Sculptured images on stones and terra - cotta plaques have been found from excavations at Guwahati .
Terra - cotta plaques unmistakably represent Buddha and which can be assigned to the tenth or the eleventh century .
Sculptured images on stones and terra - cotta plaques , which unmistakably represent Buddha and which can be assigned to the tenth or the eleventh century , have been found from excavations at Guwahati .