ANTH 9 Lecture Notes - Lecture 32: Volcanic Glass, Geochronology, Tephra
31 Aug 2020
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Document Summary
Changes in object attributes (design, style) over time. These are usually stylistic attributes rather that functional attributed. E. g. paint color, chrome versus v-6 motor. The width of the curves represents the relative frequency or abundance of each bottle type during a given time interval. When an object of known age occurs in another region then the second context is assumed to be of the same age. Artifacts within soil layers can be arranged in time. Must assess how layers were formed natural (wash in) and cultural events: When the age of geological events and human activities coincide: e. g. sea level/shoreline changes (drops, e. g. volcanic tephra (glass) or ash deposits. Water diffuses into glass at a constant rate. Thicker the layer, the older the volcanic glass artifact. Counts the growth cycles (tree-rings) of trees to determine the age at death (cutting date) Many trees of different ages are used to construct a long-term sequence.
