This is an old revision of this page, as edited by Look2See1 (talk | contribs) at 20:28, 22 May 2016 (→External links). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.
Revision as of 20:28, 22 May 2016 by Look2See1 (talk | contribs) (→External links)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff)
Robert Sibley Volcanic Regional Preserve is located in the Berkeley Hills just east of Oakland, California, USA. The park straddles Alameda County and Contra Costa County. The park can be entered from Oakland on Skyline Boulevard or from Contra Costa County on Old Tunnel Road.
The park was one of the first three parks established by the East Bay Regional Parks District (EBRPD) in 1936. It was originally named Round Top Regional Park. Round Top (elevation 1,761 feet/537m) is an extinct volcano in the Berkeley Hills. It is home to several stone labyrinths of recent origin. The park was renamed for the second president of the EBRPD, Robert Sibley, shortly after his death.
The preserve contains a volcanic center that, about 10 million years ago, produced most of the lavas that underlie the East Bay ridges from Inspiration Point in Tilden Regional Park to Moraga; geologists refer to this local volcanism as the Moraga Volcanics. Subsequent compressive strains produced by various local faults including the Hayward Fault folded the lava-bearing rock formations, tilting the Round Top vent complex on its side. Folding, erosion, and a quarry operation exposed a cross section of the great volcano, providing an excellent means to study a Central Coast range volcano. Lava within the vent has been dated by UC Berkeley at 9.5 million years old.
See also
- Moraga Formation — Pliocene epoch basaltic lava formation in park.
Referneces
External links
"Contra Costa County, California" is an invalid category parameter for Template:Coord missing.
The problem is usually caused either by a spelling mistake or by an-over-precise category.
For a full list of categories, see Category:Unclassified articles missing geocoordinate data and its subcategories.
| East Bay Regional Parks | |
|---|---|
| Parks | |
| Shorelines | |
| Preserves/open spaces | |
| Wilderness areas | |
| Recreation areas | |
| Trails | |
| Other | |
 | This Contra Costa County, California–related article is a stub. You can help Misplaced Pages by expanding it. |
- Contra Costa County, California articles missing geocoordinate data
- Berkeley Hills
- East Bay Regional Park District
- Parks in Alameda County, California
- Parks in Contra Costa County, California
- Geology of Alameda County, California
- Geology of Contra Costa County, California
- Pliocene California
- Volcanism of California
- Parks in the San Francisco Bay Area
- Contra Costa County, California, geography stubs