The island was inhabited by Quinnipiac Native Americans in historic times. Archeological digs have identified dog burials, middens, fire pits and other signs of human habitation.
- Grannis Island History Podcast by Cold Spring School
- Preliminary Report On the Excavations at Grannis Island (1952)
- Findings for Grannis Island compiled from the research of Jeanne van Orman
- Public Paddles to Its Archeological Treasure, New Haven Independent
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