README.TXT CUSTOM COLOR PALLETES As an easy way to assign color to geologic map units, several custom color palettes have been designed to replicate the colors shown on the CMYK Color Chart (plate A). The CMYK (cyan/magenta/yellow, with K = 0) color combinations shown on this chart have been used for many years on geologic maps published by the U.S. Geological Survey. The custom color palettes were created in Adobe Illustrator 8.0.1 on a Macintosh and saved in Illustrator EPS format. Note that some colors can only be distinguished from one another on monitors that can display 16.7 million colors. To download the custom color palletes, return to the main page and then click on the appropriate links.