Our methodology is based on controlling core accumulation rates using a gamma autoregressive semiparametric model with an arbitrary number of subdivisions along the sediment.
Using prior knowledge about accumulation rates is crucial and informative priors are routinely used.
Radiocarbon dating is routinely used in paleoecology to build chronologies of lake and peat sediments, aiming at inferring a model that would relate the sediment depth with its age.
We present a new approach for chronology building (called "Bacon") that has received enthusiastic attention by paleoecologists.
This occurs due to the difference in mixing rates and residence times of carbon atoms in the two reservoirs, while variations in local conditions and mixing rates prevent there from being a universal ), however, temporal and spatial deviations from this offset, known as ΔR, are evident (Stuiver and Braziunas, 1993 ; Ascough et al., 2006).After continent-wide colonization, strong regional patterns developed and these have survived despite substantial climatic and cultural change during the late Pleistocene and Holocene epochs. Remarkably, we find evidence for the continuous presence of populations in discrete geographic areas dating back to around 50 ka, in agreement with the notable Aboriginal Australian cultural attachment to their country. Here we report 111 mitochondrial genomes (mitogenomes) from historical Aboriginal Australian hair samples, whose origins enable us to reconstruct Australian phylogeographic history before European settlement. Marked geographic patterns and deep splits across the major mitochondrial haplogroups imply that the settlement of Australia comprised a single, rapid migration along the east and west coasts that reached southern Australia by 49–45 ka.