Rillito Fan (AZ AA:12:788) is one of the many Middle Archaic to Late Archaic and later Ceramic Period sites excavated in the Santa Cruz River floodplain along the Interstate-10 expansion corridor (Mabry 2008). Rillito Fan site was first excavated by the Center for Desert Archaeology in the mid-1990s (Wallace 1996) and then again in 2001 (Wöcherl 2007a). Two samples of carbonized maize were recovered from pit features associated with residential structures and directly dated (Wallace 1996; Wöcherl 2007b).
| ID | Other ID | Type | Subtype | Uncal BP (years) | ± 1 σ (years) | Median cal BP (years) | Lower cal BP (years) | Upper cal BP (years) | δ13C | Contaminated? |
|---|---|---|---|---|---|---|---|---|---|---|
| 578 | Beta-161851 | MacroSample | cupule | 760 | 40 | 695 | 764 | 656 | -10.8 | No |
| 579 | Beta-90317 | MacroSample | cupule | 2860 | 40 | 2981 | 3140 | 2863 | No |