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Phytoliths are opal silica particles formed within plant tis- sues. Diatoms are aquatic, single-celled photosynthetic algae with silica skeletons. Phytolith and diatom morphotypes vary depending on local environmental and climatic conditions and because their silicate structures preserve well, the study of phytolith and diatom morphotypes can be used to better understand paleoclimatic and paleoenvironmental dynam- ics and changes. This article presents original data from an 820cm-deep stratigraphy excavated at the Hazen diatomite deposits, a high-elevation desert paleolake in the Fernley Dis- trict, Northern Nevada, USA. The site has been studied for an assemblage of fossilized threespine stickleback, Gasterosteus doryssus , that reveal adaptive evolution. For this study, a to- tal of 157 samples were extracted at 20 cm intervals cover- ing approximately 24,500 years. After extraction, the samples were mounted on slides and viewed under 40 0-10 0 0x light microscopy, enabling classification of 14 phytolith and 45 di- atom morphotypes. Our data support paleoenvironmental re- constructions of the Hazen Miocene paleolake. ∗