Archive for the ‘oakland geology views’ Category

Emeryville

9 October 2014

The little town of Emeryville has almost no geology that passers-by would recognize. On the geologic map it’s displayed as largely artificial land and coastal alluvium.

emeryvillemap

The only people who see these things are builders and the geological professionals who advise them with their foundations.

The point was made from scratch—the original shore was a straight line pretty much where the railroad is now. Out at the end it’s been prettied up into Marina Park, a simulacrum of a wooded meadow. I like it there.

e-ville-point

A seawall, made of typical Franciscan riprap, protects it from the mild surf that manages to get here through the Golden Gate.

marinapark

The park-y part of Marina Park offers great views of Berkeley and points north. This is a good place to test your knowledge of the geography: Can you point out Strawberry Canyon, for instance. The highest point in this picture is Grizzly Peak.

e-ville-sculpture

We aren’t making any more artificial land in the Bay area, thank goodness. For a while there, people were planning to fill the whole Bay in. The nice thing about artificial land is that we can feel free to decorate it, whether formally as here or informally as at the Albany Bulb.

Manzanita ridge

28 April 2014

The ridge traversed by Manzanita Drive is one of Oakland’s highest residential areas, higher than 1400 feet. It’s the home-studded rise in the Oakland skyline to the right of Round Top in the blog’s banner image. Here’s the topographic view, from Google Maps:

manz-ridge-topo

. . . and here’s the matching part of the geologic map:

manz-ridge-geo

The ridge crest is held up by the Claremont Chert (Tcc), while Skyline Boulevard and Arrowhead Drive, running parallel just to its south, go through the crumbly Sobrante Formation (Tsm). (The other formations are the Orinda Formation, Tor, and the unnamed Eocene sandstone of upper Shepard Canyon, Tes.) Here’s the chert exposed at the west end of Manzanita; it and the next two photos click bigger.

Click for 800-pixel version

The views are terrific. Here’s the view north over the Huckleberry saddle to the smaller ridge of Claremont Chert that Elverton Drive skirts.

Click for 1000-pixel version

The middle of Manzanita offers fine views of Round Top.

Click for 800-pixel version

And the other end of Manzanita, past the unexpected Hills Swim & Tennis Club, is another saddle at the top of Shephard Canyon where the road to Canyon and Moraga crosses the hills.

skyline-shep-pinehurst-saddle

More than anywhere else in Oakland, this is an island in the sky.


Follow

Get every new post delivered to your Inbox.

Join 9,267 other followers