Earth’s Cryosphere, 2017, Vol. XXI, No. 1, p. 3-10
SOIL WEDGE STRUCTURES IN THE SOUTHERN COAST OF THE FINLAND GULF
I.D. Streletskaya
Lomonosov Moscow State University, Department of Geography,
1, Leninskie Gory, Moscow, 119991, Russia; irinastrelets@gmail.com
Various wedge structures have been studied in detail in sediments near Nizino Village (Leningrad region). Periglacial effects on the sediments that host, fill and underlie the wedges are inferred from their coefficients of cryogenic contrast which approach or exceed 1. Primary soil, sand, and ice wedges formed as a consequence of frost cracking 15.5 kyr ago. The obtained disagree with refute the seismic origin of the Nizino wedges.
Late Pleistocene, Holocene, cryogenesis, frost cracking, soil wedge, ice wedge cast, paleopermafrost