According to Joussaume (1995), who led archaeological work at Tiya, the site is relatively recent. It was dated to a time period between the 11th and 13th centuries CE. Later dating places the stelae's construction some time between the 10th and 15th centuries CE. However, the building of megaliths in Ethiopia is a very ancient tradition, with many such monuments predating the
Common Era. The
menhir or
stelae at the site, "32 of which are engraved with enigmatic symbols, notably swords," likely mark a large, prehistoric burial complex. A German ethnographic expedition had visited the site in April 1935, and had found at one hour's journey to the south of the caravan camp the stone monoliths with sword symbol, which had been seen earlier by Neuville and
Père Azaïs. Surface finds at Tiya contained a selection of
Middle Stone Age tools (MSA) that are technologically similar to tools found at Gademotta and Kulkuletti. Because of a unique production process that uses what are called “tranchet blows”, Tiya tools might also belong to the same time span as these other two sites. Additionally, archaeological excavations at Tiya have yielded tombs. == Gurage stelae ==