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45WT41 Slides008 " data-medium-file="https://s3wsu.edu/uploads/sites/1883/2018/05/45WT41-Slides008-396x260.jpg" data-large-file="https://s3wsu.edu/uploads/sites/1883/2018/05/45WT41-Slides008.jpg" / 45WT41 Slides110 " data-medium-file="https://s3wsu.edu/uploads/sites/1883/2018/05/45WT41-Slides110-396x260.jpg" data-large-file="https://s3wsu.edu/uploads/sites/1883/2018/05/45WT41-Slides110.jpg" / Granite Point Modern_small " data-medium-file="https://s3wsu.edu/uploads/sites/1883/2018/05/Granite Point Modern_small-396x257.jpg" data-large-file="https://s3wsu.edu/uploads/sites/1883/2018/05/Granite Point Modern_small-792x515.jpg" /Granite Point Locality 1 (45WT41) is a prehistoric site that was situated along the Lower Snake River.The planned damming of the Snake River threatened archaeological sites located along the river’s edge leading the Army Corps of Engineers to contract salvage excavations at Granite Point and several other endangered archaeological sites. These excavations uncovered the site’s long history of occupation and revealed a record of 10,000 years of cultural change which made Granite Point an important component to building a cultural chronology of the Lower Snake River Region.
Probably a better description, and that most often used for Obsidian, is a that it is a naturally occurring form of glass.Rhyolite typically cools more rapidly near the earth's surface and contains smaller mineral crystals than granite.When rhyolite magma approaches the earth's surface and the pressure decreases, most of the water in the magma is lost as steam.The process can be sped up in the presence of water.This also means that Obsidian is only found in relatively modern areas, and in none older than the Cretaceous age (from 135 million to 63 million years ago).
The excavation of Granite Point was contracted to Washington State University and fieldwork was conducted during the summers of 19 by Washington State University faculty and field school students. The completion of dams along the Snake River flooded Granite Point Locality 1, and though the physical locality is inaccessible, the river’s waters do not prohibit its continued study.