1. In Okinawa, rice was not cultivated until the Middle Shell Mound period. 2. The Huichin left a now-buried shell mound beside San Pablo Creek. 3. It follows the Shell Mound period and precedes the Sanzan period. 4. Scientific excavation of shell mounds in Japan began in the 1920s. 5. In 1947, archaeologist John Goggin described the three periods after examining shell mounds . 6. The Early Shell Mound period was a hunter-gatherer society, with wave-like opening Jomon pottery. 7. Shell mounds are also found in the islands and around the estuary of Saloum.8. Native Ohlone shell mounds were once found along the creek, especially near San Pablo Bay. 9. Both linear-relief, and'nail-impressed'pottery were found at Torihama shell mound , in Fukui prefecture, dating to 12000-11000 BC. 10. Of the four platforms that have been dismantled, none of the shell mounds has been removed.
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