Placenticeras costatum Upper Cretaceous Bearpaw Formation, Southern Alberta, Canada Prized by collectors, the 70 -75-million-year-old ammonite specimens from the Bearpaw Formation display a spectacular palette produced by light interference by the shell's layers. The flashing colors are produced not by opalization as is often thought, but by the ammonite's own mother-of-pearl layer which has been fossilized. The present fine specimen, displays red, orange, and green, which is highly desired by collectors. A spectacular piece, the luminous colors show in dramatic contrast to the deeply colored black shale. Measures 14 x 15in; specimen measures 8in
Placenticeras costatum Upper Cretaceous Bearpaw Formation, Southern Alberta, Canada Prized by collectors, the 70 -75-million-year-old ammonite specimens from the Bearpaw Formation display a spectacular palette produced by light interference by the shell's layers. The flashing colors are produced not by opalization as is often thought, but by the ammonite's own mother-of-pearl layer which has been fossilized. The present fine specimen, displays red, orange, and green, which is highly desired by collectors. A spectacular piece, the luminous colors show in dramatic contrast to the deeply colored black shale. Measures 14 x 15in; specimen measures 8in
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.jpg "Quelle: Christie's")
.jpg "Quelle: Christie's")
