The "Markley Gorge" is the name usually applied to the buried canyon known to exist under the south-central Sacramento Valley. This ancient gorge appears to have developed prior to upper Eocene deposition, and has an approximate maximum relief of 3,000 feet. Present well control indicates that it extends from the region north of the city of Sacramento to the region beyond the southwesterly limits of the Rio Vista gas field and probably drained into what is now Honker Bay.

The author will discuss his interpretation of the origin and extent of this interesting erosional feature and its relation to larger structural deformations.

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