Hello,
Ya, it’s the very top of a solitary coral. I have seen lots of those in the Needmore formation in Virginia. Although it’s a different formation and time period, I’m sure they can be found in other formations. I attached a picture from the “Lost River” site on my webpage. This one, the very tip was visible like yours, and I extracted the rest of it to see what it was.
I have no clue about the genus, I can’t seem to find much info on them in the literature.
Later!
Jayson