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Reply to Hughes

  • Christopher M. Stevenson (a1), Barry Scheetz (a2) and James W. Hatch (a3)

Hughes (1992) raises two points in his evaluation of our paper on Hopewell obsidian studies (Hatch et al. 1990): (a) Why did we not attempt to identify the several possible western United States sources from which our Hopewell specimens were derived, and (b) was it legitimate to report hydration-rim measurements with a.1 μm or less level of accuracy? These issues are addressed within the context of our initial research goals and through reference to the literature on optical microscopy.


Hughes (1992) plantea dos objeciones en su exaluación de nuestro artículo sobre estudios de obsidiana Hopewell (Hatch et al. 1990): (a) porqué no intentamos identificar las posibles fuentes en el oeste de los Estados Unidos en donde nuestros especímenes fueron obtenidos, y (b) es legítimo comunicar las medidas de los hordes hidratados con un nivel de exactitud de .1 μm o menor? Se discuten estos temas en el contexto de las metas originales de nuestra investigación y a través de referencias a la literatura sobre microscopía óptica

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J. Dyson 1960 Precise Measurement by Image-Splitting. Journal of the Optical Society of America 50: 754757.

J. B. Griffin , A. A. Gordus , and G. A. Wright 1969 Identification of the Sources of Hopewellian Obsidian in the Middle West. American Antiquity 34: 114.

J. W. Hatch , J. W. Michels , C. M. Stevenson , B. Scheetz , and R. Geidel 1990 Hopewell Obsidian Studies: Behavioral Implications of Recent Sourcing and Dating Research. American Antiquity 55: 461479.

R. E. Hughes 1992 Another Look at Hopewell Obsidian Studies. American Antiquity 57: 515523.

B. Scheetz , and C. M. Stevenson 1988 The Role of Resolution and Sample Preparation in Hydration Rim Measurement: Implications for Experimentally Determined Hydration Rates. American Antiquity 53: 110117.

C. M. Stevenson , W. Freeborn , and B. Scheetz 1987 Obsidian Hydration Dating: An Improved Optical Technique for Measuring the Width of the Hydration Rim. Archaeometry 29: 120123.

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American Antiquity
  • ISSN: 0002-7316
  • EISSN: 2325-5064
  • URL: /core/journals/american-antiquity
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