One type of plant, the safest style, built away from geological faults.

The mine remained profitable until 1879 when a geological fault affected production.

There may be a geological fault at the site which could carry water to the surface even more quickly.

The village is bounded both to the north and to the south by geological faults.

However, the commercial extraction of coal is limited by geological faults in the area.

The gap is the result of relatively rapid erosion along a geological fault.

"Short of being on a geological fault, I don't think you could find a worse place," he said.

But lo and behold, it is not at any previously known geological fault.

He hails from southern California, where they have geological faults of their own.

It looks like a geological fault rather than an old river bed, though that was my first guess.