What we’re seeing here is the ductility of the marble. According to the picture author, the marble dates from the Lower Proterozoic, more than 1.6 billion years ago to a period called the Aphebian Age.
When rocks are subjected to high temperatures and pressures over long periods of time, they will either transform or break. Marble is not a particularly ductile rock, but we do see it bend and take the shape imposed by the geological stress.