New Members Maevek Posted August 1 New Members Share Posted August 1 Hi, not sure if this is a fossil but I can’t seem to find any details online. The swirl pattern definitely looks similar to some fossils I’ve seen before, but I can’t quite pin down what it is. Photographed the front and back next to a penny for size reference! Found it when looking for rocks along the shore of Lake Michigan. Link to comment Share on other sites More sharing options...
Fossildude19 Posted August 1 Share Posted August 1 This looks like a water worn/polished steinkern (internal cast) of a gastropod fossil. Cropped and brightened: 2 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 IPFOTM -- MAY - 2024 _________________________________________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
New Members Maevek Posted August 1 Author New Members Share Posted August 1 Excellent, thank you. I’m assuming these are pretty common finds in the Great Lakes? Link to comment Share on other sites More sharing options...
Fossildude19 Posted August 1 Share Posted August 1 I would think so. Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 IPFOTM -- MAY - 2024 _________________________________________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
Coco Posted August 2 Share Posted August 2 Hi, It makes me think of a gasteropod operculum : LINK Coco ---------------------- OUTIL POUR MESURER VOS FOSSILES : ici Pareidolia : here 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...
Fossildude19 Posted August 2 Share Posted August 2 3 hours ago, Coco said: Hi, It makes me think of a gasteropod operculum : LINK Coco I respectfully disagree. I had considered this, but discarded the idea, due to the matrix that makes up the piece. One can clearly see other inclusions, which, if this were a solid operculum, it would not have. This makes me believe it is a very water worn steinkern of a gastropod, not an operculum. 1 1 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 IPFOTM -- MAY - 2024 _________________________________________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
Coco Posted August 2 Share Posted August 2 It is true that generally the operculum of gastropods have relatively solid colors. In the original specimen we can see forms but I don’t know what it is. You are probably right (I think I was wrong in the same way not long ago... ). Coco ---------------------- OUTIL POUR MESURER VOS FOSSILES : ici Pareidolia : here 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...
Shellseeker Posted August 2 Share Posted August 2 I have found exactly 1 operculum more than 10 years ago.. described in this thread... https://www.thefossilforum.com/topic/37602-smr-aggregates/page/2/ It does not "seem to be fossilized" but it was recovered from a pit at least 100 feet below (dated 2-3 mya} current land surface. I enjoyed re_reading the thread. The White Queen ".... in her youth she could believe "six impossible things before breakfast" Link to comment Share on other sites More sharing options...
Coco Posted August 2 Share Posted August 2 Yes Jack, I was happy to read it again. Thank you for bringing that up. Coco ---------------------- OUTIL POUR MESURER VOS FOSSILES : ici Pareidolia : here 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...
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