Dear Dr Millard,
I checked the definition with the British Geological Survey, and the units Ka, Ma and Ga are referenced to AD 1950 (the standard present in BP). They are not simply the 'scalar' units thousands of years, millions of years, etc. I was also merely giving an example of how they are used, not making a statement that the holocene actually began 10, 9 or whenever Ka ago.
Cheers, Neil
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