10.1" Spectacular Ammonite (Ammolite) With Mosasaur Bite Marks!

This is a truly spectacular ammonite fossil (Placenticeras meeki), collected from the Bearpaw Shale of Alberta, Canada (collected Fall, 2017). It's entirely preserved in brilliant ammolite, an iridescent, opal-like gemstone and features perforations (bite marks) left by a giant Mosasaur.

This remarkable ammonite fossil is in excellent condition with very vivid colors. It displays spectacularly and boasts bright colors throughout including burgundies, reds, oranges, golds, greens and even some rare blue and purple hues. There are bite marks visible from both sides which were left by a giant marine reptile (most likely a Mosasaur). This ammonite has many of the characteristics which have lead to these ammonites being considered previous and highly sought after.

These complete, ammolite preserved, ammonite fossils are rare. The Canadian government considers them part of the “National Treasures of Canada”. For this reason, all complete specimens must be inspected and registered by the Alberta provincial government. Each ammonite then receives a number and is entered in the provincial database. A cultural property export permit is required for them to be exported from the province. Documentation will be provided with the specimen.

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Ammolite is an opal-like gemstone found primarily in Alberta, Canada. It is made of the fossilized shells of ammonites, which in turn are composed primarily of aragonite, the same mineral contained in nacre, with a microstructure inherited from the shell. In 1981, ammolite was given official gemstone status by the World Jewellery Confederation (CIBJO)

An ammonite composed entirely of ammolite.  Complete specimens of this quality are rare and prices run into the tens or even hundreds of thousands of dollars.
An ammonite composed entirely of ammolite. Complete specimens of this quality are rare and prices run into the tens or even hundreds of thousands of dollars.

An iridescent opal-like play of color is shown in fine specimens, mostly in shades of green and red; all the spectral colors are possible, however. The iridescence is due to the microstructure of the aragonite: unlike most other gems, whose colors come from light absorption, the iridescent color of ammolite comes from interference with the light that rebounds from stacked layers of thin platelets that make up the aragonite. The thicker the layers, the more reds and greens are produced; the thinner the layers, the more blues and violets predominate. Reds and greens are the most commonly seen colors, owing to the greater fragility of the finer layers responsible for the blues.

Ammonites were predatory mollusks that resembled a squid with a shell. These cephalopods had eyes, tentacles, and spiral shells. They are more closely related to a living octopus, though the shells resemble that of a nautilus. True ammonites appeared in the fossil record about 240 million years ago. The last lineages disappeared 65 million years ago at the end of the Cretaceous.

Placenticeras meeki
Korite Ammolite Mine, SW Alberta, Canada
Bearpaw Formation
10.1 x 8.2 x 1.4"
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