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Mountains and Colorado Plateau, western Colorado: Compiled by Helen M. Beikman and Philip B. King from published and unpublished data of U.S. Geol.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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Eugeosynclinal deposits (-e) __________________________ 4 Ordovician and Cambrian___________-____________________ 7 Marine stratified rocks (O-G) ______-______-____-___ 7 Ordovician ________________________________________ 7 Marine stratified rocks (O) __________________________ 7 Eugeosynclinal deposits (Oe) __________________________ 9 Silurian and Ordovician ___________________________ 10 Eugeosynclinal deposits (SOe) ____________________ 10 Silurian __________________________________ 10 Marine stratified rocks (S) _______________________ 10 Eugeosynclinal deposits (Se) ________________ 12 Devonian and Silurian _____________________-___ 13 Marine stratified rocks (DS) _-____-_______-_-_-__-_-_ 13 Eugeosynclinal deposits (DSe) ___________________ 13 Devonian __________________________________________ 14 Marine stratified rocks (D) ______________________ 14 Continental deposits (D2c, Dac) ______________________ 16 Eugeosynclinal deposits (De) ________________________ 16 Lower Paleozoic _______________________________ 17 Marine stratified rocks (IP) __________________________ 17 Cratonic deposits __________________________ 17 Miogeosynclinal deposits _______________________ 20 Rocks of outlying areas ______________________________ 20 Eugeosynclinal deposits (IPe) ______________________

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