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Probably 24" x 18 x 16. There is a Lake Superior Agate in it.alt text

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Any ideas on how this rock forms? Backyard find. Lower Michigan.

asked Jun 30, 2014 by Weasel (58,930 points)

2 Answers

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These usually form from waterworm or glacially eroded sediments that solidify in a mud matrix that hardens around them. Where do you see the agate in there? Can you take a zoomed in photo of it?

answered Jul 1, 2014 by hershel (52,780 points)
0 votes

The rock weighs 200 lbs. It is part of a rock garden I built. I pushed all the largest rocks into a circle and filled it with soil. I might dig it out. I was concerned someone would steal it, so you can only see a flat side from the road. The geologist said the reason it is here is the glaciers pushed it here from the Lake Superior region. That makes sense, agate and all.

answered Jul 1, 2014 by Weasel (58,930 points)

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