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Hi! While looking around the steps outside Bilbao's Guggenheim Museum, I came across this which looks a lot like the cross section of a bone?? Unfortunately I have no information as to where this rock was quarried, so I don't know how old it is... I'm attaching another photo to show the other kind of fossils that can be seen on the steps. I assumed they were some kind of marine creatures (rudists maybe, which I'm used to seeing in other parts of the city, in a different type of rock), which is why a bone seems a bit crazy. It would be nice to know what you guys make of
What could this be? Just a rock or a fossil as i have theorized. My guess is that it could be a kind of marine fossilized arthropod, with fossilized inner organs, i know it is not very common but thats what makes more.sense to me. . It was found in the rivershore in Bilbao, in lower cretaceous sediments, i found some sea-urchin fossils there too. . Thanks a lot!