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The First GLO Map of California.
Foundational 19th-century wall map of California, showing the earliest progress made in the official mapping of the state.
This map was the first in a series of yearly progress maps that showed the extent of government surveying in California. These maps are a fundamental source for tracking the early development of the state. For a comprehensive collection of the Public Survey maps see David Rumsey's collection.
The map shows townships (six-by-six mile grid structures emanating from three "baselines" and "meridians") that have been established, with those surveyed (subdivided into sections and returns) indicated using an "S".
Fascinating detail abounds. Adjacent to San Diego is a "New Town," but the rest of Southern California is sparsely mapped. In the central valley, Tulare Lake still appears, not yet having been drained. Three meridians are shown at Mount Diablo, Mount Pierce (Humboldt), and San Bernardino.
This map was published by the General Land Office and prepared by P.S. Duval & Company. It was included in the 1854 issue of the Report to the Surveyor General.
In the lower right corner is the facsimile signature of John Coffee Hays as the U.S. Surveyor General for California.
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