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 (yĕ′də-mə, yə-dō′-)
A type of permafrost consisting primarily of loess and organic material, believed to sequester large amounts of carbon.

[Archaic and regional Russian yedoma, backwoods, a place that lacks reindeer, yedoma, of Nenets origin; akin to Nenets yada, on foot (since the Nenets use reindeer to draw sledges and without them go on foot).]
References in periodicals archive ?
The project will provide for the first time quantitative data on rapid permafrost thaw over large regions, provide first-time data on the size of SOC pool components related to thermokarst, substantially enhance previous SOC pool estimates for Yedoma deposits and arctic river deltas, and characterize overall permafrost SOC distribution and vulnerability to thaw.
The transformation of illite and chlorite to randomly interstratified illite-smectite and chlorite-smectite respectively in circum-neutral to weakly acidic conditions has been documented for permafrost-affected soils Kriozems (Cryosols) formed in the cold, continental, climate of the Kolyma Lowland, North-East Siberia, as has the extremely weak intensity of chemical weathering of the Yedoma deposits (Alekseev et al.
Illite normally loses interlayer potassium and converts to a mixed layer dioctahedral illite-vermiculite in the upper acidic horizons of such soils or even to illitesmectite as it was shown for soils of Yedoma deposits (Alekseev et al.
A team of researchers, led by Stockholm University, investigated an area of coastline at Yedoma, the northernmost point of the Siberian Arctic, and found that the amount of greenhouse gas being released exceeded their expectations.