So it has been discussed that they could be impact craters from huge chunks of ice from the ice sheet on North America that may have been thrown up from impact sites. Various aspects of these bays seem to substantiate this scenario but I've been curious about it.
When I look at the aspect ratio of the oval shapes, I suspect they would reveal a good clue as to the parabolic trajectory those ice chunks took and while not being able to be accurate, I can presume that trajectory implies a fairly high parabola implying a relatively steep initial launch trajectory. I might even suggest it appears to be at least 45 degrees or more on the impact end of the trajectory based on the oval aspect ratios, which implies a similar launch trajectory.
Then I look at a simple diagram of varying different kinds of impact craters like this one:
![Image](https://i.imgur.com/svZ5bU8.png?1)
If I imagine the ice being thrown up matching the presumed trajectories necessary to make those bays, it appears to imply an aspect ratio of a source impact crater in the ice sheet that would have to be very small if it would only be as deep as the low density ice sheet of conservatively 2 miles thick, because there is no evidence of an actual impact crater at the source area where the bay lines converge.
And considering the size of these bays, it implies some pretty huge ice chunks being thrown extremely far, so that all doesn't seem to jive to me.
But if it wasn't a comet impact, but some kind of electrical strike of some kind discussed here, I'm curious to understand how that would work? With my limited understanding of these huge plasma scaring strikes, if I imagine it to be like a huge lightning strike, I wonder if it would penetrate the ice sheet and have an activation point of extreme heat on contact with the actual earth beneath the ice. If this were the case then it seems that the ice sheet would have a reaction of immediate rapid vaporization from underneath the ice sheet which could explain how huge ice chunks could both be launched up at that trajectory, as well as maintaining their huge size, because if there was a rapid expansion of vaporized water under the ice sheet, it would effectively create a uniform broad upward force that perhaps a bit further out from the epicenter, could possibly allow a uniformity of huge pieces of ice to remain in tact on the start of their trajectory.
If anyone comprehends what I'm trying to explore here and can connect some dots for me on the plasma earth strike model when hitting ice sheets, it would be very interesting to understand it better. Cheers.