In 1955, the excavating archaeologists found evidence of postholes, ditches, and pits inside the fort. An archaeological excavation in Lund uncovered the postholes of several such churches. Excavations in the 1990s, revealing postholes, confirm that wooden steps were built. More than 600 postholes were found in the excavations. There are postholes, quarries and evidence of iron smelting and bone working. People seem to have lived in huts, but only postholes and pits survive. Grooved ware pottery found in the postholes dates to around 2900 BC. Other archaeologists believe that regular residence would have produced more postholes. The site consists of six concentric oval rings of postholes, the outermost being about wide. The purpose of the 16 postholes associated with the mound and enclosure is still undiscovered. In Ain Mallaha traces of postholes have been identified. Construction using postholes is known as earthfast or post in ground construction. Postholes at one end have been interpreted as supporting a timber facade.