File:Dichotomosphinctes fossil ammonite (Upper Jurassic; Moronodova, western Madagascar) (15053940658).jpg
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Summary
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| Description |
Dichotomosphinctes sp. (a.k.a. Perisphinctes (Dichotomosphinctes) sp.) [ID correct?] (5.3 cm across) - commercial specimen attributed to the Oxfordian Stage (lower Upper Jurassic) of Moronodova, western Madagascar. Ammonites are common & conspicuous fossils in Mesozoic marine sedimentary rocks. Ammonites are an extinct group of cephalopods - they’re basically squids in coiled shells. The living chambered nautilus also has a squid-in-a-coiled-shell body plan, but ammonites are a different group. Ammonites get their name from the coiled shell shape being reminiscent of a ram’s horn. The ancient Egyptian god Amun (“Ammon” in Greek) was often depicted with a ram’s head & horns. Pliny’s Natural History, book 37, written in the 70s A.D., refers to these fossils as “Hammonis cornu” (the horn of Ammon), and mentions that people living in northeastern Africa perceived them as sacred. Pliny also indicates that ammonites were often pyritized. Classification: Animalia, Mollusca, Cephalopoda, Ammonoidea, Ammonitina |
| Date | |
| Source | Dichotomosphinctes fossil ammonite (Upper Jurassic; Moronodova, western Madagascar) |
| Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15053940658. It was reviewed on 6 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
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