R: Tephra layer

tephra {sm} | R Documentation

## Tephra layer

### Description

These data record the percentages of aluminium oxide found in samples from a tephra layer resulting from a volcanic eruption in Iceland around 3500 years ago.

The variables are:

`Al2O3` | percentage of aluminium oxide

The data were collected by A.Dugmore. The geological background to the data is given by Dugmore et al (1992), Geochemical stability of finegrained silicic tephra in Iceland and Scotland, J.Quatern.Sci. 7, 173-83.

[Package sm version 2.2-5.4 Index]