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GEOLOGIC YInIfE SCALE <br /> Prepared by Bruce A. Collins, Ph.D., Glenwood Springs. CO <br /> MILLIONS PERIOD( FORMATIONS! <br /> E OF YEARS SYSTEM/ SERIES/ EPOCH UNITS PRESENT <br /> p BEFORE LENOTH <br /> A PRESENT pERiOD EPOCH (IN MILLIONS IN THE <br /> (Ma) OF YEARS) ASPEN AREA' <br /> 0 - 0.01 HOLOCENE 0.01 7711, alluv/um, colluvlum <br /> C <br /> Older glacial deposits <br /> E 0.01 - 2 QUATERNARY PLEISTOCENE 1.99 Basalt flows NW of <br /> N Woody Creek <br /> <br /> ~ <br /> 2 - 5 PLIOCENE 3 <br /> Z <br /> <br /> ~ 5 - 24 MIOCENE 19 <br /> ~ 24 - 37 TERTIARY OLIOGOCENE 1g Granodiodte plutons Df <br /> C 37-58 EOCENE 21 <br /> 58 - 65 PALEOCENE 7 Youngest porphyries <br /> 2J <br />A <br /> spen area ores ( <br /> M Aspen Mountain Sill <br /> E 65 - 144 CRETACEOUS 79 MesaverdeGroup <br /> S M nco al <br /> <br /> O Morrison Formation <br /> Z 144 - 208 JURASSIC gq Cunis Formation <br /> O Entrada Sandstone <br /> ~ Chinle Formation <br /> C 208 - 245 TRIASSIC 37 <br /> <br /> Formation <br />te B <br />id <br />St <br /> r <br />ge <br />a <br /> 245 - 286 PERMIAN 41 Maroon Formation <br /> P <br /> Eagle Valley/Gothic Fms. <br /> A 286 - 320 PENNSYLVANIAN 34 Belden Formation <br /> <br /> ~' 320 - 360 MISSISSIPPIAN Leadville Formation <br /> E 40 Chaffee Group (Gilman <br /> O 360 - 408 DEVONIAN 48 sandstone, Dyerpolo- <br />mite <br />Parsing Formation) <br /> Z , <br /> <br /> O 408 - 438 SILURIAN 30 <br /> ~ Manilou Dolomite <br /> C 438 - 505 ORDOVICIAN B7 Peerless Formation <br /> Sawatch Ouanzite <br /> 505 - 570 CAMBRIAN 65 <br /> 570 - 4600 PRECAMBRIAN Eras, Eons, Ma 4030 quanz monzonite, quartz <br /> Before Present n ma i vin <br /> Neoproterozoic 570 - 900 330 ~ See Generalized Stra- <br /> Mesoprolerozoic 900 - 1600 700 tigraphic Section. <br /> Paleoproterozoic 1600 - 2500 900 <br /> The Archean Eon 2500 - 4000 1500 Bold-Italics denote units <br /> The Hadean Eon 4000 - 4600 600 ex osed in Smu ter Mine <br />