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