CALCITE clay concretion North Fork of the Skykomish River, near Index, Snohomish County, Washington, USA Specimen in approximately 14.5 cm long Self-collected in 2000 Photo Copyright © 2002 Jeffrey M. Schwartz
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CALCITE clay concretion North Fork of the Skykomish River, near Index, Snohomish County, Washington, USA Specimen in approximately 14.5 cm long Self-collected in 2000 Photo Copyright © 2002 Jeffrey M. Schwartz
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