What is carbon 14 dating
These new techniques can have a dramatic effect on chronologies.
The barbarians of the north were capable of designing complex structures similar to those in the classical world.
In addition, samples need to be thoroughly cleaned to remove carbon contamination from glues and soil before dating.
This is particularly important for very old samples.
Luckily, we can measure these fluctuations in samples that are dated by other methods.
Tree rings can be counted and their radiocarbon content measured.