Vernal Pools are shallow depressions that temporarily hold water after rain. Algae grows in the water, and organic matter also get trapped. In addition, blowing sand and stone fragments are also trapped in these pools. In the image below a Vernal Pool is drying out. You can see the algae and other material left on the bottom.
|Drying Vernal Pool|
|Vernal Pool with Vegetation|
|Prickly Pear and Grass|
|Yucca and Grass filling Vernal Pool|
|Vernal Pool with (dead) Tree|