|Digital-Desert : Mojave Desert||
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Angeles National Forest - Cajon Pass
Springs will often form along faultlines because of the inconformity the fault produces allowing the groundwater to percolate to the surface. When a spring on the fault comes up in a low spot, it will pool and form a "sag pond." Lost Lake is such a sag pond forming as a result of the San Andreas fault.
Springs & Oases
San Gabriel Mountains