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carbon-14
precambrian
Uranium dating is useful for long periods of time - e.g. 109 years. For fossils is recommended the method with 12C.
Index fossils
Old
Carbon 14 dating is most useful for dating fossils that are up to 50,000 years old. Beyond this time frame, the amount of C-14 left in the fossil is too minimal to provide accurate dating results.
Carbon-14 is in all living things and decays after it dies. It has a long half life (the time it takes for half a sample to decay into another element) and gives a good estimate as to how old something is. Carbon dating is only effective up to an approximate age of 70,000 years, and is only useful in dating organic matter. Since the vast majority of fossils are much older than this, carbon dating is not particularly useful in dating fossils, but is of great use in archaeology.
So you can find out how old your mom is. Roast!!!
carbon-14
It is not useful in dating rocks. Only organic substances in terrestrial conditions. No carbon in rocks.
Metal artifacts rarely contain residues of organic products. Carbon-14 dating is adequate only for artifacts containing organic materials.
Radiocarbon dating is not typically used to determine the age of the Earth because it can only accurately date organic materials up to around 50,000 years old. Other dating methods, such as radiometric dating of rocks and minerals, are used to estimate the age of the Earth, around 4.5 billion years.
In what ways are fossils useful to geologist?
precambrian
carbon- 14
Carbon-14 is the isotope commonly used for dating wood and charcoal less than about 75,000 years old. This isotope is useful because plants take in carbon-14 while they are alive, and it decays at a known rate after the plant dies, allowing for accurate dating.