Until the 1800s, a fossil meant anything dug from the ground, gems included
Before the 19th century a fossil could be a bone, a pebble or a gemstone; the word simply meant something dug up. Many scholars thought fossils grew inside rock the way crystals do. Georges Cuvier's work in 1796 finally showed that some belonged to creatures that no longer walked the Earth.
Paleontology studies past life, chiefly through fossils, and uses them to classify organisms, date rocks and reconstruct ancient environments. Observations go back to at least the 6th century BC, but the science is usually dated to Cuvier, who demonstrated that species can go extinct and that past life differed from the present. The French word paléontologie appeared in 1822, built from Greek roots for ancient, being and study. North Americans write paleontology, while British usage keeps palaeontology.
Making sense of fossils took centuries. Sixteenth-century books illustrated them alongside minerals, some crediting them to divine design and others suggesting uses in building or medicine. From the 17th century some argued they were once alive, but that was awkward: many resembled no living creature, implying extinction in what was thought a perfect creation, and sea shells turned up high on mountains. Early geologists often explained rock layers as sediment from the Biblical Flood. Cuvier and his peers held that Earth was neither freshly made nor eternal, but had a long prehuman past readable in the rocks.
The fossil record is patchy by nature. Most fossils are hard parts like bone, wood or shell replaced by minerals, sometimes ending up denser than in life. Soft tissues occasionally leave impressions, and rarely a whole animal is buried before it rots. Trace fossils record behaviour instead of bodies: burrows, footprints and fossil dung. Seafloors preserve remains better than land, and rivers and lakes better than mountains or deserts, while older rocks hold less information overall, which is one reason life's earliest chapters remain murky.
The field draws huge public attention, rivalling astrophysics in media coverage. People once read giant bones as the remains of dragons or giants, and today dinosaur toys, films, games and tourism often command budgets larger than the research funding for paleontology itself.
Source: Paleontology
