Judy fwd this.
Since you are in NM you will understand what I'm about to say. I too have this occasionally.
I use lots of swamp cooler pads and attribute it to a leaf trying to rise in the mist of mesh, that sometimes I leave on the pad and then cover w dirt.
Now in your case, since you or no one else I know uses my method of growing things in the desert, I can only think that what ever that leaf has to come through to develop might make that weird formation. I'm not sure if it's anything serious, just a leaf trying to make it in the desert.
What is it prying through to get to light??
Linda in CW AZ