abyssunder Posted January 14, 2018 Share Posted January 14, 2018 They are rudist fragments. 3 " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
GallinaPinta Posted January 14, 2018 Author Share Posted January 14, 2018 11 hours ago, Troodon said: Where was it found That page didn't want to load for me so thanks for uploading that image I circled the area and added a blue dot where the location of the river is most likely at. Link to comment Share on other sites More sharing options...
GallinaPinta Posted January 14, 2018 Author Share Posted January 14, 2018 7 hours ago, abyssunder said: They are rudist fragments. Wow. That's amazing, I'm gonna download that pic. Thank you! Link to comment Share on other sites More sharing options...
GallinaPinta Posted January 14, 2018 Author Share Posted January 14, 2018 7 hours ago, Rockwood said: Just curious. Why the urgency ? I'm a newbie so I was really, really curious I was going nuts to know the kind of fossil I found so close to my home. Link to comment Share on other sites More sharing options...
FranzBernhard Posted January 15, 2018 Share Posted January 15, 2018 23 hours ago, GallinaPinta said: This one does indeed look like a rudist! But I am still not convinced by the other ones. Her location seems to be in Caenozoicic strata, but that does not mean very much (transported boulders?) Maybe this paper could help: https://pubs.usgs.gov/bul/1274g/report.pdf The Aguada limestone of Northwestern Puerto Rico "In northwestern Puerto Rico, the upper 85 m contains many thick lenses or beds of very pale orange to bright- yellow, slightly ferruginous chalk containing many beds of large oysters (Ostrea haitensis Gabb) and other fossils." Franz Bernhard Link to comment Share on other sites More sharing options...
FranzBernhard Posted January 15, 2018 Share Posted January 15, 2018 Btw, here is an example of a fragment of two intergrown lower/left valves of Crassostrea gryphoides from the miocene of Austria, just for comparision. A small oyster is sitting between the two large fragments. Hight of specimen ca. 15 cm, left inside, right outside of the same specimen. Franz Bernhard 4 Link to comment Share on other sites More sharing options...
Rockwood Posted January 15, 2018 Share Posted January 15, 2018 8 hours ago, GallinaPinta said: I'm a newbie so I was really, really curious I was going nuts to know the kind of fossil I found so close to my home. Hope you have plenty of shelves and draws. This is how it starts you know. 3 Link to comment Share on other sites More sharing options...
Al Dente Posted January 15, 2018 Share Posted January 15, 2018 I see at least two oyster hinges. Here is a similar one from the Oligocene of North Carolina. 4 Link to comment Share on other sites More sharing options...
abyssunder Posted January 15, 2018 Share Posted January 15, 2018 Franz, Eric, you might be right. If the geological time is in Cenozoic they can't be rudists. These kind of bivalves (oysters, rudists) sometimes can be very tricky. 1 " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
FranzBernhard Posted January 15, 2018 Share Posted January 15, 2018 Sure, and they are also closely related. But what really is the "thing" with the hole in the middle?? Hoping for more photographs from GallinaPinta... Franz Bernhard 1 Link to comment Share on other sites More sharing options...
fifbrindacier Posted January 15, 2018 Share Posted January 15, 2018 I also, hesitate between rudist or oyster. Here is a crassostrea longirostra from the Serravallian and an imprint of Ichthyosarcolites from the cenomanian. "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...
Rockwood Posted January 15, 2018 Share Posted January 15, 2018 2 hours ago, FranzBernhard said: Sure, and they are also closely related. But what really is the "thing" with the hole in the middle?? Hoping for more photographs from GallinaPinta... Franz Bernhard The holes look like the work of yet another bivalve, loosely referred to as boring clams. Link to comment Share on other sites More sharing options...
Bobby Rico Posted January 15, 2018 Share Posted January 15, 2018 11 minutes ago, Rockwood said: The holes look like the work of yet another bivalve, loosely referred to as boring clams. In the UK we call this type of bivalves Piddocks. nice find btw Link to comment Share on other sites More sharing options...
Rockwood Posted January 15, 2018 Share Posted January 15, 2018 2 minutes ago, Bobby Rico said: In the UK we call this type of bivalves Piddocks. nice find btw I suspect they've been called worse. Shipworms being the subject. 1 Link to comment Share on other sites More sharing options...
abyssunder Posted January 16, 2018 Share Posted January 16, 2018 I think, the best match for this one might be a lower valve of Ostrea cahobasensis Pilsbry and Brown , variety portoricana n. var.; new name - Striostrea cahobasensis . 3 " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
Boesse Posted January 20, 2018 Share Posted January 20, 2018 @Al Dente beat me to it - it falls within the range of variation of giant oysters like Crassostrea. 1 Link to comment Share on other sites More sharing options...
abyssunder Posted January 20, 2018 Share Posted January 20, 2018 The sediments from the mentioned region of Puerto Rico are too young for for rudists. I can see similar holes like in the specimens in question in the comparative picture below, so it makes sense. 1 " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
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