When was the Ionian order formed?

Ionian columns were formed in the 6th century BC, and the earliest examples can be traced back to the end of the 7th century BC. Its biggest feature is that there are two large scroll decorations on the stigma, and its origin may be the deformation of snails or shellfish in the ocean. Because the scroll is spread to both sides, the width of the stigma exceeds two-thirds of the diameter of the column.