Archive for November, 2009

Driveway of delight

29 November 2009

On a walk in North Oakland in connection with my hobby, I was delighted to see another example of a homemade decorative driveway. This is just the beginning of it:

rock driveway

Whoever built it had access to big chunks of waste glass as well as a variety of rocks from near and far. One of those, the green one in the lower right, is a fine specimen of actinolite schist:


To my knowledge, you won’t find such a thing in Oakland. I got my first hand specimen of actinolite from that rock shop on 101 next to Squaw Rock on the Russian River, south of Hopland. I asked the owner, as I often do, “What do you have that’s local?” and he handed me that one. The boulder in this driveway looks just the same.


Oakland from the air

22 November 2009


I have got to save up the money to ride the Eureka, our local airship, to survey Oakland from above. Good as Google Earth is, or a ride in a small plane, there is nothing like the leisurely, quiet flight of a lighter-than-air craft for viewing and photographing the ground. (Click the photo for a larger version.)

San Leandro Creek (2)

16 November 2009

San Leandro Creek is Oakland’s largest watercourse. Before Anthony Chabot dammed its upper reaches and the Bay shore was filled in, the creek was navigable up to East 14th Street. Where you enter the M. L. King Regional Shoreline at Hegenberger Road, San Leandro Creek looks quite capacious.

san leandro creek

Today the creek no longer has a lazy, sinuous course but instead runs down a straight ditch to its mouth near the Coliseum. The water looks wholesome, there’s wildlife all around, and the fishing seems to be good. Today’s paper showed men pulling sardines out of the bay here.

san leandro creek

An elaborate observation tower offers a view of San Leandro Bay, an unsung body of water between Alameda Island, Bay Farm Island and the mainland. My visit was near high tide; the map shows it as almost all mudflats.

san leandro bay

The spear of grassy marshland is Arrowhead Marsh. One story has it that the marsh was created in 1879 when Chabot’s dam construction, accomplished with hydraulic hoses, washed an enormous quantity of sediment down to the Bay. If so, that would be just another item in the long list of damages done to California during early statehood. But just as likely is that it was always there, along with 2000 more acres of marsh stretching across today’s airport and in a wide fringe around San Leandro Bay.

Here’s a view of the creek’s course across the East Oakland flats.


12 November 2009


Where the subsurface is inaccessible, you learn to prize the opportunities to sample it. A house on the crest of Montgomery ridge is upgrading its foundation, and the contractor has helpfully kept the tailings in this handy bin. It’s mostly sand and mud, but there’s a good deal of the Franciscan sandstone in it as well, plus hunks of the lovely red chert that seems to be part of the youngest detrital beds all over this hill. I restricted myself to collecting just one chert piece to add to the pile in the front yard.

I keep thinking that a concerted effort by enough Oakland citizens could help ensure that these ad-hoc trenching studies are properly exploited for their scientific value.