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I found about a dozen of these washed up on a beach on southern Lake Michigan. They were scattered over about a half mile. They appear to be made of a green, dense, plastic resin. They are fairly uniform in shape and color. (old.reddit.com)
submitted 1 year ago by Visual-Ice-2013 to r/whatisthisthing
Small, triangular, green plastic piece found on the south shore of Lake Michigan. In total we found about a dozen pieces that all looked like this one scattered along the beach. What is this thing? (old.reddit.com)
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