[Geology2] Is The Snake River Plain Was Formed By A Diverging Process?

The Snake River Plain picture:
http://volcano.oregonstate.edu/vwdocs/vwlessons/hot_spot_pics/SRP_Thematic_Map.gif (the image link taken from Google image search) from: http://volcano.oregonstate.edu/vwdocs/volc_images/north_america/yellowstone.html

Let's take Eastern part of the plain (the one that is closer to Yellowstone). For this part of the plain, its North-West border would fit exactly South-East border if the plain between borders gets cut off the image.

And, as the ridges are very diverse in their shape, the only explanation of the exact fit, as for me, would be the divergent process to spread The Snake River Plain.

I've looked through approx a couple of dozens .gov and .edu sites on The Snake River Plain, - none of them mentioned that the borders of the East of The Snake River Plain would fit each other.

Am I missing something? Any links on discussions of the snake river plain as a divergent boundary?

"The Snake River Plain As A Divergent Boundary. Yellowstone Caldera."
http://divergent-boundaries.blogspot.com/2011/06/snake-river-plain-as-divergent-boundary.html

Thanks.

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