SMALL PRECIOUS GEM AMMONITE. ...

Description

SMALL PRECIOUS GEM AMMONITE
Placenticeras intercalare
Cretaceous
Bearpaw Formation, Southern Alberta, Canada
Ammonites are amongst the most copious and easily recognized of fossils, but those found in the small Bearpaw formation in the northern United States and southern Canada represent some of the rarest of all fossils for the presence of the rarest of the world's gemstones, ammolite. The conditions of fossilization geomorphously transform the shell's aragonite lining with trace impurities and create the shimmering canvas of colors seen here. Most specimens are crushed almost flat, but this lovely little example retains good three-dimensionality, particularly attractive in the P. intercalare with its distinctively ribbed shell. A fine little specimen with flashes of green and gold and a lovely deep red, it measures 4 1/8 inches wide.

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