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Rare Early Geological Map of Southern California -- Illustrating It as a Petroleum Region.

This rare map focuses on the petrogeology of Southern California, including what would appear to be a very early study of fault lines and depressions.

The map is one of the earliest maps to focus on Southern California and one of the earliest to show it as a petroleum-producing region.

The map also notes gold, silver, and copper mining in the San Gabriel and San Bernardino Mountains, including Lytle Creek. There is even a Marble deposit noted south of the Santa Ana River.

An Indian Village is noted on the upper Santa Margarita River.

Below the map is a profile showing the entire coastline from Santa Barbara to the Mojave Desert.

Guillemin-Tarayre's map is part of a rare set of scientific works published by the French government. The map illustrated a section that relates to geology and mining in California and Nevada. In 1864, as a result of a French military expedition to Mexico, the Commission Scientifique du Mexique was established. At the time, mining in California and Nevada were the focal point of a great deal of interest in Europe.