File:Vascoceras sp. (fossil ammonite) (Upper Cretaceous; Gombe region, Nigeria) 1 (30848115027).jpg

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Vascoceras sp. - ammonite fossil (internal mold) in fossiliferous limestone from the Cretaceous of Nigeria, Africa. (~8.9 centimeters across)

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, Ammonitida, Vascoceratidae

Stratigraphy: unrecorded Upper Cretaceous unit (possibly the Pindiga Formation)

Locality: unrecorded/undisclosed site in the Gombe region, northeastern Nigeria, western Africa
Date
Source Vascoceras sp. (fossil ammonite) (Upper Cretaceous; Gombe region, Nigeria) 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@N05/30848115027 (archive). It was reviewed on 1 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

1 December 2019

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current09:08, 1 December 2019Thumbnail for version as of 09:08, 1 December 20193,045 × 2,315 (5.34 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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