File:Katroliceras matsumotoi (fossil ammonite) (Late Jurassic; Madagascar) 1 (46625534322).jpg

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Katroliceras matsumotoi (Larson, 2010) - fossil ammonite from the Jurassic of Madagascar. (6.0 centimeters tall)

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

Stratigraphy: unrecorded/undisclosed unit in the Kimmeridgian Stage of the Upper Jurassic

Locality: unrecorded/undisclosed site in southwestern Madagascar (possibly at or near Toliara)
Date
Source Katroliceras matsumotoi (fossil ammonite) (Late Jurassic; Madagascar) 1
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/46625534322 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

6 December 2019

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current04:03, 6 December 2019Thumbnail for version as of 04:03, 6 December 20192,410 × 2,396 (3.53 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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