Dating geology

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Human impact, primarily through intensified land use and decreased forest cover, has periodically led to increased aeolian sand drift both locally and regionally. Agricultural changes such as the 19th century land amalgamation, which would have led to enhanced wind erosion of fields, was simultaneously countered through the plantation of trees, which hampered transportation of aeolian sand into the lake. The continuation of intensified agricultural activity after the implementation of land amalgamation successively led to increased deposition of aeolian sand during the onset of the 20th century. Organic and carbonate contents of the sediments are generally anti-correlated for the majority of the succession although changes in land use during the past years, with substantial input of aeolian sand around the s, seem to have had a major impact on the total inorganic carbon TIC signal; possibly by a reduction in carbonate producing algae. Later agricultural changes during the s did not have any major effects on the lake since the plantation of pine and spruce in proximity of the lake acted as a shelter for aeolian sand drift. Correlations between the reconstructed aeolian sand content within the more recent part of the succession and documented historical events have been used to explain earlier aeolian sand deposition events during the 10th and 12th century. A continuous record of cultivated pollen points towards an uninterrupted human influence having an effect on the lake sediments during the past millennium.

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I serien Ålands kyrkor utgivare Ålands Museum har hittills utkommit följande verk:.

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Publications by the International Mortar Dating project

The Radiocarbon Dating Laboratory in Lund performs dating on geological and archaeological samples. Examples of material that we date are wood, charcoal, peat, macrofossils, bone and marine shells. Natural 14C can be used in numerous applications, of which radiocarbon dating, with the possibility for dating back to about years, is among the best-known and most practiced applications. Radiocarbon dating is based on the property that the activity concentration of 14C in dead tissues can be used to calculate the time that has elapsed since death occurred. This is possible since all living organisms contain nearly the same proportion of radioactive carbon in their carbon stores and since, upon the death of the organism, the carbon which survives decomposition continuously loses 14C by its radioactive decay.

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