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This form will produce a list of tephra layers for which there are analyses which fall within the constraints that you set. From here it is then possible to retrieve geochemical data on any of the tephra layers displayed showing all data from all the sites where that tephra is found. Highlight the oxide you want to search on, selected how you wish to limit your search, type the value and then hit the Submit Query 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.