jeromp Posted April 26, 2019 Share Posted April 26, 2019 Hi, I found this large stone today in a local field in the West Midlands, what would the circular marks be caused by ? Link to comment Share on other sites More sharing options...
DPS Ammonite Posted April 26, 2019 Share Posted April 26, 2019 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 4 My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
ynot Posted April 26, 2019 Share Posted April 26, 2019 I agree with percussion marks in a stream tumbled cryptocrystalline quartz rock. 1 Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
jeromp Posted April 26, 2019 Author Share Posted April 26, 2019 Thankyou for the replies How long ago would this have happened? Link to comment Share on other sites More sharing options...
ynot Posted April 26, 2019 Share Posted April 26, 2019 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. 3 Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
jeromp Posted April 26, 2019 Author Share Posted April 26, 2019 Wow thanks, this could be my oldest find yet ! Link to comment Share on other sites More sharing options...
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