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Although more recent and more detailed mapping is available in many areas, this set of maps is still the most detailed interpretation available for the entire state.In an effort to include new geologic mapping completed after publication of the Geologic Atlas of California, CGS began compiling a new Regional Geologic map series at the same scale as the Geologic Atlas. The first of this new series was published in 1981. The Regional Geologic Maps are the same scale and cover the same areas as the previous Geologic Atlas, but show more detail and use geologic formations rather than the simplified geologic time-based units. Six Regional Geologic maps were published at 1:250,000 before CGS changed to completing and publishing 1:100,000 scale geologic maps. Publishing at 1:100,000 allows regional geologic maps to show nearly all of the detail from the original mapping. 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