Refers to the period named for the city and ruler Û Thong based in the Suphanburi Province of western Thailand. The style of the period came into fruition with the Khmer withdrawal from central Thailand in the second quarter of the 14th century. The period is generally classified under sub-sculptural styles known as groups A, B, and C, that combine Mon, Dvaravati, Haripunjaya, and Khmer elements in various ways. Group A features Buddha images with prominent foreheads, almond eyes, straight noses, and tiny conical curls. Images in Group B exhibit stronger Khmer influences as revealed in the square face and austere, impersonable facial expression. Group C features Buddha images reflecting Ayutthaya and Sukhothai influences as shown in the oval face, elongated body, smiling expression, and notched design on the robe flap over the left shoulder. Most Buddha images in all three groups are seated in the hero position on a pedestal with hands in the gesture of subduing Mara.