Vernal Pools

Vernal pools are seasonally flooded depressions found on ancient soils with an impermeable layer such as a hardpan, claypan, or volcanic basalt.

Vernal Pools: Their History and Status in California's Central Valley
Interagency Vernal Pool Initiative Framework Agreement
Statewide Vernal Pools Map
Vernal Pool Assessment Preliminary Report from the Department of Fish and Game