Beds of volcanic materials are attracting the attention of geologists, who are using them as key horizons in stratigraphic correlation. This is shown by the increasing number of papers on the subject that are published, especially within the last few years.
Explosive eruptions often spread volcanic debris over very large areas, and the volume of material ejected may reach stupendous proportions. If the ash is deposited directly from the air, the resulting bed will be continuous and may present the same characteristics even when other closely associated beds are entirely dissimilar. The ash may fall on land and later be...
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