-colored rocks were created in depths water 보다 the red rocks. Although these rocks contain the same quantities of iron-bearing minerals, they did not have actually the exact same exposure come oxygen and the quantity of oxidization to be limited.

The green rocks can be checked out at Otokomi Lake, if the dark-colored rocks found at the upper end of Lake McDonald, along McDonald Creek and also around Trout Lake space the result of subjecting the red and green iron-rich rocks to heat and pressure.

These rocks are actually all roughly Glacier national Park, and also were formed at various eras. As soon as the glaciers came, it damaged down the rocks right into tiny fragments and also the rivers washed them away.

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Many of these acquired deposited top top the lakes and "tarns" —lakes developed by pour it until it is full the bottom of ice-scoured amphitheaters. Water erosion climate rendered them right into smooth pebbles.