At the grocery story a recently married couple were talking about the sinkhole here in Louisiana... They we're kinda upset to hear the news claiming they just left what they considered to be uncomfortable (I don't understand exactly what it ment) But Her husband was seismograph working and black tar (turned hard?? Huh? I dunno!) was bubbling from some sites ... Her word! Some tar bubbles turn hard to the touch. She was happy when job were over just returning to learn about sinkhole. Not sure if that information is important but I wanted to write.... It could be nothing, I asked her if it was mud or clay but she said it repels water and it's shiny... Anyone else could explain... Just odd is all