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jeromp

large stone circular marks 10 mm diameter

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jeromp

Hi,

image.thumb.jpeg.8675cc299dd7bfba08e6d97d43b30c0b.jpegI found this large stone today in a local field in the West Midlands, what would the circular marks be caused by ?

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ynot

I agree with percussion marks in a stream tumbled cryptocrystalline quartz rock.

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jeromp

Thankyou for the replies

How long ago would this have happened?

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ynot
1 minute ago, jeromp said:

Thankyou for the replies

How long ago would this have happened?

Anywhere between last week and 500 million years ago.:D

 

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jeromp

Wow thanks, this could be my oldest find yet !

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