http://bolin.su.se/data/larsson-2021-fosen-vedde-1 Simon A. Larsson Bolin Centre Database 2021 Datafile Terrestrial Sediment cores Tephra Tephrostratigraphy Major-element geochemistry EPMA Fosen Vedde Norway Earth science > Paleoclimate > Land records > Volcanic deposits Simon Larsson 2021-01-12T12:32:48+00:00 English 1 The dataset consists of six tables and is provided as an Excel spreadsheet (.xlsx) of individual tabs for each table, and as comma-separated values files (.csv), one for each table (character set: Western Europe, ISO-8859-15/EURO). There is also a tab/file titled "readme" that contains a basic summary and the table legends, which are also provided here. __Table 1.__ Tephra extraction results from Lomtjønnmyran with estimated tephra estimations at selected levels presented as shards cm⁻³ wet sediments. __Table 2.__ Tephra extraction results from Damåsmyran, with estimated tephra estimations at selected levels presented as shards cm⁻³ wet sediments. __Table 3.__ Tephra extraction results from Rørtjønna. __Table 4.__ Major-element oxide compositions of the Fosen Tephra at sites Lomtjønnmyran (sample LM593-594) and Damåsmyran (sample DM346-347) presented as oxide weight percentages and normalised to 100 % totals. __Table 5.__ Major-element oxide compositions of the Vedde Ash at sites Lomtjønnmyran (sample LM722-727) Damåsmyran (sample DM368-369) and Rørtjønna (sample RT5040-5045) presented as oxide weight percentages and normalised to 100 % totals. __Table 6.__ Secondary glass standard analysis results from the geochemical analysis sessions used for control and calibration. The research for which this dataset was created was carried out by Simon A. Larsson under the supervision of Stefan Wastegård in the years 2017⁠ – ⁠2021 and contributed to a new interpretation of the timing of the deglaciation on the Fosen peninsula during the Younger Dryas (Høgaas et al. 2021, in prep.). The collection of the sample material and the analyses performed for the production of this dataset was done with the aid of Fredrik Høgaas, Helene Sunmark, and Chris Hayward. Please, cite the appropriate articles when using this dataset. ###### Tephras analysed * Fosen Tephra (Lind et al. 2013) * Vedde Ash (Mangerud et al. 1984) ###### Site locations * Lomtjønnmyran fen (63° 40’ 17.7” N, 10° 32’ 49.5” E) * Damåsmyran bog (63° 47’ 59.2” N, 10° 48’ 32.3” E) * Lake Rørtjønna (63° 39’ 33” N, 10° 32’ 02” E) ###### Sampling and measurement methods The sample material for this research was collected in the form of sediment cores by use of Russian corers (Jowsey 1966). Tephra extractions were performed following slightly modified methods of Turney (1998) for initial extractions and Dugmore et al. (1995) for extractions for geochemical analysis. Tephra shard concentration estimates were calculated for the Lomtjønnmyran and Damåsmyran sites by comparing tephra counts with counts of Lycopodium spores from added tablets of known spore amounts. Geochemical analyses were performed using a Cameca SX100 electron probe microanalyser (a.k.a. EPMA) at the University of Edinburgh, Scotland (Hayward 2012). Glass standards Lipari and BCR-2G were used for control and calibration during the analysis sessions.