As you might imagine, scientists have been attempting to discover organic objects that can be dated securely pretty steadily for the past fifty years.Other organic datasets looked at have included varves, which are layers of sedimentary rock which were laid down annually and contain organic materials; deep ocean corals, speleothems (cave deposits) and volcanic tephras; but there are problems with each of these methods.

But before that, only fragmentary data is available, making it very difficult to definitively date anything older than 13,000 years.

Reliable estimates are possible, but with large /- factors.

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Cave deposits and varves have the potential to include old soil carbon, and there are as-yet unresolved issues with fluctuating amounts of C in ocean currents. Reimer of the CHRONO Centre for Climate, the Environment and Chronology, School of Geography, Archaeology and Paleoecology, Queen's University Belfast and publishing in the journal , has been working on this problem for the last couple of decades, developing a software program that uses an ever-increasingly large dataset to calibrate dates.