Sao Chaling is one sculpture of natural. It came from 2 things.
They are sandstones in "Kretachias" period whith look like mushroom on the topaged about 130 million years old,
and sandstone in "Dinosour" period aged about 180 million years old.
Which is the tunk in the bottom . It was break down by weather, rain and wind for ages.
It was gravitation force rains made it maintain until today Sao Chaliang comes from the word "Sa Liang" that means "Stone Pillar".
(original text of a national park panel)
Links: Pha Taem National Park - Ubon Ratchathani Province -