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Photographer's Note

Under the Blue Glacial water these logs lie submerged along the shoreline. This is clearly seen at Joffre Lakes. The blue water tones come from rock flour or glacial flour. It consists of clay-sized particles of rock, generated by glacial erosion or by artificial grinding to a similar size. Because the material is very small, it is suspended in river water making the water appear cloudy. If the river flows into a glacial lake, the lake may appear turqoise in color as a result. Here is a view looking across the lake.
Natural rock flour is typically formed during glacial migration, where the glacier grinds against rock beneath it, but is also produced by freeze thaw, where the act of water freezing and expanding in cracks helps break up rock formations.
Although clay-sized, its particles are not clay minerals but typically ground up quartz and feldspar. Rock flour is carried out from the system via meltwater streams, where the particles travel in suspension.

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Additional Photos by Paul Enns (PJE) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2045 W: 133 N: 4148] (20758)
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