The sediment part from the bone is removed. Acid is used for preservation but in a very little amount as the bone is constructed of calcium carbonate and calcium phosphate. Ascetic acid and formic acid are commonly used for the purpose.
The dinosaur bone that I own is from the Mesozoic period. Dinosaur bones are very helpful as index fossils and there are some specific reasons behind this phenomenon. First of all, dinosaur bones can be traced very easily. Understanding the age to which they belong is not hard if someone deals with the index fossils.
Invertebrate Life: there were a few life forms existing during this period. Shells of silica and calcium carbonate are the two main forms. Class Sardonica was very important during this time. Marine invertebrates developed rapidly during the Mesozoic period.
Vertebrate Life: there were three distinguished sections in Mesozoic vertebrate life and they were: sauropod, theropod and ornithischian dinosaurs. Dinosaurs were among the best known creatures which dominated the world at that period.
Plant Life: this was the era when some of the major plants existed. Among them the mentionable ones are ginkoes, ferns and cycads. There were also some flowering plants present in the Mesozoic era too. Insect pollinating was one of these plants' characteristics.
Mesozoic was a period the dinosaurs are believed to have become extinct from the world.