TOO BAD IT WAS FOGGY :(
Jenner Travel Blog› entry 11 of 15 › view all entries
Goat Rock Beach is a sand beach in northwestern Sonoma County, California, United States. This landform is a sub-unit of Sonoma Coast State Beach, owned and managed by the State of California. At the northern terminus of Goat Rock Beach is the mouth of the Russian River and the southern end of this crescent shaped expanse is the massive Goat Rock, an iconic outcrop of the Sonoma Coast, which is barely attached to the mainland by a narrow isthmus.
Goat Rock Beach is frequented by beachcombing visitors, but usually not in high numbers except in mid-summer; there is some wading and surfing activity, although these uses are moderated by the legendary rip current generated by a steep gradient into the water that leads to an underwater trench parallel to the waterline.
The Russian River, with its mouth at the north end of Goat Rock Beach, is Sonoma County's largest watercourse both in flow rate and lineal extent. Immediately beyond the Russian River discharge to the Pacific Ocean is the coastal town of Jenner. North of the mouth of the Russian River is Jenner Beach. Goat Rock protrudes into the Pacific at the south end of Goat Rock Beach.
Along Goat Rock Beach and the adjoining beaches, massive rock outcroppings are found both on the shore and protruding from the Pacific Ocean as small skerries. Among these rugged structures are natural arches formed by powerful wave action selectively eroding weaker strata of the rock formations.
Goat Rock Beach is subject to continuing marine erosion as well as windborne erosion, thus creating a situation where an average of one to three feet per year of land mass is lost, except for the hardest of outcrop formations . In winters of heavy storms this value can be yet higher. Over the last geologic epoch the land has been subject to uplift, a process combined with marine erosion, which has created a marine terrace above the entire extent of the beach. This marine terrace elevation varies approximately 30 to 150 feet (10 to 50 meters) above mean sea level, which results in a steep bluff directly above the littoral zone, and a succession of terrace levels.
The sea stacks along the coast at Goat Rock Beach consist of rocks from the Franciscan Complex, formed within an era of plate collision along the western coast of North America. From about 200 to 30 million years ago, the North American Plate was in continual collision with the Farallon Plate. A variety of rock types resulted from this collision, including pillow basalt, chert, and marine sandstone. During the plate collisions, these rocks were considerably faulted and crushed into melange, which is a mixture of ground-up matrix and resistant pockets of rock floating within. When melange is eroded by wave action, the softer part of the matrix is washed away, leaving the more resistant blocks exposed in the ocean as sea stacks.
Vertical sea stack formations, a geological hallmark of this shoreline, appear standing out of the water or on the beach resembling sculptures. Occasionally these stacks appear on the marine terrace, indicating their ancient genesis on the sea floor prior to uplift. These rock formations are characteristically composed of sandstone with layers of quartz.
The active San Andreas Fault runs roughly parallel and near to the coastline of Goat Rock Beach. Soils within the site are classified as coastal beach sands (where rocky shoreline is not evident) and escarpment group soils on the marine terrace; typically soils above the marine terrace are in the Rohnerville loam group.
The oldest natural history of this area related to mammals manifests in a series of rock outcrops about one third of a mile south of Goat Rock Beach, positioned above the shoreline on a low lying marine terrace. There are uplifted sea stack formations with prominent rubbing marks about two to four meters in elevation above the ground surface, a height too high to have been caused by modern bovids.
The earliest known human settlement of this site was by the Native American Coast Miwok and Pomo tribes. As early as 1849 archaeological discoveries were recorded in the vicinity, and to date several prehistoric kitchen middens and other types of tribal habitation finds have been made. Goat Rock Beach is part of a Mexican land grant called Bodega Rancho. The Russians are thought to have begun logging the old-growth forests directly above the coastal prairie in the early 19th century.
The underwater delineation of the property is considered to extend to 1000 feet from the shoreline.
In the era circa 1920, a sizeable quarrying was conducted at Goat Rock, which activity produced the apparent separation of Goat Rock from the mainland. Quarry products were transported to the mouth of the Russian River via a now abandoned rail line; some of these materials were used to attempt the construction of a jetty in the mouth area, but that project was eventually terminated.
Flora and fauna
There are three distinct habitats present at Goat Rock Beach, including marine, littoral zone and coastal prairie. The marine environment presents gray whales, harbor seals and California sea lions as well as a multitude of fish species and other marine organisms; in fact, several species of anadromous fish enter the Russian River estuary and migrate for tens of miles up the Laguna de Santa Rosa and other Russian River tributaries. Furthermore, a variety of pelagic birds and shorebirds are locally in evidence. Additionally there are modest kelp beds and other marine vegetation. The littoral beach environment has fewer organisms than more southerly zones of California, because of the colder temperatures here.
The coastal prairie soils on the marine terrace above the beach are moderately well drained and granular with moderate soil permeability; these features manifest high erosion potential and moderately high bio-productivity. Acidity of these loamy soils is medium to high, and thus some vegetative stunting and hospitality to rare plants is offered; however the tree stunting is not as pronounced as farther north along the Mendocino coast, which presents extensive and exaggerated pygmy forests. The upland environment on the coastal prairie offers a range of grass species and wildflowers including varieties of lupine, thistle and wild oats. The typical annual plant productivity is approximately 1500 kilograms per acre of air dried yield per annum in an abundant moisture year, and about half that amount in a very dry year.