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For example, a widespread tephra erupted from the Tūhua caldera (Mayor Island) about 7,000 years ago contains very unusual minerals.

This tephra can be identified instantly with a microscope, even from just a few grains.

These sedimentary records, together with historical records of Holocene ash falls, demonstrate that Icelandic volcanoes have generated substantial ash clouds that reached northern Europe many times.

Here we present the first comprehensive compilation of sedimentary and historical records of ash-fall events in northern Europe, spanning the past 7000 yr.

In the laboratory, the types of mineral grains (crystals) sometimes allow the tephra to be identified and matched to a source volcano.These tuffs generally are thought to be the result of single or related airfall events that likely deposited a rather thin layer of volcanic dust across a wide area.In turn this volcanic dust was transported by wind and rain into streams and redeposited in local basins, commonly lakes, as thick tuffs.Tuffs have been discovered in Emmons, Sioux, Stark, Dunn, Slope, and Mc Kenzie counties. The most well known tuff deposit is the Linton Ash which has been actively promoted for a period of twenty years but has undergone little development. E., 1962, Investigation of pozzolanic properties of the Cretaceous volcanic ash deposit near Linton, North Dakota: North Dakota Geological Survey Report of Investigation No.

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