<p>A section of sandstone cliffs along Lake Superior. Trees grow on top of the cliffs.The name "Pictured Rocks" comes from the streaks of mineral stain that decorate the cliffs. Stunning colors occur when groundwater oozes out of cracks and trickles down the rock face. Iron (red and orange), copper (blue and green), manganese (brown and black), and limonite (white) are among the most common color-producing minerals.</p>
<p>Sandstone Cliffs of Pictured Rocks NL</p>
<ul><li>Keywords: Pictured Rocks National Lakeshore; piro; pictured rocks; sandstone; lake superior; color; minerals; cliffs; erosion</li></ul>
NPS
Taken on 23 September 2009
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