Laguna Martínez is one of six other lakes in Costa Rica where maize pollen was recovered. This lake has a surface area of 1.5 ha and a water depth of 3.6m during the dry season.
| 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? |
|---|---|---|---|---|---|---|---|---|---|---|
| 451 | Unknown | MicroSample | pollen | 4760 | 40 | 5512 | 5589 | 5329 | No | |
| 452 | Unknown | MicroSample | pollen | 4410 | 40 | 4988 | 5274 | 4863 | No |