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I-5 - SR 502 Projects
I-5 - SR 502 - Interchange - Complete October 2008
WSDOT Cultural Resources
Two different 3-D views of Feature 14, found in excavation unit TU-7
3-D imaging was used to model the distribution of the fire-modified rocks within excavation test units (labeled TU in the images shown here). The vertical and horizontal positions of each of the rocks were mapped in the field. Using this information, and measurements of the size of each rock, 3-D images of some of the cultural features were created. This allowed archaeologists to view the structure of the fire-modified rock features, aiding them in their interpretation of how ancient peoples built the features and the features' possible functions.
Photograph and 3-D models of fire-modified rock within excavation unit TU-4
In some cases, the distribution of the fire-modified rock during excavation seemed non-patterned or random, but 3-D modeling suggested otherwise. For example, Feature 17 (shown below) appeared as multiple pieces of fire-modified rock revealed during excavation of two 3x3-foot square excavation units (TU-2 and TU-3). The rocks did not appear grouped or patterned in any way until the digital modeling was performed. The modeling suggested that two rock features may have been encountered within the excavation units, shown below outlined in pink.
Three different views of the same excavation units, portrayed in 3-dimensional models
The information provided on this website is modified from the manuscript Archaeological Data Recovery for the I-5/SR 502 Interchange Project, by Michele Punke, Terry Ozbun, Jo Reese, and Brian Buchanan (2009). Archaeological Investigations Northwest, Inc. Report No. 2273. Prepared for Washington Department of Transportation Southwest Region, Vancouver, Washington.
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