Exempel på obsidian

• In other words, as the rate of import increases, the proportion of the obsidian assemblage that is green decreases.

• The obsidian cobbles are easily detached from their parent rock by water erosion and carried downstream.

• The former were possibly the same individuals who exchanged the green obsidian to small centers and then to small sites.

• Unworked and worked shell ornaments, shell "trumpets," and several clusters of obsidian projectile points were distributed following symmetrical patterns, mainly along the periphery.

• The majority of the skull burials contain fewer than three objects, and only three of the 11 contexts contain obsidian.

• Not smooth but rather marred by dense, small pockmarks; its par ticulate inclusions are finer and denser than those of any other obsidian sources.

• Table 3 shows the quantities of transparent green obsidian versus graystriated, clear gray, and black obsidian found at each of the three frontier sites.

• The inclusion of more information on the other techniques that are applicable to obsidian studies would have been very useful.

• Both of these city-states provide evidence of specialized production, exchange, and consumption of obsidian tools.

• For obsidian, sampling and analyzing all sources is a realistic goal.

• Aspects of social organization are addressed through the obsidian data, as are some insights into tool production and by whom.

• All components of the rock, except the obsidian cobbles, are susceptible to weathering and are easily transformed into clay, as the matrix is quite porous.

• City-states in the agricultural periphery and those with regionally restricted raw materials such as obsidian had a greater emphasis on non-subsistence craft production.

• Earlier work using obsidian hydration dating is now questioned on methodological grounds.

• Obsidian hydration dates were obtained from samples taken from 13 of the tombs, using methods current in the late 1970s.