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I have always thought Lake Michigan/Huron look mighty round if you follow from the north end down through Green Bay and the Fox river to the west, and cut into
by phkahler 3y ago
I have always thought Lake Michigan/Huron look mighty round if you follow from the north end down through Green Bay and the Fox river to the west, and cut into Canada along the Niagara Escarpment [1] on the East. There seem to be signs of a round structure all the way down in Ohio. But while this does form a roundish structure, the history is quite different than an impact:
[1] https://en.wikipedia.org/wiki/Niagara_Escarpment https://en.wikipedia.org/wiki/Niagara_Escarpment
Still I wonder, what if this other stuff happened in this shape because of a giant impact crater billions of years ago before all that?
- sdflhasjd 3y agoThere's also the "Nastapoka arc"[0] of Hudson Bay that looks a bit cratery, but is apparently of a different origin. [0] https://en.m.wikipedia.org/wiki/Nastapoka_arc https://en.m.wikipedia.org/wiki/Nastapoka_arc
- dboreham 3y agoCraterish?
- webnrrd2k 3y agoCrateroid?
- layer8 3y agocrater-like
- IIsi50MHz 3y agoThe Crater-ion Collection [cue logo, cue greyscale film of various impact events]
- foota 3y agoApparently arcuate is the preferred term
- dotancohen 3y agoI just read that word over here for the first time: https://en.m.wikipedia.org/wiki/Nastapoka_arc https://en.m.wikipedia.org/wiki/Nastapoka_arc As someone who reads a lot in general and on the topic of space in particular, I am surprised to only discover this word today. I suspect that it is not a common word, or maybe it is a new word.
- foota 3y ago(I found it in the same place :-) )
- greggsy 3y agoThought to be formed as a result of lithospheric flexure during the Trans-Hudson orogeny, apparently.
- evah 3y agoIt's very distinctive on an elevation map. https://mrgris.com/projects/oilslick/ https://mrgris.com/projects/oilslick/ I remember thinking there's no way that's not a crater.
- throwaway5752 3y agoIt's not related to the escarpment, that is a glacial feature. Their origin is not impact related, either, it is tectonic (the rift valley from a failed continental rift): https://en.wikipedia.org/wiki/Midcontinent_Rift_System https://en.wikipedia.org/wiki/Midcontinent_Rift_System
- jacquesm 3y agoThere is the Sudbury crater. https://en.wikipedia.org/wiki/Sudbury_Basin https://en.wikipedia.org/wiki/Sudbury_Basin Just North-East of Lake Huron.