Shards found in places like Qalhat, Kilwa and Julfar , mostly Chinese predating 1510 when the Portuguese Albuquerque plundered these cities. Even Marco Polo has described the Omani city of Qalhat. In additional to Chinese also Islamic and Thai pottery porcelain shards can be found. Similar pieces found during the excavations in Julfar, see reference. This reference is very useful in dating these pieces.
Collection of Chinese porcelain shards found in Oman. Similar sherds can be found in several ancient harbour sites in southern Arabia (e.g. Julfar) and East Africa.