Trilobites to Tertiary Topaz

Many thanks to Stephen Mayer for writing this collecting trip note for the August WCGMC newsletter and also for allowing me to post it my blog.

By Stephen Mayer

Tammy and I are back from a vacation in the desert southwest.  Naturally, we took some time between visits to National Parks to do a little fossil and mineral collecting in Utah.  The setting and geology are quite different than in western New York.

Very thick shale and calcareous mudstones are widespread in Millard County, west-central Utah and contain some of the best Cambrian biotas in the world.  Not only are there 505-520 million year old fossils abundant, but also recent volcanism in the same region has left its mark with abundant rocks and minerals.  Specifically, well preserved trilobites and beautiful topaz crystals can be collected.

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