Radiocarbon dating is the primary technique for dating
Here's an analogy: Imagine you have a gallon of water to which you add one ounce of blue dye.
And say that every 5,568 years you add another gallon of water to the mixture.
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like a giant map or blueprint left by ancient astronauts, lie the famous Nazca Lines of Peru.
The concentration of blue dye is cut in half again.
Now imagine repeating this process for quite some time.
The desolate plain of the Peruvian coast which comprises the Pampas of San Jose (Jumana), Socos, El Ingenio and others in the province of Nasca, is 400 Km.
These factors, combined with the existence of a lighter-coloured subsoil beneath the desert crust, provide a vast writing pad that is ideally suited to the artist who wants to leave his mark for eternity.
The pebbles which cover the surface of the desert contain ferrous oxide.
Also represented are drawings of man-made objects such as yarn, looms and "tupus" (ornamental clasps). -- Quetzalcoatl who is Zoroaster The Lines were allegedly made by removing the iron-oxide coated pebbles which cover the surface of the desert.
All these figures have well-defined entrances which could be used as paths or to allow people to line together along the conformations of the drawings. The Monkey has a Spiraling Tail -- The Evolution of Humanity and Consciousness? When the gravel is removed, they contrast with the light color underneath.
There's carbon-13, or 13 C, which is much rarer, accounting for only 1.11 percent, and then there's carbon-14, or 14 C, which makes up a ridiculously tiny fraction of existing carbon. Living organic matter will have steady and predictable concentrations of each isotope of carbon, pretty much the percentages mentioned above. After something dies, the 14 C decays over time (because it is radioactive) and doesn't replenish as it would in a live specimen because the dead thing isn't eating and breathing or otherwise exchanging molecules with the outside world anymore).