The labyrinths of Sibley

sibley maze

Doing urban geology in a place like Oakland adds a new question to the mental checklist that cannot be bypassed: “Is this truly a natural feature?” A boulder may be imported. A terrace may be an old railroad bed. Sibley Volcanic Reserve is a former quarry, therefore it’s safe to assume that this huge pit is not natural and that the labyrinth, one of several in the park, is of even later vintage. But park staff and other visitors have told me that some people insist, against all persuasion, that the labyrinths were made by cosmic visitors.

There is something about human beings, isn’t there? I used to trouble myself over our ability to believe nonsense, but now I realize that banging my head against that wall just hurts my head, and the wall likes it. The fact is, the general run of people love to be amazed. The trouble is, they aren’t particular about what amazes them.

Don’t get me wrong about labyrinths—they are good to experience, they do things to your head, they help pull you out of tedium. That’s cool. I think that crediting them to space aliens is a failure of imagination and a poor reflection on human ingenuity. What amazes me about labyrinths is that we invented them.

But what amazes me more satisfyingly is that people could examine this ground and figure out that it used to be the insides of a small basaltic volcano, now tilted onto its side. It takes imagination first, then the perseverance to test your imagination against the rocks again and again until every question you can think of has been met with a reasonable answer. I haven’t done that at Sibley, but having been to geology school I know how to do it if I set my mind to it. The people who did do that amaze me. They used directed imagination and rigorous skepticism instead of listening for voices and watching for signs, unhuman as that is.


8 Responses to “The labyrinths of Sibley”

  1. BrianR Says:

    I just went on that hike last week and was wondering about that labryinth … now I know it’s aliens ;)

    Now that I live in the East Bay, I’ve been using this blog for planning my future East Bay hikes … thanks!

  2. snappingturtle Says:

    that labyrinth has been there at least 20 years, if not longer.

  3. montclairoak Says:

    Hi Andrew,

    I walked in Tilden a few times, on the Wildcat Gorge trail running below Lake Anza. On the left side, you see some major rocks that look very volcanic with large openings. I’m curious if this is possible?


  4. Andrew Says:

    Debby, I’m not yet familiar with the Wildcat Canyon trail, but the stream runs through nonmarine sedimentary rocks of the Orinda Formation on both sides. The openings are probably related to weathering, like you see on Mount Diablo where an outer shell of the rock is hard but underneath it’s less well cemented, so it weathers out in pits. The official geologic name for this kind of formation is tafoni. But as I said, I haven’t walked that trail yet.

  5. volcanosummer Says:

    Hey Andrew! This is a very cool site, and I also checked out your page too. I’m going to be exploring that quite a bit in the coming days. I wanted to say thank you for linking my page on your blog. Apparently I’ve been getting a few visitors from you, and it’s always great to have the company! Keep up the good work, and I’ll link to your page after work tomorrow.


  6. sheldon white Says:

    I used to go up to that quarry in the winter to see if the pond had frozen over; it was fun to slide rocks across and break the ice. I was irritated when someone built the labyrinth, but what the heck.
    There’s a lot of interesting stuff to see as you go down that canyon, and if you skirt south into Huckleberry reserve there’s even more intersting remnants of human occupation. There’s some truly ancient old cars in a remarkable state of preservation on the backside of the ridge.

  7. No Direct Directions Says:

    I’ve been told there are 4 labyrinths here at the park. I’ve only found one with luck. I haven’t found the one pictured above. Does anyone have explicit directions of how to get to this one? Or, do you know of any guided tours to get there? I’m a true labyrinth lover, but not at all fond of hiking in circles. I really like to know where it is I’m going.

    I’ve noticed that none of the Park’s literature even mentions or directs you to the labyrinths, why I don’t know. Yet, it would seem reasonable that they would and could. Any help/guidance is really appreciated? Thanks!

    [Look for the huge pit. Also, it’s easily visible in Google Maps. The park’s literature doesn’t mention the labyrinths, and rightly so, because they’re not one of the natural or cultural features the preserve was created to protect.]

  8. Muzzy Says:

    I found one of these in Briones in Martinez. If you follow Reliez Valley Rd, you will eventually pass a farm and see a sign for Briones, head up in and its not far from the entrance.

    Heres a link to my pics of it:

    If anyone can give me an idea of where the other 2 are I’d love it thanks!

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