It's not a coincidence at this point. Argentinosaurus, Patagotitan, now Bicharracosaurus, all from the same corner of southern Argentina, mostly discovered by farmers who happened to be walking across their own land. I teach Earth sciences and my first instinct was that it's just the geology, the right formations exposed by the right erosion patterns. But then I started reading more and I'm not sure that fully explains it. Is Patagonia actually richer in giant sauropod fossils, or does it just look that way because researchers have focused there? There's also the question of whether local farmers are more likely to find and report fossils than people in other regions with similar geology, which seems like something that would skew any dataset. I'd genuinely like to know what the distribution of late Cretaceous titanosaur fossil sites looks like worldwide, and whether Patagonia's concentration is real or partly an artifact of where paleontologists have been spending their time.
farmers keep finding them because they're absolutely massive. a bone sticking out of the ground the size of a car tends to get noticed.
I've heard that the Patagonian formations are genuinely exceptional for late Cretaceous preservation. The conditions that allow a 70-ton animal to fossilize rather than decompose aren't common. But I have no idea how that compares to equivalent formations in Africa or Asia. Is there actual density data comparing titanosaur sites globally, or is it more that Patagonia has been studied intensively and we just don't have comparable surveys elsewhere?
is this actually a concentration or just where the funding goes? feels like a classic sampling bias question. you find more where you look more.
honestly that's exactly what I can't figure out. whether the concentration is real or a research artifact. it's why I posted this. the geology argument felt convincing until I started wondering how many equivalent formations in other countries just haven't been systematically surveyed.
what I keep getting stuck on is whether titanosaurs specifically preferred certain climate bands during the late Cretaceous, and whether Patagonia happened to sit in those bands. because that would actually be a real ecological explanation rather than just a geology and erosion story. I have no idea if that's been studied but it seems like the kind of thing that changes what you'd be looking for in other regions.