autographcollector11 Posted December 24, 2016 Share Posted December 24, 2016 Hi all OK, this is an interesting one. Attached are images of the Sandollar that was found on the California coast. It is broken, but I'm curious if it is fossilized.It is extremely hard, and feels like stone. I have many Sandollar's that are extremely fragile, however this one is heavy, lacks all the brittleness that one would find in a newer Sandollar. What are the signs to look for if fossilized? I took the best pictures that I could, hope they will work. thx Link to comment Share on other sites More sharing options...
Rockwood Posted December 24, 2016 Share Posted December 24, 2016 I'm not an expert on these, and I've never been to California, but I think you just described how to determine modern from fossil quite well. Link to comment Share on other sites More sharing options...
Al Dente Posted December 24, 2016 Share Posted December 24, 2016 It is Dendraster excentricus. The food grooves on your specimen are dark. Most of my modern specimens have dark food grooves which I think might be due to organic remains. That makes me think yours is modern. 2 Link to comment Share on other sites More sharing options...
RJB Posted December 24, 2016 Share Posted December 24, 2016 I have found hundreds of the fossilized Scuttelasters and a few of the Dendrasters in years past, and that one looks very modern to me. RB Link to comment Share on other sites More sharing options...
fifbrindacier Posted December 24, 2016 Share Posted December 24, 2016 I don't think it's fossilized, because if so, it wouldn't be empty. 2 "On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry) "We only well see with the heart, the essential is invisible for the eyes." In memory of Doren Link to comment Share on other sites More sharing options...
ynot Posted December 24, 2016 Share Posted December 24, 2016 I agree with a recent shell, does not look fossil to Me. 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...
Rockwood Posted December 24, 2016 Share Posted December 24, 2016 Just how heavy and how hard is it ? Wouldn't the answer outweigh what the appearance suggests ? Fossil sand dollars can be quite hollow. 1 Link to comment Share on other sites More sharing options...
Coco Posted December 24, 2016 Share Posted December 24, 2016 Hi, OK with Dendraster excentricus, and OK for recent specimen. Good observation Fifbrindacier ! Coco ---------------------- OUTIL POUR MESURER VOS FOSSILES : ici Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici Mâchoires sélaciennes récentes : ici Hétérodontiques et sélaciens : ici Oeufs sélaciens récents : ici Otolithes de poissons récents ! ici Un Greg... Link to comment Share on other sites More sharing options...
fifbrindacier Posted December 25, 2016 Share Posted December 25, 2016 On 24 décembre 2016 at 5:34 PM, Coco said: Hi, OK with Dendraster excentricus, and OK for recent specimen. Good observation Fifbrindacier ! Coco Merci beaucoup Madame. "On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry) "We only well see with the heart, the essential is invisible for the eyes." In memory of Doren Link to comment Share on other sites More sharing options...
Guguita2104 Posted December 26, 2016 Share Posted December 26, 2016 Yes, it looks modern, indeed.However, that's a really interesting specimen, that you can use to study fossil clypeasteroids' morphology. Regards, Link to comment Share on other sites More sharing options...
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