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Carbon 12 and 13 are stable isotopes and the amounts remain the same even in dead material.

Take students on a neighborhood walk and see what you can observe about age dates around you.Unlike people, you can’t really guess the age of a rock from looking at it.Yet, you’ve heard the news: Earth is 4.6 billion years old. That corn cob found in an ancient Native American fire pit is 1,000 years old. Geologic age dating—assigning an age to materials—is an entire discipline of its own. Metamorphosed quartz sandstone and chert are quartzites. Encompasses the time interval of 1.6 million years ago through today. The age of organic material determined by the amounts of carbon isotopes 12, 13 and 14. Hard, somewhat glassy-looking rock made up almost entirely of quartz.

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It’s based either on fossils which are recognized to represent a particular interval of time, or on radioactive decay of specific isotopes. Based on the Rule of Superposition, certain organisms clearly lived before others, during certain geologic times.

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