Wat Chedi Hoi in Pathum Thani, a stupa made from a great number of fossilized oyster shells. The shells were found in the temple's compound when its abbot ordered a water reservoir dug for the irrigation of the temple's herbal garden. After the discovery, the abbot and members of the temple committee continued to search in other places of the compound for more shells.

Many more were found, including some large ones, believed to be 8 million years old. Their quest, which ended in 1995, lasted for 12 years and resulted in the construction of the temple's chedi (fig.).