BrVQ
BraVSQ Oak Chronology for the region Västra Götaland by Alf Bråthen. It was originally published in the book: Alf Bråthen: Dendrokronologisk serie från västra Sverige 831-1975. Rapport RAÄ 1982:1. ISBN 91-7192-511-2.
In the book four different Chronologies are given, with average values and the number of measurements it is based on. There are also documentation about the origins of each sample. The four chronologies are named: "Block 1", "Block 2", "Block 2b" and "Block 3". Unfortunately there are some severe errors in the material, which have to be corrected before the chronologies can be used.
Block 1
Recent: 1615-1975. At least 4 samples depth: 1634-1974, 9 contemporary stems as best. No problems found.
Block 2
Historical: 1337-1804. At least 4 samples depth: 1380-1779, 16 contemporary stems as best. Problems:
- The period 1554-1613 has almost zero-correlation towards other references, and has to be removed. It is obviously erroneous. The reason for this problem is not yet known.
- Value for 1650 is missing.
Block 2b
Historical: 1197-1490
Block 2b is very problematic. It is dated by Bråthen to 1490, and the youngest part is obviously correct dated but the older part does not correlate at all on that position, but very well at the position corresponding to 1197 for the whole block. I.e the samples in the oldest part are erroneously dated 239 years too late! Samples of two very different ages are mixed together.
Reading carefully the documentation, and constructing the samples positions and lengths the mistakes was revealed: Six samples from Götene and Kungslena churches which are from early 12'th century are mixed into the chronology at a position 293 years too late. As there is only an average series available only the "clean ends" may be used as reference, i.e 1419-1490 and 904-974 (missdated as 1267-1197). And of those only 939-974 (35 yrs) and 1419-1482 (63 years) has at least 4 samples depth.
Block 3
Lödöse, archeological: 780-1298 (Missdated: 831-1349). At least 4 samples depth: 867-1185. As best: 19