Because the cosmic ray bombardment is fairly constant, there’s a near-constant level of carbon-14 to carbon-12 ratio in Earth’s atmosphere.
Organisms at the base of the food chain that photosynthesize – for example, plants and algae – use the carbon in Earth’s atmosphere.
These remains include the fossils (preserved bones) of humans, food remains, the ruins of buildings, and human artifactsitems such as tools, pottery, and jewelry.
They can help to identify your specimen and to learn something about their properties, but they don't get you anywhere beyond that. Silica Minerals John Wiley, New York and London, 1962 Jaroslav Hyrsl, Gerhard Niedermayr Magic World: Inclusions in Quartz / Geheimnisvolle Welt: Einschlüsse im Quarz Bode Verlag Gmb H, Haltern, 2003 ISBN 3-925094-81-4 L.