Tootesilt

Tootesilt is a term used in regional geology to describe a fine-grained sediment dominated by silt-sized particles, typically 2 to 63 micrometers in diameter. It often includes clay minerals and varying amounts of organic matter, giving it a light to medium brown color when exposed. In hand specimen, tootesilt is relatively soft and plastic when wet, becoming stiffer as it dries or when compacted.

Formation and properties: Tootesilt forms in low-energy settings such as lakes, backwaters, and slow-moving sections of rivers and floodplains, where suspended silt settles from the water column. Over time, the accumulation may be interbedded with organic-rich layers or minor sand layers. The texture is finer than typical loam and coarser than clay, with variable cohesiveness depending on moisture and cementation.

Distribution and interpretation: The term is used in several regional geological guides to classify a specific sediment texture. Deposits are found in temperate zones with periodic flooding, wetland basins, and delta-front environments. Geologists analyze tootesilt to reconstruct historic hydrology and sediment supply.

Uses and environmental significance: As a soil constituent, tootesilt can influence fertility and moisture retention. It can act as a sink for organic carbon and for certain contaminants, affecting groundwater quality. In some locales, it is studied for construction suitability and as a potential source for pottery temper, though this is not widespread.

Etymology and classification: The term is believed to originate from regional dialect or locality name associated with early researchers; in some sources it is treated as a textural subclass within silt deposits. See also silt, loam, alluvium, sedimentology.