In 1879, A. Corre surveyed Ba The mountain and recorded a number of stone artifacts and two inscriptions. After that, French scientists and officials visited. The eastern slope of Ba The mountain, below the foundation of Linh Son pagoda, is the center of a complex of relics spread over a large area, with brick seams and brick floors appearing in the pagoda grounds and on the road at the foot of the mountain.
The site was excavated in 1993, 1994 and 1998. The site was excavated, revealing two architectural sites and two burials. The area of site was surveyed by the French in the first half of the twentieth century in the architectural space of Linh Son Tu and the surrounding area. The excavation in 1998 - 1999 revealed the entire large architecture built of brick and quite large scale, about 22m long east-west, 17m wide north-south, with a plan spread over 200m2, divided into many large and small compartments, has a courtyard and drainage pipes, consists of one or two floors, built of brick or stone. The deepest trace of the foundation line adjacent to the soil was found at a depth of 2m compared to the mound surface. The structure of the project includes 36 stone (25) and brick (11) foundation walls, divided into 22 large and small structures including foundations, yards, corridors, steps, drains...
Through excavation results, it shows that the architecture has two phases of construction and use. The early stage below only a few collapsed structures, built of quality bricks, measuring 30 x 15 x 7 or 8cm.
In the deepest cultural layer in the north of the site, a reburial jar made of rough pottery, black pottery bones and red pottery shirt was discovered. The pottery jar is 0.67m in diameter, 0.4m high, covered with a large bowl-shaped lid, inside the jar are a few small pieces of organic matter, 5 gold beads and 1 broken agate bead. At shoulder height outside the jar there is a small jar made of pottery, smooth bone, red in color.
In the religion of ancient Oc Eo culture residents, like other residents in the world, always attach great importance to the burial of the dead. The burial customs of ancient Oc Eo residents are extremely diverse with many different burial methods: cremation - burning the dead and then scattering the ashes into the river; water burial – floating the dead down a river; Burying the dead - burying the dead in the ground, etc. Among the methods, burying the dead in jars is a style found in Oc Eo culture and ancient Southeast Asia. This is a way of burying the dead by taking the deceased's ashes and putting them in a jar and burying them in the ground, or by taking the remains after a period of burial.
Linh Son Nam is a very unique architecture of religious nature, dating from the 1st to 9th centuries. The site was ranked a special national site in 2012.
