Archive for August, 2008

‘Mount Ararat’, another Rockridge rock

27 August 2008

In my search for Rockridge Rock I’ve found some nice places. I consider the hillock embraced by Wilding Lane to be one, possibly even the Rock itself. One piece of lore that guides me is the fact that in the late 1800s, the Rock was easily reached from town and picnickers enjoyed an expansive view of the Bay and hills. The 1912 Oakland street map I rely on in my research labels the Wilding Lane hill “Mt Ararat.” Here’s the view from Wilding and Canyon View Lanes (click full size). If you strip away the trees and homes, the appeal of the place is obvious.

wilding lane view

Mount Ararat, unlike Cactus Rock near Acacia Avenue, is right next to the main drag of Broadway Terrace. Here’s a map to help you find the place.

The Crestmont serpentine patch

20 August 2008

crestmont serpentine patch

Every neighborhood in Oakland with a “mont” in its name has bedrock exposed. Crestmont is a good example. Most of the Crestmont neighborhood, north of Redwood Road and east of Holy Names University, sits on serpentine rock—more precisely, serpentinite. This is the biggest exposure, at the intersection of Crestmont Drive and Westfield Way. Below is an exposure just to the north (click full size), which is somewhat bluer than the blue-green of the main patch. I’ve shown pieces of this rock to local geologists, asking them “Is this serpentinite or blueschist?” They usually say “Beats me” or, even better, “Yes.” These rocks are not easily assessed by just eyeballing them.

crestmont blue serpentine

The open lot on the east side of Crestmont near Samaria Lane displays some splendid outcrops of this “lizard-skin” stone:

crestmont serpentinite


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