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This form will produce a list of sites which have tephra layers which match the geochemcial criterea you have searched on. It is then possible to get further details on which tephra layers are found at that particular site. From here it is then possible to retrieve geochemical data on any of the tephra layers displayed. Highlight the oxide you want to search on, selected how you wish to limit your search, type the value and then hit the search button.

which oxide:	wt % SiO2 wt % TiO2 wt % Al2O3 wt % FeO wt % MnO wt % MgO wt % CaO wt % Na2O wt % K2O
which qualifier:	between less than more than
type the values:	and

Data Sources

All of the data contained in this database is either published or donated. When using the data acknowledgement must be made of the original source of the data and that the data was obtained from Tephrabase. See Copyright information.