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Ammolite comes from the fossil shells of the Upper Cretaceous disk-shaped ammonites Placenticeras meeki and Placenticeras intercalare, and (to a lesser degree) the cylindrical baculite, Baculites compressus. Ammonites were cephalopods, that thrived in tropical seas until becoming extinct along with the dinosaurs at the end of the Mesozoic era.
Other fossils, such as many found in Madagascar and Alberta, Canada display iridescence. These iridescent ammonites are often of gem quality ( ammolite ) when polished. In no case would this iridescence have been visible during the animal's life; additional shell layers covered it.
A specimen of Placenticeras ammolite from the Bearpaw Formation. The Bearpaw Formation is famous for its well-preserved ammonite fossils. These include Placenticeras meeki , Placenticeras intercalare , Hoploscaphites , and Sphenodiscus , the baculite Baculites compressus and the bivalve Inoceramus , some of which are mined south-central Alberta ...
Ammolite is an iridescent gem stone made from the shells of fossil ammonites. A ... This internal mold fossil exhibits an ammonitic suture pattern.
Placenticeras sp. ammolite, Bearpaw Formation. At the Royal Tyrrell Museum of Palaeontology. Placenticeras has a very involute shell with slightly convex sides and a very narrow venter. Side are smooth or with faint sinuous ribs. Early whorls have umbilical tubercles that in later whorls appear higher on the sides.
A fossil cast of the shell of a Baculites grandis on display at the North American Museum of Ancient Life in Lehi, Utah. One notable feature about Baculites is that the males may have been a third to a half the size of the females and may have had much lighter ribbing on the surface of the shell.
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Hoplites is a genus of ammonite that lived from the Early Albian to the beginning of the Middle Albian. [2] Its fossils have been found in Europe, Transcaspia and Mexico.Shell has compressed, rectangular till depressed and trapezoidal whorl section.
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