Its right here
Gen 19:26 But his wife looked back from behind him, and she became a pillar of salt.
God made all creation in six days
Exo 20:11 For in six days the LORD made heaven and earth, the sea, and all that in them is, and rested the seventh day: wherefore the LORD blessed the sabbath day, and hallowed it.
Pillars of salt are like a walk in the park to him
Luk 1:37 For with God nothing shall be impossible.
The Hebrew word for salt there also refers to tar, pitch, asphalt "salts".
Its possible that nearby volcanoes erupted to destroy the twin cities, and with tar pits nearby, Lots wife may have been covered with tar.
What a way to go!