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Re: Geographic Distribution of Deinonychosauria

 Myr, not Ma. Ma is for dates, not durations.

No. Contrary to what some journals believe, "Ma" is not short for "million years ago". It's the symbol for "megayear": the SI prefix _mega-_ and the almost-SI symbol _a_ for "year" (Latin _annus_).

"Myr" is English, not international, not SI or anywhere near it. That makes it a bad idea.

For dates, you have to spell out "_ Ma ago", or "il y a _ Ma" in French, or "vor _ Ma" in German.

 Or the patchwork quilt of terranes that is the Asian-North American

Quite. That must be a nightmare to reconstruct for pretty much any particular time.