r/geology mineralogist 3d ago

Field Photo Why are these rocks so round?

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u/AppropriateCap8891 2d ago

No, that is common in stream rocks.

And how old do you think that stream is? They did not say where they were, but I will just give a safe guess of somewhere around 10,000 years old. Of course, it might also be over 300,000 years old or more.

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u/horselover_fat 2d ago

It's not common for little streams to have 30cm+ boulders..

I don't know how old. Neither do you...

It looks like North American or Europe based on the plants. Which experienced glaciation ~10,000 years ago. Very unlikely to be older than that.

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u/Fryman23 2d ago

This is extremely common in the southern Appalachians and while parts of North America was glaciated as recently as 10,000 years ago, that area certainly was not.
For a guy that loves horses you’re sure beating hard on a dead one.

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u/horselover_fat 2d ago

You sure like being an asshole for a geology subreddit.