thumb |right |400px |[[Pseudotsuga menziesii|Douglas Fir rises above Coast Live Oak/Pacific Madrone forest on northeast peak of Jasper Ridge - viewed from Sandhill Road]]

thumb |right |300px |Looking south across [[Searsville Dam|Searsville Reservoir from the dam on Corte Madera Creek and on to Russian Ridge]]

thumb |right |300px |[[Ohlone people|Ohlone mortars and pestles found at Jasper Ridge ]]

The Jasper Ridge Biological Preserve is a <!-- the source uses hectares --> nature preserve and biological field station formally established as a reserve in 1973. The biological preserve is owned by Stanford University, and is part of the Stanford School of Humanities and Sciences. It is located at south of Sand Hill Road and west of Interstate 280 in Portola Valley, San Mateo County, California. It is used by students, researchers, and docents to conduct biology research, and teach the community about the importance of that research. The preserve encompasses Jasper Ridge and Searsville Lake (actually a reservoir) and the upper reaches of San Francisquito Creek, along with the latter's Corte Madera Creek and Bear Creek tributaries.

Geology

thumb|right |300px |Coast Redwoods in San Francisquito Creek valley below Searsville Dam

thumb |right |300px |[[Lilium columbianum|Columbia Tiger Lilies (Lilium columbianum) in San Francisquito Creek valley below Searsville Dam]]

Jasper Ridge is part of the foothills northeast of the Santa Cruz Mountains and is bounded by San Francisquito Creek, Corte Madera Creek and Los Trancos Creek, although the preserve occupies only the northwestern half of the ridge. The hilly mass runs about ten kilometers from northwest to southeast and about half that in width.

Serpentine (Serpentinite) is the California State Rock. It was formed from deep sea or mantle rocks. This rock was squeezed toward the surface by tectonic plate movement, and thus feels greasy, as it has been polished over millions of years. Graywacke Sandstone after crossing Leonard's Bridge. This sandstone was part of the Franciscan formation 138 million years ago. Some rocks found at the preserve include: Greenstone, Chert, Serpentinite, Sandstone.

Ecology

In 1922, Cooper asserted that Jasper Ridge was historically chaparral, and cleared in the nineteenth century to open grasslands, primarily Eurasian wild oats (Avena fatua and Avena barbata).

Global change experiment

The Global Change Experiment studies the response of California annual grassland to global change, including elevated atmospheric CO<sub>2</sub>, temperature, altered precipitation, and increased nitrogen deposition.

Argentine ant invasion

This project studies and tracks the Argentine ants, an invasive species.

Bat monitoring

A station near the lake monitors bats at night, by converting and recording bat sounds (ultrasonic echolocation).

See also

  • Organization of Biological Field Stations

References

  • Official Jasper Ridge website
  • Organization of Biological Field Stations