Following three years of construction, later this year the public will be welcomed back to the EBRPD-managed McCosker property, a landscape transformed.
Tag: Sibley Volcanic Regional Preserve
Summer Issue 2012
A New Take on Sibley Preserve
Every day, east of Highway 24’s Caldecott Tunnel, thousands of commuters hurtle–or crawl–past a fine swath of the East Bay’s glorious greenbelt, where just off the highway, the north trailhead of Sibley Volcanic Preserve invites exploration.
Winter Issue 2012
From the Inside Out
Workers digging the new fourth bore of the Caldecott Tunnel are getting a once-in-a-lifetime view of one of the defining features of the East Bay: the range of hills that runs from San Pablo Bay south to Fremont. By visiting just a few accessible sites aboveground, you can find clues that tell the story of how these hills rose from their humble origins as deep ocean sediments and volcanic flows to the iconic fault-riddled hillsides of today.
Fall Issue 2006
When was the last volcanic eruption in the Bay Area? Where was it?
You can easily visit the 10-million-year-old Sibley Volcano (see Voice of the Volcano, April-June 2005) in the hills above Oakland. And college geology classes often visit the Nicasio Dam in West Marin to see pillow basalt lava that erupted deep … Read more
Spring Issue 2005
Voice of the Volcano
We all know that the East Bay hills are ripe for an earthquake, but volcanoes? Don’t look for lava in the headlines anytime soon, but there is a place in Oakland where an ancient volcano has laid bare a tale of fiery eruptions, long-extinct ecosystems, and the massive movements of tectonic plates. Many people go to Sibley Regional Preserve for the views of Mount Diablo or the quirky labyrinths at the bottoms of old quarry pits. But look closely at the trailside rocks, and you’ll see lava flows and a volcano turned on its side!
Fall Issue 2004
Proposed Development of Gateway Valley
After a series of controversies spanning 16 years, environmentalists and developers have reached a deal to preserve the only north-south land bridge over Highway 24 — Gateway Valley, a critical wildlife corridor and link in a 20-mile swath of open … Read more
Wildlife
East Bay Regional Newts
This article was the first nature article published by Bay Nature cofounder David Loeb. It originally appeared in Terrain, the magazine once published by the Berkeley Ecology Center. The small pond sits deep in an old quarry pit. Actually, it’s partly a pond … Read more
