UNITED STATES AND CANADA OBSIDIAN SOURCE CATALOG

Porphyritic obsidian from the Indian Rock source (AKA Unknown Variety A). The geologic location of this source, one which was occasionally identified in geochemically characterized artifact collections from southcentral Washington and northcentral Oregon, eluded archaeologists for many years. It was finally located by chance in 2004.

Washington Obsidian Sources

SOURCE NAME: Most commonly-used name for the geochemical source
OTHER NAMES: Alternate names or names of source outcrops belonging to same geochemical source group
Click on the PDF link for an Adobe Acrobat document with additional source information.

WASHINGTON SOURCE MAP | U.S. SOURCE MAPS INDEX

SOURCE NAME (CHEMICAL GROUP) OTHER NAME(S) PDF
Agnes Creek A Agnes Creek
--
Agnes Creek B Agnes Creek
--
Bickleton Ridge --
PDF
Chelan Butte --
PDF
Cleman Mountain Tachylyte Cleman Mountain
Manastash Ridge
Nasty Creek
Parke Creek
PDF
Copper Ridge Copper Ridge #1
Copper Ridge #3
Copper Ridge #4
Copper Ridge A
Copper Ridge B
Copper Ridge C
Copper Ridge D
PDF
Dollar Watch Pass --
--
Douglas Creek Tachylyte --
PDF
Elk Pass --
PDF
Hosko A Brooks
Brooks Park
Brooks Memorial State Park
PDF
Hosko B Brooks
Brooks Park
Brooks Memorial State Park
PDF
Indian Rock Unknown A
Unknown Variety A
--
Lake Corral --
--
Satus Creek --
--
Stray Gulch Tachylyte Stray Gulch
PDF
Yakima --
PDF

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Last Updated: 01/01/2026