Dating glacier layers
Radioactive elements, either of natural origin or created by nuclear testing, can be used to date the layers of ice in the cores.
Some volcanic events which were sufficiently powerful to have distributed material around the globe leave a signature in the ice which can be detected in many different cores, allowing synchronization of the time scales between two different locations.
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I saw these layers first hand inside some ice caves in the cap.
Impurities in ice cores may depend on location; for example, coastal areas are more likely to include material of marine origin, such as sea salt ions.
Greenland ice cores contain layers of wind-blown dust that correlate with cold, dry periods in the past, when cold deserts were scoured by wind.
Seasonal signals and “dating horizons” allow for accurate dating of ice cores.
that is marked by colder temperatures and glacier ...