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large stone circular marks 10 mm diameter


jeromp

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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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Those are percussion marks. The silicious rock hits other rocks creating conchoidal fractures.

 

See this post: 

 

http://www.thefossilforum.com/index.php?/topic/93956-nj-cretaceous-stream-oddity/&tab=comments#comment-1035918

 

193D22E7-FD0D-4161-A19C-B0C646B0DB41.jpeg

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My goal is to leave no stone or fossil unturned.   

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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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Darwin said: " Man sprang from monkeys."

Will Rogers said: " Some of them didn't spring far enough."

 

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