[UnbelievingScumOnTheOtherSide]

Couldn't possibly have been caused by huge rocks hitting the surface from an angled flight path???

Actually, no. Meteorites striking a surface make round holes except at the most extreme angles and then they make streaks or skip (making a line of round holes). That's why you don't see a lot of oval craters on the moon, most of which were made by angled impacts.

[Conan the Librarian]

Well it could have been caused by materials falling from the impact of a meteorite. Splatter from that strike COULD have caused it.

The best theory I have heard is that they were caused by natural springs that form along the limestone aquifers underneath the south east. Sinkholes could also lend a hand.

The teardrop shape could be something as simple as prevailing winds.

We may never know otherwise.