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The Gregory Creek source, first briefly reported by Sappington (1981a), is spread over an area of several square miles in the vicinity of Indian Creek and Gregory Creek. The source has also been known as the Jonesboro source and is almost certainly the same as the one identified as the Sugarloaf Butte source by Nelson (1984). Artifacts correlated with the Gregory Creek source are known primarily from sites located in the Malheur National Forest and Upper John Day Basin and from sites located along Oregon Highway 20 in the Jonesboro area. This source was initially named the Jonesboro source by Skinner and Thatcher (1998) because of the large proportion of Gregory Creek obsidian that was identified at sites along Oregon Highway 20 in the Jonesboro area.
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