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The observation that certain fossils were associated with certain rock strata led early geologists to recognize a geological timescale in the 19th century.The development of radiometric dating techniques in the early 20th century allowed geologists to determine the numerical or "absolute" age of the various strata and thereby the included fossils.For example, based on the primate fossil record, scientists know that living primates evolved from fossil primates and that this evolutionary history took tens of millions of years.By comparing fossils of different primate species, scientists can examine how features changed and how primates evolved through time.A fossil is the preserved remains, impressions or traces, through natural circumstances, of an organism.Preserved bones, leaves, feces, eggs, shells, skin, footprints, etc. Scientists love them because they can figure out how living organisms used to be, date them with radiometric testing and stratigraphy, put them in museums, sell them to collectors, and other neat stuff. The method was developed by Willard Libby in the late 1940s and soon became a standard tool for archaeologists.Libby received the Nobel Prize for his work in 1960.

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Understanding the ages of related fossil species helps scientists piece together the evolutionary history of a group of organisms.Research has been ongoing since the 1960s to determine what the proportion of in the atmosphere has been over the past fifty thousand years.The resulting data, in the form of a calibration curve, is now used to convert a given measurement of radiocarbon in a sample into an estimate of the sample's calendar age.Fossil collecting is a hobby engaged in by many passionate, slightly crazed amateurs.Fossils are generally older than about 10,000 years, or longer ago than the end of the last Pleistocene glacial event.




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