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.
The river flows through hilly, woodland regions and is characterized by an important fossil-rich stratum. The fossils embedded in this layer include Astrodapsis spatiosus;also rare species of the snail genus Thais.