mushrooms and native plants are commonly seen, including parrot mushrooms and Solomon's plume flowers. Geology The San Andreas, San Gregorio, and Zayante earthquake faults affect the geology of the state park. Slightly southeast of park boundaries runs the San Gregorio; the Zayante fault intersects with the Aptos Creek Canyon in the park, and the San Andreas fault runs parallel to the Northeastern border. The epicenter of the Loma Prieta earthquake on October 17, 1989 was in this park. The quake's epicenter and Five Finger Falls are the two most popular attractions in the park. Various ancient sea stone sedimentary rocks can be found in creek beds in the park, as the park used to be a shallow inland sea. The soil of the park is sandy and loamy, and therefore vulnerable to landslides. Recreation The park is a popular spot for running, hiking, and horseback riding. Additionally, it is a common location for mountain biking, which can be done on several trails including the Aptos Rancho Trail, Split Stuff Trail, Terrace Trail, and Vienna Woods Trail. The park includes picnic tables where visitors can sit and enjoy the sights. Regulations Natural and cultural features of the park may not be removed or disturbed. Stay on marked trails to avoid erosion. Biking is only permitted on the Aptos Creek fire road and the four single track trails below the steel bridge. Omitting service animals, dogs are only allowed on the Aptos Creek fire road and the four single track trails below the steel bridge. Dogs must be on leash at all times. Horses are only permitted on the Aptos Creek fire road and the four single track trails below the steel bridge. Horses are not allowed past the steel bridge. There is currently no camping in the park. Fires are prohibited in all areas of the park. There is an $8 vehicle day use fee. See also List of California state parks References External links The Forest of Nisene Marks State Park state site The Forest of Nisene Marks State Park Friends of Santa Cruz State Parks site State parks of California Parks in Santa Cruz County, California Coast redwood groves Santa Cruz Mountains Aptos, California Parks in the San Francisco Bay Area Protected areas established in 1963 1963 establishments in California