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1 ' extinction or over-kill of mammoth and a shifting of hunting emphasis to Bison Antiquus (Eighmy 1984). Prehistoric habitation and use of northeastern Colorado and adjacent regions spans approximately 12,000 years from the late ' Pleistocene epoch through historic contact. Although the preponderance of reliably dated archaeological sites in the region represent the past 5,000 years, evidence of occupation is nearly ' continuous throughout this 12,000 year span. The first formal regional chronology was devised by Mulloy (1958). Mulloy's scheme ~' ' was designed specifically for the northwestern plains, but it was generally adopted by archaeologists working within eastern ' Colorado. Wood (1967) formulated a chronology specifically for the eastern plains region, which relied on Colorado site data and which ' built on Mulloy's work. Frison (1978) further revised and refined Mulloy's northwestern plains chronology. Since cultural and ' physiographic boundaries are generally indistinct in the archaeological record, Frison's chronology was considered largely ' applicable to northeastern Colorado. Detailed chronological outlines for northeastern Colorado were prepared more recently by 'I , Morris (1982:22) and Eighmy (1984:12); these two chronologies differ only slightly. Eighmy's chronology is used in this section ' and throughout this report. Eighmy recognizes seven distinct temporal episodes from Paleo-Indian through Contact, within which additional temporal and/or cultural subdivisions may occur. 3.1.1 Paleo-Indian Stage ' Eighmy divides the Paleo-Indian Stage into four periods: Pre- Clovis, Clovis, Folsom, and Plano. Although this chronology ' includes a Pre-Clovis period, the earliest undisputed date of human occupation in eastern Colorado is a radiocarbon age estimate of ' 11,200 +/- 500 years Before Present (B.P.) from the Dent Clovis 22