I'm reading about Sodom and Gomorrah on [wiki](https://en.wikipedia.org/wiki/Sodom_and_Gomorrah#Historicity) when I come across this:
"One such idea is that the Dead Sea was devastated by an earthquake between 2100 and 1900 BCE. This might have unleashed showers of steaming tar."

What is a "tar shower?" Are there any documented cases of this? When I googled this, it went to the visual dictionary referenced in the Wikipedia article, which didn't explain the concept either.