ext_28735 ([identity profile] brdgt.livejournal.com) wrote in [personal profile] brdgt 2014-04-17 10:17 pm (UTC)

I just found them doing yardwork, so I doubt anyone was collecting them! They existed throughout the Paleozoic, not just the Cambrian. Since Utah was home to massive sea during the Cambrian, they are everywhere here.
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