Collection place
- CA-Mrn-266, Tomales Point, Point Reyes53
- Tomales Point, Point Reyes, Marin County53
- CA-Sol-2, Solano County, California42
- Lindsey Slough, Solano County, California42
- Solano County, California42
- CA-Mrn-275 (Mendoza Mound 1), Marin County, California41
- Churchill County, Nevada39
- Drakes Bay, Point Reyes, Marin County38
- CA-Nap-1 (Goddard Mound), Napa Valley, Napa County33
- Middle Napa Valley, Napa County, California33
- Oakville area, Napa Valley, Napa County33
- NV-Ch-18 (Lovelock Cave), Churchill County, Nevada32
- CA-CCo-250, Concord, Contra Costa County30
- CA-CCo-259, Rodeo, Contra Costa County30
- Concord, Contra Costa County, California30
- Humboldt County, Nevada30
- NV-Hu-300, Humboldt County, Nevada30
- Rodeo, Contra Costa County, California30
- Unincorporated western Contra Costa County, California30
- CA-Mrn-242, Drakes Estero, Drakes Bay29