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Historic Properties Treatment Plan, Collona Mine, Colorado 39 <br />The debitage classes that will be utilized during analysis are selected to allow assessment of <br />specific reduction strategies (e.g., core reduction, biface reduction). The attributes of each of <br />the debitage classes are summarized below. <br />• Initial reduction flake: These are large flakes that may or may not have a large <br />amount of cortex. The hard hammer percussion tends to yield odd shaped flakes <br />and is prior to a biface thinning stage flake. <br />• Bifacial thinning flake: lake: A flake that tends to have many platforms and feathered <br />terminations and is often "potato- chip" shaped as a result of a soft hammer. <br />• Pressure flake: Any flake, usually smaller than 1 cm, produced by pressure <br />flaking. The identifying features are small well - controlled platform preparation <br />as would be produced by antler tines. <br />• Flake fragment: Any flake that is missing the proximal end and does not have <br />a discernible platform or apparent bulb of percussion. <br />• Angular debris: Lithic materials that are angular or blocky in shape and <br />usually not possessing many of the identifying features mentioned in the <br />unidentified flake definition. It is usually derived when frost - fractured, impure, <br />nonhomogeneous, or flawed material is percussion flaked or when Lithic material <br />is heated rapidly to excessively high temperatures. <br />Other attributes recorded for debitage include size class, material type, and percentage of cortex <br />on the dorsal surface. Debitage size is measured with a template consisting of a set of <br />concentric circles 1 cm, 2 cm, 3 cm, etc., in diameter. Artifacts will be classified to the smallest <br />size class within which they entirely fit. <br />5.3.2 Groundstone and Other Artifact Anal <br />Groundstone Analysis <br />Cobbles, slabs, or other pieces of rock that exhibit evidence of grinding on at least one surface <br />will be classified as groundstone. Groundstone artifacts will be further classified into the <br />47599 TRC Mariah Associates Inc. <br />