Paleoworld-101 Posted November 6, 2020 Share Posted November 6, 2020 After having another look at one of my bone fragments from the Bouldnor Formation (Isle of Wight, UK), the closest match i have been able to find is a bird acetabulum, as circled in the diagram below. But i am not an expert on avian anatomy. Can anyone else offer any insight? @Auspex Specimen is approx. 33 million years old. The Bouldnor Formation on the Isle of Wight produces a wide variety of mammals, turtles, crocodilians, birds, fish, lizards and amphibians. Measures 29 mm at its longest. The 'socket' which i think may be the acetabulum is 12.5mm in diameter. Link to post Share on other sites
butchndad Posted November 6, 2020 Share Posted November 6, 2020 That’s funny. Not more than five minutes ago I posted a photo of a piece of bone that looks so much like yours (but no hole) but from Cretaceous New Jersey Link to post Share on other sites
Rockwood Posted November 6, 2020 Share Posted November 6, 2020 A turtle bird ? But seriously, I have been thinking the texture seems a bit coarse for a bird myself. The shape fits the illustration given quite well though. A flightless bird would have a well developed pelvis, and unlike pterosaurs flighted birds needed them as a launch mechanism. 2 Link to post Share on other sites
Paleoworld-101 Posted November 9, 2020 Author Share Posted November 9, 2020 Hmmm can anyone suggest an expert on avian skeletal anatomy that would be suitable to show this specimen to? I am not too familiar with the world of bird academia, or who the 'key players' are in the field. Link to post Share on other sites
Rockwood Posted November 9, 2020 Share Posted November 9, 2020 @Troodon Suppose this is closer to an evolved theropod than the other choices on the menu ? Link to post Share on other sites
Troodon Posted November 9, 2020 Share Posted November 9, 2020 12 minutes ago, Rockwood said: @Troodon Suppose this is closer to an evolved theropod than the other choices on the menu ? No clue Link to post Share on other sites
Coco Posted November 9, 2020 Share Posted November 9, 2020 Hi, He doesn’t come around much anymore, but he’s still a bird specialist : @Auspex Coco 2 Link to post Share on other sites
Rockwood Posted November 9, 2020 Share Posted November 9, 2020 51 minutes ago, Troodon said: No clue For newcomers who might find this insignificant. Sometimes bone is just bone. It doesn't give up it's secrets easily. Link to post Share on other sites
Mahnmut Posted November 9, 2020 Share Posted November 9, 2020 Hi, Here a fellow member listed some candidates for Bouldnor birds on a family level: http://www.thefossilforum.com/index.php?/topic/84555-bouldnor-fm-bird-tarsometatarsus/ Given that the socket stands relatively isolated I could still imagine a mammal acetabulum. How about a small mammal like Cainotherium? Best Regards, J Link to post Share on other sites
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