While visiting Dinosaur National Monument in northeastern Utah, you are amazed by the numerous dinosaur bones exposed in the wall there. Among the hundreds of jumbled bones are some parts of dinosaur skeletons that are still articulated, such as the cervical vertebrae, parts of the appendicular skeleton, and skulls of sauropods. You are surprised by this display because you have heard about the "rarity" of dinosaur fossils, the incompleteness of the fossil record and how it casts doubt on evolutionary theory, and about how fossils are always preserved as scattered bits and pieces, rather than complete skeletons

How did such a concentration of bones end up in one place? How did parts of some animals stay articulated, and why are other parts scattered? Is the environment where the bones accumulated the same place as where the dinosaurs lived?

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