1985 22r, automatic carbed, I would post pictures but I'm in the middle of nowhere Kansas currently and in the need of some help, I'll explain the best I can.

Notice a antifreeze leak, no big deal, just replaced my radiator thought it could be a hose... get to poking around...

I found my leak. It isn't a hose. Right underneath the head and head gasket area toward the radiator, right behind the oil dip stick... there is this little circle formed (a little larger than a half dollar) into the actual engine block. I noticed the coolant forming and dripping down from there to the oil pan, down to the ground. I have no clue what this circular formation is but I'm pretty worried about a cracked engine block. It isn't doing anything crazy (yet) besides leaking the fluid.

If you can identify what that is what it does and why it's leaking antifreeze I would be utmost appreciative.