About Dinosaur Bone: Dinosaur Bone: Dinosaur bones are fossilized remains of animals that lived on Earth many years ago. Dinosaur bone is made up of a hard outer layer and a spongy inner layer. Dinosaur bone forms by the process of permineralization, which happens when organic matter becomes buried in sedimentary rock and undergoes chemical change over time. The hard outer layer of the bone is replaced by minerals such as quartz, calcite, and hematite. Dinosaur bones can be found all over the world, and they are often used to study paleontology and geology.