Dinosaur bones are most likely to be found in clastic sediments. If formed in the oceans, they typically contain remains of invertebrates. Biogenic material, specifically, organic carbon compounds, are the second largest reservoir of carbon in the Earth system after limestone. The three principal properties used in identifying sedimentary rocks are texture, composition and fabric . The texture refers to particle sizes and shapes, and is related both to the condition which prevailed when the sediment was deposited and to the source of the sediment.
Composition refers to the mineralogy of the particles making up the rock, and of the cement.
It is determined by the composition of the sediment source of the sediments, and can be altered by the physical conditions at the site of deposition, as well as during transport. Sedimentary rock fabric, which tells us the most about the environment at the time of deposition, includes such things as the style of layering, burrows, ripple marks and mudcracks. Dinosaur bones are only likely to be found in the clastic rocks so be sure you can distinguish these from the other sediments. Igneous rocks are classified on both their grainsize and chemical composition. Extrusives include lava, pumice, and ash from volcanoes.