Re: [paleo_bio_dinosaur_ontology] dinosaur skeletal anatomy

["David Marjanovic" <david.marjanovic@gmx.at>]

> Ma is a time measurement from the present, as in the North American
> Stratigraphic Code or the "Stratigraphic Nomenclature and Description" of
> the USGS.  From the latter (p. 45 in the 7th edition, 1991):

Oh, wow.

However, a is the SI symbol for year... and :-) over here, I don't see why I
should be bound by a North American affair that is in addition tailored to
the English language.

> "[...] or in annum as ka for kilo-annum, Ma for mega-annum, Ga
> for giga-annum for ages. For example, boundaries of the Late Cretaceous
> Epoch currently are calibrated at 66 Ma and 96 Ma,

Without "ago"? ~:-| I've seen that, too, but I thought those authors were
"just" dropping the y of "mya" for "million years ago".