Multivariate analyses of phenocryst compositions refine the Olduvai Bed I tephrostratigraphic framework.
Chemostratigraphic correlations enable source attribution of Bed I volcanic markers.
Proves switch from Ngorongoro to Olmoti source volcano
Emphasizes the importance of sediment recycling in tephrostratigraphic analysis
Improves correlation between western and eastern Olduvai Basin archeological sites