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Message: <blockquote data-quote="dennishoddy" data-source="post: 3726202" data-attributes="member: 5412">Not smoke I don't think. We boated dozens of miles on Lake Powell two years ago with friends seeing thousands of those black streaks, all starting at the same layer in the strata of the rock that surrounds that lake. They are all the same color and appear to grow larger at the bottom than at the top which indicates it was not campfire as those would be larger at the top and smaller at the bottom as the smoke dispersed. I've been all over the internet trying to find out what caused those streaks, but have came up with zero.</blockquote>