subfossil

The growth of larch trees at that time was 1.5 to 1.6 times greater than the average radial growth of trees during the last 2,000 years, and the northern treeline is thought to have been situated at least 150 km farther north than at present, as indicated by the presence of subfossil wood of that age in alluvial deposits of the Balakhnya River.

Arctic climate variability prior to 100 years BP 2009

In the ‘evolution laboratory’ that Madagascar represents, the discovery of this third Palaeopropithecus contributes to our understanding of the subfossil fauna species.

New Extinct Lemur Species Discovered In Madagascar | Impact Lab 2009

Holocene wood deposits in the southern Yamal Peninsula include a large quantity of subfossil tree remains, including stems, roots, and branches.

Climate change and forest distribution in the Arctic 2009

When determining the lithology of the sediments with the aid of Prof. Phillipe Muchez, it turned out that the core contained nearly 7 meters of sediments deposited after the end of the BO Phase (until now, 3 meters or less was normal) and this material consited mostly of peat or peaty clays, containing many well preserved and large subfossil plant remains and indicating very good pollen preservation.

Palynological Survey « Interactive Dig Sagalassos – City in the Clouds 2009

Radiocarbon dating of the subfossil wood (53 dates) was cross dated with ring series from the samples, allowing the construction of a continuous tree-ring chronology 7,314 years in length.

Climate change and forest distribution in the Arctic 2009

Change in the proportion of subfossil remains made up of spruce compared to larch in Yamal Peninsula samples [3].

Climate change and forest distribution in the Arctic 2009

Another important result of dendrochronological dating of large samples of subfossil wood is the ability to calculate the relative abundance of Siberian spruce in forest stands of the area, which is an index or proxy for the degree of continentality of the climate.

Climate change and forest distribution in the Arctic 2009

The existence of extensive frozen subfossil wood in the southern Yamal Peninsula in what is now the southern tundra zone was first noted and described by B.M. Zhitkov in 1912 during an ornithological expedition through the area.

Climate change and forest distribution in the Arctic 2009

These results are based on earlier subfossil wood collections carried out by Russian scientists as well as modern collections of subfossil wood from the Kola, Yamal, and Taymir Peninsulas, and at the mouth of the Lena River.

Climate change and forest distribution in the Arctic 2009

The radiocarbon dates of subfossil wood were used to define preliminary calendar time intervals and then the cross-dating method was used to identify absolute dates of tree-ring formation.

Tree rings and past climate in the Arctic 2009