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Trend and plunge are often notated as PLUNGE -> TREND (for example: 34 -> 86 indicates a feature that is angled at 34 degrees below the horizontal at an angle that is just east of true south).

History

The oldest preserved geological map is the Turin papyrus (1150 BCE), which shows the location of building stone and gold deposits in Egypt.

The earliest geological map of the modern era is the 1771 "Map of Part of Auvergne, or figures of, The Current

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