First I would like to congratulate Miria and her great imagination as she come up with really great idea with absolutely no proofs whatsoever.

I would say that if it was just a theory, then maybe..maybe. But I think Miria thinks too much into it and the idea seems to be off, not to mention Miria reasoning.

The Yoma origin was always bothersome and we all suspected that organization might have created them and awakened beings are another species to improve.

Quest for immortality ?
Ruling the world ?

Aparently if you mix those two, Miria came up with an idea "Eternal war using awakened beings".

...aha...

Ok, so what were the arguments ?

The swords are unnatural
There is most likely more than one continent but I have no fudge idea where
Handlers treat us like crap
There was a village which never heard of yoma..wow, happens.

The worst part is, Miria is probably 120% right, but how the fudge she got to that conclusion ?

Simple. She read about it in archives.

chapter 79 is just an introduction of an another continent theoretically accorded to Miria.
it leaves me wonder what exactly did Miria read in the archives.
it must not be easy slipping into the archive room of the organization and sniffing around without getting caught since the org. is pretty smart.
and Miria probably came up with the theory after the information she's read, b/c I don't think the organization would write in detail about their purposes and everything since I assume all of them know what they are doing.
I also think that Miria thought too much about the theory, since she only has a few evidences that she supposedly read in archives.
On page 14 of chapter 79, Miria said "This is a good chance to tell you all everything I know", so it's likely that she got nothing else beside those evidences and such.
her conclusion seems to be smooth-to-the-ears but it's very likely that it has some holes in it.

She come up with the dragonkind on her own, apparently she didn't read it anywhere...

...and why dragons !?

Well, from what i understood she red it all in archives. If not this would really be stupid on her part to assume this much.

Dragon - because they are big, scary and ancient legends about dragons are everywhere.

LOL for a second I was like WTF... wtf did i do now? =.=;;

She read the stuff in the archives. She could've made those up, but is she the type to make stuff like that up?

Actually, Chapter 79 just took a huge chunk of my fan fiction and made it actual Claymore canon.

^ I hope you did place that fanfic of yours under copyright?

I would love to read it Idelice!

I'm not really sure where it was, and I'll look for it, but didn't she also say that she had a source within the organization? The person supposedly told her all that stuff, then she confirmed it (using the archives?).