Optical dating techniques dating a new york woman
Note: Many of our articles have direct quotes from sources you can cite, within the Wikipedia article! It is useful to geologists and archaeologists who want to know when such an event occurred.
Optical dating is a method of determining how long ago minerals were last exposed to daylight.
Ages can be obtained outside this range, but they should be regarded with caution.
The accuracy obtainable under optimum circumstances is about 5%.
The calcium-potassium age method is seldom used, however, because of the great abundance of nonradiogenic calcium in minerals or rocks, which masks the presence of radiogenic calcium.
On the other hand, the abundance of argon in the Earth is relatively small because of its escape to the atmosphere during processes associated with volcanism.