Yeah, slippery - makes me accidentally kick off my flops. I am more surprised that there were tarballs in the 60's? In Walton Co.? WOW!
I remember getting it all over me in the early 80's at Grayton Beach and Dune Allen. Mom always used baby oil. The stuff back then was much worse than what I saw last weekend. The stuff I saw looked and felt like brown playdoh that wasn't nearly as sticky as the black tar stuff. I guess that's from the crap they're squirting on it at the well.??

