Dinosaur Eggs From China Found to Be Around 86m Years Old
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Dinosaur Eggs
Paleontology
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Dinosaur eggs found in China dated to be around 86 million years old, sparking interest in paleontology.
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Basically when a rock solidifies from lava or a lifeform dies they cease to exchange materials with their environment and the concentration of unstable isotopes will decay and deviate from that of the environment. The difference can be used to date how long the exchange has stopped.