Tag: marine

John Muir National Historic Site

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The John Muir National Historic Site, located in Martinez, California, is a tribute to the life and work of the famous naturalist and conservationist, John Muir. While the site is not primarily known for its fossils, it does offer a rich geological history. The site’s geologic story began between about 145 million and 56 million years ago, when sediments that would become the site’s bedrock were deposited. The Great Valley Sequence, the geologic formation underlying the site, was formed over millions of years. Geologic processes such as plate tectonics and fluvial activity (the flowing of water) continue to alter the landscape to the present day. The site is also relevant for park management, including erosion, flooding, faults, and earthquakes. While the site does not have a specific fossil hunting area, it offers a unique opportunity to explore the geological history and the influence it had on John Muir’s life and work. Visitors can explore the beautiful grounds and orchards, the historic Victorian house of the Strenzel/Muir families, over 360-acres of trails on Mt. Wanda, and the Strentzel/Muir Gravesite.

Remember that this is a National Park and you should inform yourself of the appropriate permissions and restrictions of National Park land when it comes to fossil hunting.

Sources:

Where to Find Marine Fauna Fossils near Coalinga, CA

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Fossil Sand Dollars, Clams, and Coral.

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Guide to Finding Fossils at Rincon Point

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Directions: 

According to this page’s first citation, ” from LA, travel north on the Ventura Freeway (101) towards Ventura. Travel about an hour, north towards Santa Barbara. Exit onto Highway 150 (towards Lake Casitas) and park immediately after leaving Route 101. The fossils are found along the freeway offramp and up the hill above.”

Geology of the Area:

Rincon Point is a famous surfing spot on the border of Santa Barbara and Ventura County. The fossils of Rincon Point are found off a freeway cut that exposes 16 different layers of Santa Barbara Formation strata. Santa Barbara County was underwater for most of Earth’s history, but slowly rose to the surface during the Cenozoic Era, especially as a result of the Miocene dated tectonic movements that created the San Andreas Fault.

Fossils:

Pliocene-Pleistocene dated fossils are abundant in the sediments off the freeway. The fossils are marine fauna including invertebrates such as bryozoa, mollusks, gastropods, and Pecten.

Other Fossil Sites Nearby:

Coal Point: link

Ojai Trails: link

Sespe Wilderness: link

Surfer’s Knoll: link

Works Cited:

Gary Kindel, “Fossil Collecting Sites in North America,” (Digital Rockhound’s Companion Site 2009) http://www.digitalrockhound.blogspot.com

“US and Canadian Fossil Sites — Data for California” http://donaldkenney.x10.mx/STATES/CA.HTM

“Offshore Geology of Santa Barbara County” (County of Santa Barbara Planning and Development ) http://www.sbcountyplanning.org

Guide to Finding Fossils at Topanga Canyon

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Geology:

Topanga Canyon is part of the Topanga Canyon Formation. It contains middle Miocene sandstone and siltstone.

Paleontology: 

The sediments contain large quantities of gastropods and pelecypods (most are shell prints). It is recommended to go after a rain when the fossils have been washed (at least partially) out of the matrix.

topanga_shells

Directions: 

“from the Ventura Freeway (in the San Fernando Valley), get off at the Valley Circle/Mulholland Drive exit Turn left onto Valley Circle, cross over the freeway and proceed onto Mulholland Drive. Turn right onto Valmar Avenue — Valmar becomes Old Topanga Canyon Road. At Mulholland Highway, bear right and prepare to turn left back onto Old Topanga Canyon Road in 1/8 mile. Turn left and proceed up Old Topanga almost a mile, past the point where the road switches back upon itself. From this point until the top of the hill, you will encounter fossiliferous road cuts on your right. The first embankment contains a massive oyster reef.” (see first citation for source)

Works Cited:

Sam Park, “Fossil Collecting in California” (The Fossil Forum 2008) http://www.thefossilforum.com

“Topanga Canyon fossils,” (Rockhound Blog October 12, 2006) http://www.rockhoundblog.com

Where to Find Fossils at Centerville Beach

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Geology of the Area: Centerville Beach is part of the Rio Dell Formation, giving it very similar geological history to the Scotia Bluffs nearby. The sedimentary rocks were once a mud rich layer that was deposited on the edges of a shallow sea during the Pleistocene epoch. Look for layers of grey unconsolidated mud, which will be fossiliferous and have shell fossils protruding from the surface. Low tide is the best time to look for fossils on a beach.

Paleontology/ Fossils Found: Moon Snail, Giant Pacific Scallop, Clam, Pandora shell, Cockle, Snail, Channeled Dogwinkle, and other fossils can be easily found on the cliffside of the beach.

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Works Cited:

Leslie Scopes Anderson, “Unearthing Evidence of Creatures from Deep Time,” (Humboldt U 2011) www2.humboldt.edu

Ellin Beltz, “Fossil Localities – Humboldt Bay Area,” (Field Trips by Ellin Beltz 2008) http://www.ebeltz.net