The Freeper MrKatykelly suggested that something struck tangentially and rather than penetrate, skipped across the surface producing the elongated marks in the same arc.
Having thought on the matter I think that seems plausible.
There is also the possibility that a large comet, spiraling down to impact, would break up due to tidal stresses just like Shoemaker-Levy at Jupiter. Hence, the multiple, linear impact sites.
There’s a lot of stuff going -bonk- in the dark out there in the Oort Cloud that we don’t know diddley squat about...