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The Dean Decker Site (48SW4541/48FR916) is located along the terraces of lower Sand Creek and portions of Red Creek in the northwest fringe of the Great Divide Basin. Cultural materials extend continuously for 6.5 kilometers. Archaeological materials consist of scatters of thermally altered rocks, hundreds of cobble hearths and unlined hearth stains, thin scatters and dense concentrations of lithic artifacts, and occasional groundstone artifacts. The lithic materials are predominantly local cherts and quartzites.

Diagnostic artifacts include probable Fremont pottery and Late Prehistoric projectile points. It is likely that this site represents the accumulation of small campsites from the Middle Archaic through the Protohistoric Periods. The archaeological data available from this site can contribute significantly to research regarding prehistoric settlement and subsistence patterns of small aboriginal groups.