October 2014

Of late, there has been a flurry of articles about the caves located in the cliffs on the west side of More Mesa.  These stories have been precipitated by a recent and unfortunate incident of a young man being severely injured by a falling rock in one of these caves.  While we cannot offer solutions to prevent this from ever occurring again, we can offer some fact-based scientific information about why it is extremely dangerous and unwise to traverse down to the beach or visit, and especially linger, in any of these caves.

Geology Facts:  The cliffs of More Mesa are distinctly different on the east and west sides.  The east side cliffs consist of Monterey Shale, a clay formation that is 6-18 million years old.  This section of the cliff erodes slowly and its 100 foot drop to the beach below is along a sloping grade.

However, the west side of the cliff face is of the Santa Barbara Formation, a younger sedimentary formation of marine sand that is only 700,000 years old. (The big blobby tar seeps oozing onto the More Mesa beach are from the Santa Barbara formation.)

This younger material erodes very quickly.  Indeed, sea cliff retreat in the Santa Barbara Formation has been demonstrated to be about 10 inches a year, the highest rate observed along this portion of the South Coast. What this all means is that the western cliff is steep, unstable and unpredictable.  Further …

• The western cliff should never be used to access the beach
• Visitors to More Mesa beach should never use areas close to the western cliffs
• The caves should never be occupied.

One further cautionary note … when it starts raining again, do not use the trail closest to the cliff face after a rain.  It may disappear as you are admiring the view.  Please be careful!

County of SB Website: Offshore Geology of Santa Barbara County

January 2012

Native Habitats on More Mesa Among the many ecological treasures of More Mesa are its plants and plant assemblages, also known as habitats. Six habitats, Oak Woodland, Riparian, Chaparral, Grasslands, Wetlands, and Coastal Sage Scrub, are listed in the Biological Resources Report released a year ago.

While we have provided a link to native plants on this site, last year we also began to describe habitats. In May, we added a feature on Vernal Pools, a type of wetland.

Coastal Sage Scrub This endangered habitat is found on More Mesa. From the California Coastal Commission web site: “Seventy to ninety percent of southern California’s coastal sage scrub has been destroyed. Nearly 100 species of plants and animals that depend on coastal sage scrub are currently classified as rare, sensitive, threatened or endangered by federal and state agencies.”

This is an excellent video on Coastal Sage Scrub produced by the San Mateo Creek Conservancy.

Coastal Sage Scrub, a Fragile Habitat from San Mateo Creek Conservancy on Vimeo.