and others, Map 1-629. Great Plains, eastern Colorado: Few changes, except for revised age assignments. Rocky Mountains and Colorado Plateau, western Colorado: Compiled by Helen M. Beikman and Philip B. King from published and unpublished data of U.S. Geol. Survey geologists. Radiometric ages of Precambrian rocks and of Cretaceous-Tertiary, instrusives-from: Z. E. Peterman and C. E. Hedge, 1968, Chronology of Precambrian events in the Front Range, Colorado: Canadian Jour. Earth Sci., v. 5, no. 3, pt. 2, p. 749-756; and written communications by Ogden Tweto. Final review and correction of compilation by Ogden Tweto, U.S. Geol. Survey, December 1971. Connecticut.-See New England. Delaware .-See Maryland. Florida.-Geologic Map of Florida, 1964, scale ap
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