File:Diploscaphites sp. (fossil ammonite) (Fox Hills Formation, Upper Cretaceous, 74 Ma; Meade County, South Dakota, USA) 1 (33938521313).jpg
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_(Fox_Hills_Formation,_Upper_Cretaceous,_74_Ma;_Meade_County,_South_Dakota,_USA)_1_(33938521313).jpg&action=edit§ion=1){kind=link}
| Description |
Diploscaphites sp. - fossil ammonite from the Cretaceous of South Dakota, USA. 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. Ammonites typically have a planispirally coiled, calcareous shell. Sometimes, the nacreous aragonite ("mother-of-pearl") is still preserved, as with the example shown here. Classification: Animalia, Mollusca, Cephalopoda, Ammonoidea, Ammonitina Stratigraphy: Fox Hills Formation, Upper Cretaceous Locality: unrecorded/undisclosed site in Meade County, western South Dakota, USA |
| Date | |
| Source | Diploscaphites sp. (fossil ammonite) (Fox Hills Formation, Upper Cretaceous, 74 Ma; Meade County, South Dakota, USA) 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@N05/33938521313 (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. |
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| current | 09:02, 1 December 2019 | | 2,480 × 2,007 (3.08 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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