Yedoma
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Yedoma is an organic-rich Pleistocene-age permafrost with ice content of 50–90% by volume. Yedoma are abundant in the cold regions of eastern Siberia, such as northern Yakutia, as well as in Alaska an
Alas landscape in Megino-Kangalassky District, Yakutia
Goldstream Formation
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The Goldstream Formation is a geologic formation in Alaska that consists of a 10–35 m thick layer of perennially frozen, black to greenish-black, poorly bedded silt. It contains a thin, white, vitric,
Gold mining dredge at Cripple Creek, Alaska mining cut circa 1942. On far right, intact and unslumped section exposed in highwall of cut. uppermost, light-colored layer is part of Ready Bullion Formation underlain by dark-colored layer of its Giddings Forest Bed. Light-colored Goldstream Formation resting on thin, dark-colored, and less well exposed layer of Eva Formation (Eva Forest Bed). Between the Eva Forest Bed and bench, on which sheds rest, consists of Gold Hill Loess. Dawson Cut forest Bed at base is concealed beneath accumulated slump sediments. Bench at base of mining cut consists of gold-bearing Pliocene fluvial gravels. As is typical, mining cut that is directly befined and left of gold dredged is badly slumped and jumbled.