I came across a paper presented at the recent Lunar and Planetary Science conference that gave academic credence to the possibility that the Anatolia trough may have formed through karst-like process similar to that observed in Hungary. The paper is in this link and you'd have to scroll down near the bottom to find it.
ftp://www.lpi.usra.edu/pub/outgoing/lpsc2005/full77.pdf
Sz. Berczi (2005), Lunar and Planetary Science XXXVI. Possibility of Karst Morphology on the Martian Surface at the Merdidiani Landing Site from Comparison with Terrestrial Analogs.
I added some of my own observations to expand on the article and posted it to my site www.marsgeo.com. I've also added tons more links, which I hope others will find useful.
So don't hesitate to make any comments and to correct me on any of my points about Anatolia.
Cheers,
Aldo.