Here, in the middle of a 'rock-solid' continent, is a big basin that slowly sunk to the centre of the earth (to the Moho, at least!). What caused this? Note the circularity of the lake shorelines around it. All the region got sucked into this, including my fav. Bruce site. I've studied it, but have never understood it.There, wasn't that a good intellectual break from disasters, and general political incompetence?
2 comments:
Ancient salt dome melting away? We did have oceans here once.
What other possibilities are there?
Beautiful picture, anyway.
Just something about the tectonics at the time that opened up this big circular hole.
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