Round Top (Contra Costa County, California)

Round Top is an extinct volcano located in the Berkeley Hills, just east of Oakland, California, within Contra Costa County. The peak is part of the Sibley Volcanic Regional Preserve, which was originally established in 1936 as Round Top Regional Park. This park was one of the first three parks in the East Bay Regional Parks District. The park was renamed Sibley Volcanic Regional Preserve in 1958 in honor of Robert Sibley, the second president of the park district, shortly after his death in 1958.

Round Top
Highest point
Elevation	1,764 ft (538 m) NAVD 88[1]
Coordinates	37°51′00″N 122°11′34″W[1]
Geography
Round Top Contra Costa County, California, U.S. Show map of California Round Top Round Top (the United States) Show map of the United States
Parent range	Diablo Range
Topo map	USGS Oakland East

The volcanic activity that created Round Top started around 10.2 Million years ago^[2] and continued for over a million years.^[3] The area has two known main volcanic vents: one under the Lawrence Berkeley National Laboratory and the other at Round Top itself. Over time, the Round Top vent has tilted and fallen sideways, a testament to the geological changes that have shaped the region over millions of years.^[2]

See also

• Robert Sibley Volcanic Regional Preserve
• List of summits of the San Francisco Bay Area