Those are Carolina Bays. They are a product of water, not meteors. It is possible that a huge asteroid hitting the ocean was the indirect cause of them, but they are not craters. They have been excavated and there are no extraterrestrial remains there that would be the result of an impact.

What happened was something caused a tsunami a long time ago. This tsunami made the one on 12/26 look like a ripple. There is some evidence that it went as far inland as the foot of the Appalachians at the NC/VA border.

The sandhills, the enormous sandbars in the piedmont, the carolina bays, etc are all evidence of one mind bending tsunami.

I don't know what caused it, but if you look off the east coast you'll see where a giant chunk of the continental shelf has collapsed and sunk down. I'd bet that had something to do with it. Something the size of Massachusetts sinking all at once is bound to have thrown up a lot of water.

When the water retreated it scowered out the bays. If you look at pics of where the tsunami hit asia you can see smaller versions of the bays here and there.

No meteor needed. In fact, meteors don't carve out shallow oval depressions like the bays. They are completely different animals.