phytolith

Some plants can take up silica in the soil, whereupon it is deposited within different intracellular and extracellular structures of the plant. After these plants decay, silica is redeposited in the soil in the form of phytoliths (from Greek, "plant stone"), which are rigid, microscopic structures of varying sizes and shapes.

Phytolith Analysis: An Archaeological and Geological Perspective
International Code for Phytolith Nomenclature 1.0
Modern Phytolith Assemblages from the North American Great Plains
Prospects and limits of a phytolith key for grasses in the central United States
The opal phytolith inventory of soils in central Africa —quantities, shapes, classification, and spectra
Starch grain and phytolith evidence for early ninth millennium B.P. maize from the Central Balsas River Valley, Mexico
Phytoliths as quantitative indicators for the reconstruction of past environmental conditions in China I:phytolith-based transfer fu...
Phytoliths as quantitative indicators for the reconstruction of past environmental conditions in China I: phytolith-based transfer f...
POLLEN, STARCH, PHYTOLITH, PROTEIN RESIDUE, AND FTIR ANALYSIS OF GROUND STONE AND IDENTIFICATION OF CHARCOAL FROM SITE 23SH23, AKERS...
The spread of grass-dominated habitats in Turkey and surrounding areas during the Cenozoic: Phytolith evidence