Geology
The Lost Coast consists of undivided Cretaceous marine metasedimentary and sedimentary rocks of the North American Plate steeply uplifted by Mendocino Triple Junction interactions with the Pacific Plate and Gorda Plate. The Lost Coast includes Tertiary marine sedimentary formations north of the Mattole River and a portion of the Franciscan Assemblage called Point Delgada at Shelter Cove. The steepness of uplift has created a coastal ridge forming a drainage divide parallel to the coast. The drainage pattern between Usal Creek and the Mattole River is a series of short streams with steep channel gradients.
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