Clay and CALCITE concretion North Fork of the Skykomish River, near Index, Snohomish County, Washington, USA Specimen in approximately 5.5 cm long Self-collected in 2004 Photo Copyright © 2004 Jeffrey M. Schwartz
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Clay and CALCITE concretion North Fork of the Skykomish River, near Index, Snohomish County, Washington, USA Specimen in approximately 5.5 cm long Self-collected in 2004 Photo Copyright © 2004 Jeffrey M. Schwartz
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