A smattering of #Silurian bivalve internal molds in iron-rich siltstone - Ctenodonta machaeriformis (ROM7266, Hamilton, ON) #MolluscMonday http://pic.twitter.com/TS5rMpaF6A
— Dave Rudkin (@RudkinDave) July 3, 2017
via Twitter https://twitter.com/RudkinDave
July 03, 2017 at 05:42PM
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