This stream traverses relatively rugged, forested lands and is the locus of an important fossil bearing formation. These fossils are embedded in the Lower Santa Margarita Formation and include Astrodapsis spatiosus;also rare species of gastropod Thais cf.
This river flows through hilly, wooded landscapes and is notable for its rich fossil deposits. The fossils embedded in the Lower Santa Margarita Formation include Astrodapsis spatiosus;also rare species of the snail genus Thais.