Macrofossil reconstruction of preboreal wetland formed on dead ice block a case study of the Borzechowo mire in East Pomerania, Poland

In or der to re con struct en vi ron men tal changes in the Borzechowo mire, a sed i ment core was sub jected to macrofossil and strati graphic anal y ses. The mire is lo cated in the east ern part of the Pom er a nian Lakeland (Tuchola For est, northern Po land). It is a limnogenic mire, formed as a re sult of terrestrialisation of a wa ter body. The time of basal peat accu mu la tion was es ti mated by ra dio car bon dat ing as 9860±130 14C BP (Gd-12393) and by palynological anal y sis as Preboreal. The anal y sis of macrofossils shows that in that pe riod, con sid er able hy dro log i cal changes took place in the study area. These hy dro log i cal changes were caused by melt ing of dead ice blocks that was com mon place in the Late Gla cial and the Early Ho lo cene.