 ISSN 1392-110X ISSN 2029-056X (online) |
2011 m. Nr. 1 Changes in the development of frost wedges in the Middle
Warta valley deposits (Central Poland)
In the alluvia of the middle Warta River valley, different kinds of frost wedges and fissures such as syngenetic ice wedge pseudomorphs, epigenetic ice wedge pseudomorphs and wedges, and fissures with primary mineral infilling were documented. The formation of ice wedges of the older generation is dated to the transition from the Middle Plenivistulian to the Upper Plenivistulian, and ice wedges of the younger generation and sand wedges date to the coldest period of the Upper Plenivistulian. The thawing of some ice wedges preceded the degradation of permafrost and was due to thermokrast processes in the Upper Plenivistulian. Keywords: ice-wedge pseudomorphs, sand wedges, thermokrast, Vistulian, middle Warta River valley, Central Poland |
Issues:
2011 - Vol.53 No. 1, No. 2, No. 3 2010 - Vol.52 No. 1-4 2009 - Vol.51 No. 1-2, No. 3-4 2008 - Vol.50 No. 1, No. 2, No. 3, No. 4, No. Priedas 2007 No. 1, No. 2, No. 3, No. 4 2006 No. 1, No. 2, No. 3, No. 4 2005 No. 1, No. 2, No. 3, No. 4 2004 No. 1, No. 2, No. 3, No. 4 2003 No. 1, No. 2, No. 3, No. 4 2002 No. 1, No. 2, No. 3, No. 4 2001 No. 1, No. 2, No. 3, No. 4 |