New Members eD00Mn Posted January 12 New Members Share Posted January 12 Found this on Onslow Beach, in North Carolina, washed up during low tide. It seems to have the weight and texture of a stone. On the flat side there’s a convex ball shaped protrusion right by the notch (it protrudes about 2mm from flat surface to peak of protrusion). I apologize for the standard system being used in the photo. I did measure the length of it in cm and it was exactly 4.5 cm across. Also I am not certain if this is even a fossil as I know very little about the subject. But what caught my eye was all the symmetry involved. Any input is appreciated 🤝. 1 Link to comment Share on other sites More sharing options...
Harry Pristis Posted January 12 Share Posted January 12 It is a steinkern, the internal cast of a bivalve. 1 1 5 http://pristis.wix.com/the-demijohn-page What seest thou else In the dark backward and abysm of time? ---Shakespeare, The Tempest Link to comment Share on other sites More sharing options...
New Members eD00Mn Posted January 12 Author New Members Share Posted January 12 Sweet, good to know, thanks! Link to comment Share on other sites More sharing options...
Shellseeker Posted January 12 Share Posted January 12 9 hours ago, eD00Mn said: Found this on Onslow Beach, in North Carolina, washed up during low tide. It seems to have the weight and texture of a stone. On the flat side there’s a convex ball shaped protrusion right by the notch (it protrudes about 2mm from flat surface to peak of protrusion). I apologize for the standard system being used in the photo. I did measure the length of it in cm and it was exactly 4.5 cm across. Also I am not certain if this is even a fossil as I know very little about the subject. But what caught my eye was all the symmetry involved. Any input is appreciated 🤝. Welcome to the forum!!! You have a talent for framing photos. I hope you find other fossils that encourages more photos on TFF. 1 1 The White Queen ".... in her youth she could believe "six impossible things before breakfast" Link to comment Share on other sites More sharing options...
New Members eD00Mn Posted January 12 Author New Members Share Posted January 12 Is there any estimate for age of this fossil? Link to comment Share on other sites More sharing options...
SPrice Posted January 12 Share Posted January 12 Yes, and with a geological map as one resource to assist you. Something like this image. But of better quality ...this is just a screenshot. Google is your friend. 1 1 Link to comment Share on other sites More sharing options...
Plantguy Posted January 14 Share Posted January 14 On 1/11/2024 at 10:45 PM, Harry Pristis said: It is a steinkern, the internal cast of a bivalve. Hey Harry and you all, I think I see bony elongated cell structure when I zoom in real close in some areas. I dont think I see sand/mineral grains as I'd expect for a steinkern so I'm gonna propose that its actually a larger till bone thats pretty worn in spots. I've got some larger tillys that have a flatter base and that general form and do also have some irregular lobes...I know when you zoom it sometimes skews the pixels but let me know what you think. Maybe eDoomn can confirm by looking at under magnification. Very cool find one way or the other. Good pics! Regards, Chris Regards, Chris 2 Link to comment Share on other sites More sharing options...
sixgill pete Posted January 14 Share Posted January 14 (edited) My first thought was well worn sea robin skull and at 4.5 cm (1.7 inches) it could be. Onslow beach is well known for its Oligocene aged fossils but also produces Pliocene / Pleistocene aged goodies. Edited January 14 by sixgill pete 3 Bulldozers and dirt Bulldozers and dirt behind the trailer, my desert Them red clay piles are heaven on earth I get my rocks off, bulldozers and dirt Patterson Hood; Drive-By Truckers May 2016 May 2012 Aug 2013, May 2016, Apr 2020 Oct 2022 Link to comment Share on other sites More sharing options...
Plantguy Posted January 14 Share Posted January 14 1 hour ago, sixgill pete said: My first thought was well worn sea robin skull and at 4.5 cm (1.7 inches) it could be. Onslow beach is well known for it's Pligocene aged fossils but also produces Pliocene / Pleistocene aged goodies. If it is indeed boney Yep I could see another element like the skull, something with some symmetry. Here's a god awful group picture of some of the larger tillys I have. Regards, Chris 1 1 Link to comment Share on other sites More sharing options...
Harry Pristis Posted January 14 Share Posted January 14 Still looks like a steinkern from an Arca sp. 15 hours ago, Plantguy said: sand/mineral grains as I'd expect for a steinkern The steinkerns I've encountered are made of very fine grains that have managed to infiltrate the closed valves. It's these fine grains that cohere into a stoney cast. Tilly bones are, OTOH, very hard fish bone without discernible grains. 1 http://pristis.wix.com/the-demijohn-page What seest thou else In the dark backward and abysm of time? ---Shakespeare, The Tempest Link to comment Share on other sites More sharing options...
sixgill pete Posted January 14 Share Posted January 14 2 hours ago, Harry Pristis said: Still looks like a steinkern from an Arca sp. The steinkerns I've encountered are made of very fine grains that have managed to infiltrate the closed valves. It's these fine grains that cohere into a stoney cast. Tilly bones are, OTOH, very hard fish bone without discernible grains. I can see this as being an Arca sp. steinkern also. Size and shape is right, And would be present in the formations that produce on this beach. 1 1 Bulldozers and dirt Bulldozers and dirt behind the trailer, my desert Them red clay piles are heaven on earth I get my rocks off, bulldozers and dirt Patterson Hood; Drive-By Truckers May 2016 May 2012 Aug 2013, May 2016, Apr 2020 Oct 2022 Link to comment Share on other sites More sharing options...
Plantguy Posted January 14 Share Posted January 14 2 hours ago, Harry Pristis said: Still looks like a steinkern from an Arca sp. The steinkerns I've encountered are made of very fine grains that have managed to infiltrate the closed valves. It's these fine grains that cohere into a stoney cast. Tilly bones are, OTOH, very hard fish bone without discernible grains. Hi Harry, Yep some I have are composed of fine clay/mudstone/siltstone, others have fine grained sands/coarser grained composition. I can see it being something like an Arca I just want to confirm what the composition/texture within is. If I'm all wet and its not boney its relatively easy to prove by looking at those fractured/worn areas. The tillys which get beat up commonly show a boney interior texture, but many of the others without the abrasions show no external cellular signs. Regards, Chris 1 Link to comment Share on other sites More sharing options...
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