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As a result, radiocarbon dating isn’t so accurate: “Provided they are adjusted, radiocarbon dates are now considered reliable as far back as 5000 640, and only generally well back to the time of Christ.

Anything further back and the dates are as much as 800 years off.

evolutionary dating how accurate-30evolutionary dating how accurate-6

We explore the effect of these in Poaceae (grasses), a diverse plant lineage with a very limited fossil record, focusing particularly on dating the early divergences in the group. 2011), angiosperm-wide dating projects have inferred a very recent origin for this same clade, between 23 and 39 Ma (Bell et al. The influence of a divergent calibration point, represented here by the most recently published phytolith fossils (Prasad et al.

So scientists made calibration charts to make up for the variation.

Many questions in evolutionary biology require an estimate of divergence times but, for groups with a sparse fossil record, such estimates rely heavily on molecular dating methods. The incongruence between large-scale phylogenetic analyses including a few representatives of Poaceae and densely sampled analyses focused on Poaceae likely results from important variation in rates of evolution between grasses and other angiosperms (Gaut et al. We performed divergence time analyses of different data sets of plastid and nuclear genetic markers, sampling broadly from across all angiosperms.

Carbon dating is the ultimate benchmark of the evolutionary dating world.

Everyone assumes that dates that follow the word “radiocarbon” are accurate, precise and sure. The basic principle of radiocarbon dating is that plants and animals absorb trace amounts of radioactive carbon-14 from carbon dioxide (CO2) in the atmosphere while they are alive but stop doing so when they die.

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