11 well-preserved burial sites in Rehoboth Beach date back to the late 17th century.
Archaeologists believe they may be the earliest known resting places of African-Americans in Delaware.
The burial site was found on Avery's Rest, which is a 17th-century plantation.
Hundreds of artifacts were also discovered.
The archaeological team will now try to identify the remains and hope to trace the steps back in time.
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