Researcher Ho Tan Phan, who collected the fossils, found many sea creatures, especially Holothurian or sea cucumber, embedded in the corals.

According to scientists, the Huong river running through the imperial city of Hue has preserved evidence of ancient cultures in its layers of sediment, one of which is the Sa Huynh Culture, believed to have existed on the coastal plains of central and southern Vietnam.

The Sa Huynh Culture (1000BC-200AD), known as an urnfield (jar burials) culture, cremated dead adults and buried them in jars covered with lids, a practice unique to these people. It is also characterized by its distinctive ear ornaments featuring two-headed animals, commonly made from jade.