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Showing results for tags 'Cleoniceras Ammonite'.
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One of my favourite fossils in my collection: a Cleoniceras sp. ammonite
gond posted a topic in Member Collections
This is one of my favourite fossils of my collection. Hope you like it too! ------------------------------------------------------------------------------- Species: Cleoniceras sp. Size: 6,6 cm x 5,3 cm x 1,9 cm Age: 145,5 mya (Lower Cretaceous) Origin: Tulear, Madagascar About the fossil: the beautiful red color of the shell and the more "white" one near the center of the specimen are a product of opalization (more specifically, the type of opal that formed in this specimen is red opal). Edit: It's not opal, it's aragonite.- 15 replies
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Two Iridescent Cleoniceras Cretaceous Ammonite fossils from Madagascar
xraymike79 posted a topic in Member Collections
Name: Cleoniceras besaiei Ammonite Time Period: Upper Early Cretaceous, Albian Stage Locality: Mahajanga Province, Madagascar This ammonite species is known as Cleoniceras, and the preservation is such that most of the original iridescent shell is preserved. The iridescence is a result of light passing through the layers of aragonite and conchiolin grown by the ammonite in life. The iridescence changes depending on the angle viewed by the observer and the type of light illuminating the shell.- 6 replies
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