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Figure 2.2 Cultural Chronology of Northwestern Colorado <br />• <br />• <br />LJ <br />AGE TEMPORAL UNITS <br />B.C/A.D B.P. Northwestern Plainsa Northern Colorado Plateau <br /> Historic Perio istoric Perio <br />1600 400 <br /> Late Protohistoric Period <br />1200 800 Prehistoric <br /> Period <br />800 1200 Formative Period <br />400 1600 <br /> Late <br />0 2000 Plains <br /> Archaic Dirty <br />400 2400 Period Devil <br /> Ph <br /> ase <br />800 2800 <br />1200 3200 <br /> Middle <br />1600, 3600 Plains <br /> Archaic Green <br />2000 4000 Period River <br /> Phase <br />2400 4400 0 <br /> <br />• . <br /> <br />2soo asoo L <br />a <br /> <br /> <br />3200 5200 U <br />~; <br />Castle <br /> , <br />~ Valley <br />3600 5600 Q Phase <br />4000 6000 Early <br /> Plains <br /> <br />4400 6400 Archaic <br /> Period <br />4800 6800 <br />5200 7200 Black <br /> Knoll <br />5600 7600 Phase <br />6000 8000 <br /> <br />6400 8400 <br /> Paleoindian Paleoindian <br />6800 8800 Period Period <br />7200 9200 <br />7600 9600 <br />Mu 11oy (1958); Frison {1978) <br />Schroedl (1976); Jennings (1978) <br />11 <br />