Shellmounds are man-made mounds of earth and organic matter that were built up by humans over thousands of years. They were created by the people native to the San Francisco Bay Area. One archeologist estimated there were more than 425 shellmounds in the Bay Area at one point. Paul Gilbert wants to know what happened to them.

Additional Reading

• There Were Once More Than 425 Shellmounds in the Bay Area. Where Did They Go?
• Who Were the First People to Live in the Bay Area?
• Court rules a 260-unit apartment complex can go up at 1900 Fourth St., a site the Ohlone consider sacred

Reported by Laura Klivans. Bay Curious is made by Olivia Allen-Price, Katrina Schwartz, Sebastian Miño-Bucheli and Brendan Willard. Additional support from Kyana Moghadam, Jessica Placzek, Natalia Aldana, Carly Severn, Joe Fitzgerald Rodriguez, Ethan Lindsey, Vinnee Tong and Jenny Pritchett.