Thin, brownish layers of a thickness of about a millimeter or two are sometimes observed in the whitish/transparent ice cores. These brown layers consist of material originating from volcanic eruptions.
One of the most distinct ash layers in the Greenland ice cores is seen to the right of this 55 cm long piece of an ice core.
It is the 55,500 year old ash layer Z2, which is believed to originate from an enormous eruption in Iceland….
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