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acid adult animals baby bones baby dinosaurs Bear Paw shale big bone bed birds Bob Makela bone bed caliche called camp Camposaur carnivores ceratopsians Choteau collection creatures crew deposits digging dinosaur bones dinosaur eggs dinosaur fossils dirt discoveries duckbills egg clutches Egg Mountain eggshell fragments embryos endotherms evidence femur fossil bones fossils geological green mudstone hadrosaurs hatched herbivores herd hill hypsilophodontids ice pick Jill Peterson Judith River formation juvenile dinosaurs kind of dinosaur lake lambeosaurs land layers lizards maiasaurs mammals Marion Brandvold Medicine formation metabolism miles million years ago Montana mudstone Museum nose ornithischians Orodromeus paleontologists Paris Peebles ranch perhaps Phil Currie preserved Princeton reptiles Ricqles rock Rockies saurischian sauropods season sediments shale skeletons skull species spot streams summer surface teepees teeth temperature thing Troodon upper coastal plain walking warmblooded Willow Creek anticline young dinosaurs