Natural Resources

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Mount Rubidioux Park-
Geology
 

Mount Rubidioux, weathered granite outcropping on the east bank of the
Santa Ana River, extends to a height of 559 feet from its base to an elevation of
1339 ft. above sea level. The Mountain is approximately 2 km long and .7 km wide.

Rust colored rings and curving lines may be observed in many rocks. These are a result of the oxidation of iron, manganese and other metals that are released from minerals during weathering. Oxidation occurs along surfaces of weakness, and then in time the rock fractures, leaving a round surface.

 
This spherical weathering is apparent over much of the exposed rock surface on Mount Rubidioux. Rock Weathering is apparent in the course of sand and gravely loam that has collected in many areas of the park.
 
Of concern is the finer sand and higher silt content of the majority of the soil types found in the park. These finer sand and silt types of soil are considered to be highly susceptible to erosion. Soil erosion, caused by lack of vegetarian cover, through pedestrian and vehicular traffic, is a major natural resource management concern on Mount Rubidioux Park. Natural Geological movements, coupled with man's impact in an area of highly erodible soils, have created a condition that has resulted in accelerated soil erosion.
 
The following soil types are found on Mount Rubidioux Park:
    • AoD: Arlington Fine Sandy Loam
    • CkF2: Cieneba Rocky Sandy Loam
    • HcD2: Hanford Coarse Sandy Loam
    • PaC2: Pachappa Fine Sandy Loam
    • TeG: Terrace Escarpment
    • VsD2: Vista Coarse Sandy Loam
Sources:
Natural Resource Management Plan
Mount Rubidioux Park
City of Riverside