Photograph as originally submitted to this page
in the Historical Marker Database www.HMdb.org
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Photographer: Barry Swackhamer
Taken: July 1, 2014
Caption: Cambrian-Ordovician Boundary
Submitted: December 14, 2014, by Barry Swackhamer of Brentwood, California.
Database Locator Identification Number: p295252
File Size: 3.529 Megabytes
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